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autoconf/aclang.m4
Akim Demaille 59ecd7666a * acgeneral.m4 (AC_VAR_INDIR_IFELSE): Move as... 
* m4sh.m4 (AS_LITERAL_IF): this.
(AS_IFELSE): Rename as...
(AS_IF): this.
2001-01-15 07:29:24 +00:00

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# This file is part of Autoconf. -*- Autoconf -*-
# Programming languages support.
# Copyright 2000
# Free Software Foundation, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
# 02111-1307, USA.
#
# As a special exception, the Free Software Foundation gives unlimited
# permission to copy, distribute and modify the configure scripts that
# are the output of Autoconf. You need not follow the terms of the GNU
# General Public License when using or distributing such scripts, even
# though portions of the text of Autoconf appear in them. The GNU
# General Public License (GPL) does govern all other use of the material
# that constitutes the Autoconf program.
#
# Certain portions of the Autoconf source text are designed to be copied
# (in certain cases, depending on the input) into the output of
# Autoconf. We call these the "data" portions. The rest of the Autoconf
# source text consists of comments plus executable code that decides which
# of the data portions to output in any given case. We call these
# comments and executable code the "non-data" portions. Autoconf never
# copies any of the non-data portions into its output.
#
# This special exception to the GPL applies to versions of Autoconf
# released by the Free Software Foundation. When you make and
# distribute a modified version of Autoconf, you may extend this special
# exception to the GPL to apply to your modified version as well, *unless*
# your modified version has the potential to copy into its output some
# of the text that was the non-data portion of the version that you started
# with. (In other words, unless your change moves or copies text from
# the non-data portions to the data portions.) If your modification has
# such potential, you must delete any notice of this special exception
# to the GPL from your modified version.
#
# Written by David MacKenzie, with help from
# Franc,ois Pinard, Karl Berry, Richard Pixley, Ian Lance Taylor,
# Roland McGrath, Noah Friedman, david d zuhn, and many others.
# Table of Contents:
#
# 1. Language selection
# and routines to produce programs in a given language.
# a. generic routines
# b. C
# c. C++
# d. Fortran 77
#
# 2. Producing programs in a given language.
# a. generic routines
# b. C
# c. C++
# d. Fortran 77
#
# 3. Looking for a compiler
# And possibly the associated preprocessor.
# a. Generic routines.
# b. C
# c. C++
# d. Fortran 77
#
# 4. Compilers' characteristics.
# a. Generic routines.
# b. C
# c. C++
# d. Fortran 77
## ----------------------- ##
## 1. Language selection. ##
## ----------------------- ##
# -------------------------------- #
# 1a. Generic language selection. #
# -------------------------------- #
# AC_LANG_CASE(LANG1, IF-LANG1, LANG2, IF-LANG2, ..., DEFAULT)
# ------------------------------------------------------------
# Expand into IF-LANG1 if the current language is LANG1 etc. else
# into default.
m4_define([AC_LANG_CASE],
[m4_case(_AC_LANG, $@)])
# _AC_LANG_DISPATCH(MACRO, LANG, ARGS)
# ------------------------------------
# Call the specialization of MACRO for LANG with ARGS. Complain if
# unavailable.
m4_define([_AC_LANG_DISPATCH],
[m4_ifdef([$1($2)],
[m4_indir([$1($2)], m4_shiftn(2, $@))],
[AC_FATAL([$1: unknown language: $2])])])
# AC_LANG(LANG)
# -------------
# Set the current language to LANG.
#
# Do *not* write AC_LANG([$1]), because this pair of parens does not
# correspond to an evaluation, rather, they are just part of the name.
# If you add quotes here, they will be part of the name too, yielding
# `AC_LANG([C])' for instance, which does not exist.
AC_DEFUN([AC_LANG],
[m4_if(m4_defn([_AC_LANG]), [$1], [],
[m4_define([_AC_LANG], [$1])dnl
_AC_LANG_DISPATCH([$0], _AC_LANG, $@)])])
# AC_LANG_PUSH(LANG)
# ------------------
# Save the current language, and use LANG.
m4_define([AC_LANG_PUSH],
[m4_pushdef([_AC_LANG], m4_defn([_AC_LANG]))dnl
AC_LANG([$1])])
# AC_LANG_POP
# -----------
# Restore the previous language.
m4_define([AC_LANG_POP],
[m4_popdef([_AC_LANG])dnl
m4_if(_AC_LANG, [_AC_LANG], [AC_FATAL([too many $0])])dnl
AC_LANG(_AC_LANG)])
# AC_LANG_SAVE
# ------------
# Save the current language, but don't change language.
AU_DEFUN([AC_LANG_SAVE],
[AC_DIAGNOSE([obsolete],
[instead of using `AC_LANG', `AC_LANG_SAVE',
and `AC_LANG_RESTORE', you should use `AC_LANG_PUSH' and `AC_LANG_POP'.])
m4_pushdef([_AC_LANG], _AC_LANG)])
# AC_LANG_RESTORE
# ---------------
# Restore the current language from the stack.
AU_DEFUN([AC_LANG_RESTORE], [AC_LANG_POP($@)])
# _AC_LANG_ABBREV
# ---------------
# Return a short signature of _AC_LANG which can be used in shell
# variable names, or in M4 macro names.
m4_define([_AC_LANG_ABBREV],
[_AC_LANG_DISPATCH([$0], _AC_LANG, $@)])
# AC_LANG_ASSERT(LANG)
# --------------------
# Current language must be LANG.
m4_define([AC_LANG_ASSERT],
[m4_if(_AC_LANG, $1, [],
[m4_fatal([$0: current language is not $1: ] _AC_LANG)])])
# -------------------- #
# 1b. The C language. #
# -------------------- #
# AC_LANG(C)
# ----------
# CFLAGS is not in ac_cpp because -g, -O, etc. are not valid cpp options.
m4_define([AC_LANG(C)],
[ac_ext=c
ac_cpp='$CPP $CPPFLAGS'
ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&AS_MESSAGE_LOG_FD'
ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&AS_MESSAGE_LOG_FD'
ac_compiler_gnu=$ac_cv_[]_AC_LANG_ABBREV[]_compiler_gnu
])
# AC_LANG_C
# ---------
AU_DEFUN([AC_LANG_C], [AC_LANG(C)])
# _AC_LANG_ABBREV(C)
# ------------------
m4_define([_AC_LANG_ABBREV(C)], [c])
# ---------------------- #
# 1c. The C++ language. #
# ---------------------- #
# AC_LANG(C++)
# ------------
# CXXFLAGS is not in ac_cpp because -g, -O, etc. are not valid cpp options.
m4_define([AC_LANG(C++)],
[ac_ext=cc
ac_cpp='$CXXCPP $CPPFLAGS'
ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&AS_MESSAGE_LOG_FD'
ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&AS_MESSAGE_LOG_FD'
ac_compiler_gnu=$ac_cv_[]_AC_LANG_ABBREV[]_compiler_gnu
])
# AC_LANG_CPLUSPLUS
# -----------------
AU_DEFUN([AC_LANG_CPLUSPLUS], [AC_LANG(C++)])
# _AC_LANG_ABBREV(C++)
# --------------------
m4_define([_AC_LANG_ABBREV(C++)], [cxx])
# ----------------------------- #
# 1d. The Fortran 77 language. #
# ----------------------------- #
# AC_LANG(Fortran 77)
# -------------------
m4_define([AC_LANG(Fortran 77)],
[ac_ext=f
ac_compile='$F77 -c $FFLAGS conftest.$ac_ext >&AS_MESSAGE_LOG_FD'
ac_link='$F77 -o conftest$ac_exeext $FFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&AS_MESSAGE_LOG_FD'
ac_compiler_gnu=$ac_cv_[]_AC_LANG_ABBREV[]_compiler_gnu
])
# AC_LANG_FORTRAN77
# -----------------
AU_DEFUN([AC_LANG_FORTRAN77], [AC_LANG(Fortran 77)])
# _AC_LANG_ABBREV(Fortran 77)
# ---------------------------
m4_define([_AC_LANG_ABBREV(Fortran 77)], [f77])
## ---------------------- ##
## 2.Producing programs. ##
## ---------------------- ##
# ---------------------- #
# 2a. Generic routines. #
# ---------------------- #
# AC_LANG_CONFTEST(BODY)
# ----------------------
# Save the BODY in `conftest.$ac_ext'. Add a trailing new line.
m4_define([AC_LANG_CONFTEST],
[cat >conftest.$ac_ext <<_ACEOF
$1
_ACEOF])
# AC_LANG_SOURCE(BODY)
# --------------------
# Produce a valid source for the current language, which includes the
# BODY, and as much as possible `confdefs.h' and the `#line' sync
# lines.
AC_DEFUN([AC_LANG_SOURCE],
[_AC_LANG_DISPATCH([$0], _AC_LANG, $@)])
# AC_LANG_PROGRAM([PROLOGUE], [BODY])
# -----------------------------------
# Produce a valid source for the current language. Prepend the
# PROLOGUE (typically CPP directives and/or declarations) to an
# execution the BODY (typically glued inside the `main' function, or
# equivalent).
AC_DEFUN([AC_LANG_PROGRAM],
[AC_LANG_SOURCE([_AC_LANG_DISPATCH([$0], _AC_LANG, $@)])])
# AC_LANG_CALL(PROLOGUE, FUNCTION)
# --------------------------------
# Call the FUNCTION.
AC_DEFUN([AC_LANG_CALL],
[_AC_LANG_DISPATCH([$0], _AC_LANG, $@)])
# AC_LANG_FUNC_LINK_TRY(FUNCTION)
# -------------------------------
# Produce a source which links correctly iff the FUNCTION exists.
AC_DEFUN([AC_LANG_FUNC_LINK_TRY],
[_AC_LANG_DISPATCH([$0], _AC_LANG, $@)])
# AC_LANG_BOOL_COMPILE_TRY(PROLOGUE, EXPRESSION)
# ----------------------------------------------
# Produce a program that compiles with success iff the boolean EXPRESSION
# evaluates to true at compile time.
AC_DEFUN([AC_LANG_BOOL_COMPILE_TRY],
[_AC_LANG_DISPATCH([$0], _AC_LANG, $@)])
# AC_LANG_INT_SAVE(PROLOGUE, EXPRESSION)
# --------------------------------------
# Produce a program that saves the runtime evaluation of the integer
# EXPRESSION into `conftestval'.
AC_DEFUN([AC_LANG_INT_SAVE],
[_AC_LANG_DISPATCH([$0], _AC_LANG, $@)])
# --------------- #
# 2b. C sources. #
# --------------- #
# AC_LANG_SOURCE(C)(BODY)
# -----------------------
# This sometimes fails to find confdefs.h, for some reason.
# #line __oline__ "$[0]"
m4_define([AC_LANG_SOURCE(C)],
[#line __oline__ "configure"
#include "confdefs.h"
$1])
# AC_LANG_PROGRAM(C)([PROLOGUE], [BODY])
# --------------------------------------
m4_define([AC_LANG_PROGRAM(C)],
[$1
int
main ()
{
dnl Do *not* indent the following line: there may be CPP directives.
dnl Don't move the `;' right after for the same reason.
$2
;
return 0;
}])
# AC_LANG_CALL(C)(PROLOGUE, FUNCTION)
# -----------------------------------
# Avoid conflicting decl of main.
m4_define([AC_LANG_CALL(C)],
[AC_LANG_PROGRAM([$1
m4_if([$2], [main], ,
[/* Override any gcc2 internal prototype to avoid an error. */
#ifdef __cplusplus
extern "C"
#endif
/* We use char because int might match the return type of a gcc2
builtin and then its argument prototype would still apply. */
char $2 ();])], [$2 ();])])
# AC_LANG_FUNC_LINK_TRY(C)(FUNCTION)
# ----------------------------------
# Don't include <ctype.h> because on OSF/1 3.0 it includes
# <sys/types.h> which includes <sys/select.h> which contains a
# prototype for select. Similarly for bzero.
m4_define([AC_LANG_FUNC_LINK_TRY(C)],
[AC_LANG_PROGRAM(
[/* System header to define __stub macros and hopefully few prototypes,
which can conflict with char $1 (); below. */
#include <assert.h>
/* Override any gcc2 internal prototype to avoid an error. */
#ifdef __cplusplus
extern "C"
#endif
/* We use char because int might match the return type of a gcc2
builtin and then its argument prototype would still apply. */
char $1 ();
char (*f) ();
],
[/* The GNU C library defines this for functions which it implements
to always fail with ENOSYS. Some functions are actually named
something starting with __ and the normal name is an alias. */
#if defined (__stub_$1) || defined (__stub___$1)
choke me
#else
f = $1;
#endif
])])
# AC_LANG_BOOL_COMPILE_TRY(C)(PROLOGUE, EXPRESSION)
# -------------------------------------------------
m4_define([AC_LANG_BOOL_COMPILE_TRY(C)],
[AC_LANG_PROGRAM([$1], [int _array_ @<:@1 - 2 * !($2)@:>@])])
# AC_LANG_INT_SAVE(C)(PROLOGUE, EXPRESSION)
# -----------------------------------------
# We need `stdio.h' to open a `FILE', so the prologue defaults to the
# inclusion of `stdio.h'.
m4_define([AC_LANG_INT_SAVE(C)],
[AC_LANG_PROGRAM([m4_default([$1], [@%:@include <stdio.h>])],
[FILE *f = fopen ("conftestval", "w");
if (!f)
exit (1);
fprintf (f, "%d", ($2));
fclose (f);])])
# ----------------- #
# 2c. C++ sources. #
# ----------------- #
# AC_LANG_SOURCE(C++)(BODY)
# -------------------------
m4_copy([AC_LANG_SOURCE(C)], [AC_LANG_SOURCE(C++)])
# AC_LANG_PROGRAM(C++)([PROLOGUE], [BODY])
# ----------------------------------------
m4_copy([AC_LANG_PROGRAM(C)], [AC_LANG_PROGRAM(C++)])
# AC_LANG_CALL(C++)(PROLOGUE, FUNCTION)
# -------------------------------------
m4_copy([AC_LANG_CALL(C)], [AC_LANG_CALL(C++)])
# AC_LANG_FUNC_LINK_TRY(C++)(FUNCTION)
# ------------------------------------
m4_copy([AC_LANG_FUNC_LINK_TRY(C)], [AC_LANG_FUNC_LINK_TRY(C++)])
# AC_LANG_BOOL_COMPILE_TRY(C++)(PROLOGUE, EXPRESSION)
# ---------------------------------------------------
m4_copy([AC_LANG_BOOL_COMPILE_TRY(C)], [AC_LANG_BOOL_COMPILE_TRY(C++)])
# AC_LANG_INT_SAVE(C++)(PROLOGUE, EXPRESSION)
# -------------------------------------------
m4_copy([AC_LANG_INT_SAVE(C)], [AC_LANG_INT_SAVE(C++)])
# ------------------------ #
# 2d. Fortran 77 sources. #
# ------------------------ #
# AC_LANG_SOURCE(Fortran 77)(BODY)
# --------------------------------
# FIXME: Apparently, according to former AC_TRY_COMPILER, the CPP
# directives must not be included. But AC_TRY_RUN_NATIVE was not
# avoiding them, so?
m4_define([AC_LANG_SOURCE(Fortran 77)],
[$1])
# AC_LANG_PROGRAM(Fortran 77)([PROLOGUE], [BODY])
# -----------------------------------------------
# Yes, we discard the PROLOGUE.
m4_define([AC_LANG_PROGRAM(Fortran 77)],
[m4_ifval([$1],
[m4_warn([syntax], [$0: ignoring PROLOGUE: $1])])dnl
program main
$2
end])
# AC_LANG_CALL(Fortran 77)(PROLOGUE, FUNCTION)
# --------------------------------------------
# FIXME: This is a guess, help!
m4_define([AC_LANG_CALL(Fortran 77)],
[AC_LANG_PROGRAM([$1],
[ call $2])])
## -------------------------------------------- ##
## 3. Looking for Compilers and Preprocessors. ##
## -------------------------------------------- ##
# ----------------------------------------------------- #
# 3a. Generic routines in compilers and preprocessors. #
# ----------------------------------------------------- #
# AC_LANG_COMPILER
# ----------------
# Find a compiler for the current LANG. Be sure to be run before
# AC_LANG_PREPROC.
#
# Note that because we might AC_REQUIRE `AC_LANG_COMPILER(C)' for
# instance, the latter must be AC_DEFUN'd, not just define'd.
m4_define([AC_LANG_COMPILER],
[AC_BEFORE([AC_LANG_COMPILER(]_AC_LANG[)],
[AC_LANG_PREPROC(]_AC_LANG[)])dnl
_AC_LANG_DISPATCH([$0], _AC_LANG, $@)])
# AC_LANG_COMPILER_REQUIRE
# ------------------------
# Ensure we have a compiler for the current LANG.
AC_DEFUN([AC_LANG_COMPILER_REQUIRE],
[m4_require([AC_LANG_COMPILER(]_AC_LANG[)],
[AC_LANG_COMPILER])])
# _AC_LANG_COMPILER_WORKS
# -----------------------
m4_define([_AC_LANG_COMPILER_WORKS],
[AC_MSG_CHECKING([whether the _AC_LANG compiler works])
_AC_LINK_IFELSE([AC_LANG_PROGRAM()],
[# FIXME: these cross compiler hacks should be removed for autoconf 3.0
# If not cross compiling, check that we can run a simple program.
if test "$cross_compiling" != yes; then
if AC_TRY_COMMAND(./conftest$ac_exeext); then
cross_compiling=no
else
if test "$cross_compiling" = maybe; then
cross_compiling=yes
else
AC_MSG_ERROR([cannot run _AC_LANG compiled programs.
To enable cross compilation, use `--host'.])
fi
fi
fi
AC_MSG_RESULT([yes])],
[AC_MSG_RESULT([no])
AC_MSG_ERROR([_AC_LANG compiler cannot create executables], 77)])
AC_MSG_CHECKING([whether we are cross compiling])
AC_MSG_RESULT([$cross_compiling])
])# _AC_LANG_COMPILER_WORKS
# _AC_LANG_COMPILER_GNU
# ---------------------
# Check whether the compiler for the current language is GNU.
#
# It doesn't seem necessary right now to have a different source
# according to the current language, since this works fine. Some day
# it might be needed. Nevertheless, pay attention to the fact that
# the position of `choke me' on the seventh column is meant: otherwise
# some Fortran compilers (e.g., SGI) might consider it's a
# continuation line, and warn instead of reporting an error.
m4_define([_AC_LANG_COMPILER_GNU],
[AC_CACHE_CHECK([whether we are using the GNU _AC_LANG compiler],
[ac_cv_[]_AC_LANG_ABBREV[]_compiler_gnu],
[_AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [[#ifndef __GNUC__
choke me
#endif
]])],
[ac_compiler_gnu=yes],
[ac_compiler_gnu=no])
ac_cv_[]_AC_LANG_ABBREV[]_compiler_gnu=$ac_compiler_gnu
])])# _AC_LANG_COMPILER_GNU
# AC_LANG_PREPROC
# ---------------
# Find a preprocessor for the current language. Note that because we
# might AC_REQUIRE `AC_LANG_PREPROC(C)' for instance, the latter must
# be AC_DEFUN'd, not just define'd. Since the preprocessor depends
# upon the compiler, look for the compiler.
m4_define([AC_LANG_PREPROC],
[AC_LANG_COMPILER_REQUIRE()dnl
_AC_LANG_DISPATCH([$0], _AC_LANG, $@)])
# AC_LANG_PREPROC_REQUIRE
# -----------------------
# Ensure we have a preprocessor for the current language.
AC_DEFUN([AC_LANG_PREPROC_REQUIRE],
[m4_require([AC_LANG_PREPROC(]_AC_LANG[)],
[AC_LANG_PREPROC])])
# AC_REQUIRE_CPP
# --------------
# Require the preprocessor for the current language.
# FIXME: AU_ALIAS once AC_LANG is officially documented (2.51?).
AC_DEFUN([AC_REQUIRE_CPP],
[AC_LANG_PREPROC_REQUIRE])
# AC_NO_EXECUTABLES
# -----------------
# FIXME: The GCC team has specific needs which the current Autoconf
# framework cannot solve elegantly. This macro implements a dirty
# hack until Autoconf is abble to provide the services its users
# needs.
#
# Several of the support libraries that are often built with GCC can't
# assume the tool-chain is already capable of linking a program: the
# compiler often expects to be able to link with some of such
# libraries.
#
# In several of these libraries, work-arounds have been introduced to
# avoid the AC_PROG_CC_WORKS test, that would just abort their
# configuration. The introduction of AC_EXEEXT, enabled either by
# libtool or by CVS autoconf, have just made matters worse.
AC_DEFUN_ONCE([AC_NO_EXECUTABLES],
[m4_divert_push([KILL])
AC_BEFORE([$0], [_AC_LANG_COMPILER_WORKS])
AC_BEFORE([$0], [_AC_COMPILER_EXEEXT])
m4_define([_AC_LANG_COMPILER_WORKS], [cross_compiling=maybe])
m4_define([_AC_COMPILER_EXEEXT], [EXEEXT=])
m4_define([AC_LINK_IFELSE],
[AC_FATAL([All the tests involving linking were disabled by $0])])
m4_divert_pop()dnl
])# # AC_NO_EXECUTABLES
# ----------------------------- #
# Computing EXEEXT and OBJEXT. #
# ----------------------------- #
# Files to ignore
# ---------------
# Ignore .d files produced by CFLAGS=-MD.
#
# On UWIN (which uses a cc wrapper for MSVC), the compiler also generates
# a .pdb file
#
# When the w32 free Borland C++ command line compiler links a program
# (conftest.exe), it also produces a file named `conftest.tds' in
# addition to `conftest.obj'
# We must not AU define them, because autoupdate would them remove
# them, which is right, but Automake 1.4 would remove the support for
# $(EXEEXT) etc.
# FIXME: Remove this once Automake fixed.
AC_DEFUN([AC_EXEEXT], [])
AC_DEFUN([AC_OBJEXT], [])
# _AC_COMPILER_EXEEXT_DEFAULT
# ---------------------------
# Check for the extension used for the default name for executables.
# Beware of `expr' that may return `0' or `'.
m4_define([_AC_COMPILER_EXEEXT_DEFAULT],
[# Try without -o first, disregard a.out.
ac_link_default=`echo "$ac_link" | sed ['s/ -o *conftest[^ ]*//']`
AS_IF([AC_TRY_EVAL(ac_link_default)],
[for ac_file in `ls a.exe conftest.exe a.* conftest conftest.* 2>/dev/null`; do
case $ac_file in
*.$ac_ext | *.out | *.o | *.obj | *.xcoff | *.tds | *.d | *.pdb ) ;;
*.* ) ac_cv_exeext=`expr "$ac_file" : ['[^.]*\(\..*\)']`
break;;
* ) break;;
esac
done],
[echo "$as_me: failed program was:" >&AS_MESSAGE_LOG_FD
cat conftest.$ac_ext >&AS_MESSAGE_LOG_FD])
rm -f a.out a.exe conftest$ac_cv_exeext
])# _AC_COMPILER_EXEEXT_DEFAULT
# _AC_COMPILER_EXEEXT_O
# ---------------------
# Check for the extension used when `-o foo'. Try to see if ac_cv_exeext,
# as computed by _AC_COMPILER_EXEEXT_DEFAULT is OK.
m4_define([_AC_COMPILER_EXEEXT_O],
[# We have not set ac_exeext yet which is needed by `ac_link'.
ac_exeext=$ac_cv_exeext
_AC_LINK_IFELSE([],
[# If both `conftest.exe' and `conftest' are `present' (well, observable)
# catch `conftest.exe'. For instance with Cygwin, `ls conftest' will
# work properly (i.e., refer to `conftest.exe'), while it won't with
# `rm'.
for ac_file in `(ls conftest.exe; ls conftest; ls conftest.*) 2>/dev/null`; do
case $ac_file in
*.$ac_ext | *.o | *.obj | *.xcoff | *.tds | *.d | *.pdb ) ;;
*.* ) ac_cv_exeext=`expr "$ac_file" : ['[^.]*\(\..*\)']`
break;;
* ) break;;
esac
done],
[AC_MSG_ERROR([cannot compute EXEEXT: cannot compile and link])])
rm -f conftest.$ac_ext conftest$ac_cv_exeext
])# _AC_COMPILER_EXEEXT_O
# _AC_COMPILER_EXEEXT
# -------------------
# Check for the extension used for executables. It compiles a test
# executable. If this is called, the executable extensions will be
# automatically used by link commands run by the configure script.
#
# Note that some compilers (cross or not), strictly obey to `-o foo' while
# the host requires `foo.exe', so we should not depend upon `-o' to
# test EXEEXT. But then, be sure no to destroy user files.
m4_define([_AC_COMPILER_EXEEXT],
[AC_CACHE_CHECK([for executable suffix], ac_cv_exeext,
[AC_LANG_CONFTEST([AC_LANG_PROGRAM()])
_AC_COMPILER_EXEEXT_DEFAULT
_AC_COMPILER_EXEEXT_O])
AC_SUBST([EXEEXT], [$ac_cv_exeext])dnl
ac_exeext=$EXEEXT
])# _AC_COMPILER_EXEEXT
# _AC_COMPILER_OBJEXT
# -------------------
# Check the object extension used by the compiler: typically `.o' or
# `.obj'. If this is called, some other behaviour will change,
# determined by ac_objext.
#
# This macro is called by AC_LANG_COMPILER, the latter being required
# by the AC_COMPILE_IFELSE macros, so use _AC_COMPILE_IFELSE. And in fact,
# don't, since _AC_COMPILE_IFELSE needs to know ac_objext for the `test -s'
# it includes. So do it by hand.
m4_define([_AC_COMPILER_OBJEXT],
[AC_CACHE_CHECK([for object suffix], ac_cv_objext,
[AC_LANG_CONFTEST([AC_LANG_PROGRAM()])
rm -f conftest.o conftest.obj
AS_IF([AC_TRY_EVAL(ac_compile)],
[for ac_file in `(ls conftest.o conftest.obj; ls conftest.*) 2>/dev/null`; do
case $ac_file in
*.$ac_ext | *.xcoff | *.tds | *.d | *.pdb ) ;;
*) ac_cv_objext=`expr "$ac_file" : '.*\.\(.*\)'`
break;;
esac
done],
[echo "$as_me: failed program was:" >&AS_MESSAGE_LOG_FD
cat conftest.$ac_ext >&AS_MESSAGE_LOG_FD
AC_MSG_ERROR([cannot compute OBJEXT: cannot compile])])
rm -f conftest.$ac_cv_objext conftest.$ac_ext])
AC_SUBST([OBJEXT], [$ac_cv_objext])dnl
ac_objext=$OBJEXT
])# _AC_COMPILER_OBJEXT
# -------------------- #
# 3b. The C compiler. #
# -------------------- #
# AC_LANG_PREPROC(C)
# -------------------
# Find the C preprocessor. Must be AC_DEFUN'd to be AC_REQUIRE'able.
AC_DEFUN([AC_LANG_PREPROC(C)],
[AC_REQUIRE([AC_PROG_CPP])])
# _AC_PROG_PREPROC_WORKS
# ----------------------
# Check if $ac_cpp is a working preprocessor that can flag absent
# includes either by the exit status or by warnings
# Set ac_cpp_err to a non-empty value if the preprocessor failed
# This macro is for all languages, not only C
AC_DEFUN([_AC_PROG_PREPROC_WORKS],
[# Use a header file that comes with gcc, so configuring glibc
# with a fresh cross-compiler works.
# On the NeXT, cc -E runs the code through the compiler's parser,
# not just through cpp. "Syntax error" is here to catch this case.
ac_[]_AC_LANG_ABBREV[]_preproc_warn_flag=maybe
_AC_PREPROC_IFELSE([AC_LANG_SOURCE([[@%:@include <assert.h>
Syntax error]])],
[# Now check whether non-existent headers can be detected and how
# Skip if ac_cpp_err is not empty - ac_cpp is broken
if test -z "$ac_cpp_err"; then
_AC_PREPROC_IFELSE([AC_LANG_SOURCE([[@%:@include <ac_nonexistent.h>]])],
[# cannot detect missing includes at all
ac_cpp_err=yes],
[if test "x$ac_cpp_err" = xmaybe; then
ac_[]_AC_LANG_ABBREV[]_preproc_warn_flag=yes
else
ac_[]_AC_LANG_ABBREV[]_preproc_warn_flag=
fi
ac_cpp_err=])
fi])])# _AC_PROG_PREPROC_WORKS
# AC_PROG_CPP
# -----------
# Find a working C preprocessor.
# We shouldn't have to require AC_PROG_CC, but this is due to the concurrency
# between the AC_LANG_COMPILER_REQUIRE family and that of AC_PROG_CC.
AC_DEFUN([AC_PROG_CPP],
[AC_REQUIRE([AC_PROG_CC])dnl
AC_LANG_PUSH(C)dnl
AC_MSG_CHECKING([how to run the C preprocessor])
# On Suns, sometimes $CPP names a directory.
if test -n "$CPP" && test -d "$CPP"; then
CPP=
fi
if test -z "$CPP"; then
AC_CACHE_VAL([ac_cv_prog_CPP],
[dnl
# Double quotes because CPP needs to be expanded
for CPP in "$CC -E" "$CC -E -traditional-cpp" "/lib/cpp"
do
_AC_PROG_PREPROC_WORKS()
if test -z "$ac_cpp_err"; then
break
fi
done
ac_cv_prog_CPP=$CPP
])dnl
CPP=$ac_cv_prog_CPP
else
_AC_PROG_PREPROC_WORKS()
ac_cv_prog_CPP=$CPP
fi
AC_MSG_RESULT([$CPP])
if test -n "$ac_cpp_err"; then
AC_MSG_ERROR([C preprocessor "$CPP" fails sanity check])
fi
AC_SUBST(CPP)dnl
AC_LANG_POP()dnl
])# AC_PROG_CPP
# AC_LANG_COMPILER(C)
# -------------------
# Find the C compiler. Must be AC_DEFUN'd to be AC_REQUIRE'able.
AC_DEFUN([AC_LANG_COMPILER(C)],
[AC_REQUIRE([AC_PROG_CC])])
# ac_cv_prog_gcc
# --------------
# We used to name the cache variable this way.
AU_DEFUN([ac_cv_prog_gcc],
[ac_cv_c_compiler_gnu])
# AC_PROG_CC([COMPILER ...])
# --------------------------
# COMPILER ... is a space separated list of C compilers to search for.
# This just gives the user an opportunity to specify an alternative
# search list for the C compiler.
AC_DEFUN([AC_PROG_CC],
[AC_LANG_PUSH(C)
AC_ARG_VAR([CC], [C compiler command])
AC_ARG_VAR([CFLAGS], [C compiler flags])
m4_ifval([$1],
[AC_CHECK_TOOLS(CC, [$1])],
[AC_CHECK_TOOL(CC, gcc)
if test -z "$CC"; then
AC_CHECK_TOOL(CC, cc)
fi
if test -z "$CC"; then
AC_CHECK_PROG(CC, cc, cc, , , /usr/ucb/cc)
fi
if test -z "$CC"; then
AC_CHECK_TOOLS(CC, cl)
fi
])
test -z "$CC" && AC_MSG_ERROR([no acceptable cc found in \$PATH])
_AC_LANG_COMPILER_WORKS
_AC_LANG_COMPILER_GNU
GCC=`test $ac_compiler_gnu = yes && echo yes`
AC_EXPAND_ONCE([_AC_COMPILER_OBJEXT])[]dnl
AC_EXPAND_ONCE([_AC_COMPILER_EXEEXT])[]dnl
_AC_PROG_CC_G
# Some people use a C++ compiler to compile C. Since we use `exit',
# in C++ we need to declare it. In case someone uses the same compiler
# for both compiling C and C++ we need to have the C++ compiler decide
# the declaration of exit, since it's the most demanding environment.
_AC_COMPILE_IFELSE([@%:@ifndef __cplusplus
choke me
@%:@endif],
[_AC_PROG_CXX_EXIT_DECLARATION])
AC_LANG_POP
])# AC_PROG_CC
# _AC_PROG_CC_G
# -------------
# Check whether -g works, even if CFLAGS is set, in case the package
# plays around with CFLAGS (such as to build both debugging and normal
# versions of a library), tasteless as that idea is.
m4_define([_AC_PROG_CC_G],
[ac_test_CFLAGS=${CFLAGS+set}
ac_save_CFLAGS=$CFLAGS
CFLAGS="-g"
AC_CACHE_CHECK(whether $CC accepts -g, ac_cv_prog_cc_g,
[_AC_COMPILE_IFELSE([AC_LANG_PROGRAM()], [ac_cv_prog_cc_g=yes],
[ac_cv_prog_cc_g=no])])
if test "$ac_test_CFLAGS" = set; then
CFLAGS=$ac_save_CFLAGS
elif test $ac_cv_prog_cc_g = yes; then
if test "$GCC" = yes; then
CFLAGS="-g -O2"
else
CFLAGS="-g"
fi
else
if test "$GCC" = yes; then
CFLAGS="-O2"
else
CFLAGS=
fi
fi[]dnl
])# _AC_PROG_CC_G
# AC_PROG_GCC_TRADITIONAL
# -----------------------
AC_DEFUN([AC_PROG_GCC_TRADITIONAL],
[if test $ac_cv_c_compiler_gnu = yes; then
AC_CACHE_CHECK(whether $CC needs -traditional,
ac_cv_prog_gcc_traditional,
[ ac_pattern="Autoconf.*'x'"
AC_EGREP_CPP($ac_pattern, [#include <sgtty.h>
Autoconf TIOCGETP],
ac_cv_prog_gcc_traditional=yes, ac_cv_prog_gcc_traditional=no)
if test $ac_cv_prog_gcc_traditional = no; then
AC_EGREP_CPP($ac_pattern, [#include <termio.h>
Autoconf TCGETA],
ac_cv_prog_gcc_traditional=yes)
fi])
if test $ac_cv_prog_gcc_traditional = yes; then
CC="$CC -traditional"
fi
fi
])# AC_PROG_GCC_TRADITIONAL
# AC_PROG_CC_C_O
# --------------
AC_DEFUN([AC_PROG_CC_C_O],
[AC_REQUIRE([AC_PROG_CC])dnl
if test "x$CC" != xcc; then
AC_MSG_CHECKING([whether $CC and cc understand -c and -o together])
else
AC_MSG_CHECKING([whether cc understands -c and -o together])
fi
set dummy $CC; ac_cc=`echo $[2] |
sed 's/[[^a-zA-Z0-9_]]/_/g;s/^[[0-9]]/_/'`
AC_CACHE_VAL(ac_cv_prog_cc_${ac_cc}_c_o,
[AC_LANG_CONFTEST([AC_LANG_PROGRAM([])])
# Make sure it works both with $CC and with simple cc.
# We do the test twice because some compilers refuse to overwrite an
# existing .o file with -o, though they will create one.
ac_try='$CC -c conftest.$ac_ext -o conftest.$ac_objext >&AS_MESSAGE_LOG_FD'
if AC_TRY_EVAL(ac_try) &&
test -f conftest.$ac_objext && AC_TRY_EVAL(ac_try);
then
eval ac_cv_prog_cc_${ac_cc}_c_o=yes
if test "x$CC" != xcc; then
# Test first that cc exists at all.
if AC_TRY_COMMAND(cc -c conftest.$ac_ext >&AS_MESSAGE_LOG_FD); then
ac_try='cc -c conftest.$ac_ext -o conftest.$ac_objext >&AS_MESSAGE_LOG_FD'
if AC_TRY_EVAL(ac_try) &&
test -f conftest.$ac_objext && AC_TRY_EVAL(ac_try);
then
# cc works too.
:
else
# cc exists but doesn't like -o.
eval ac_cv_prog_cc_${ac_cc}_c_o=no
fi
fi
fi
else
eval ac_cv_prog_cc_${ac_cc}_c_o=no
fi
rm -f conftest*
])dnl
if eval "test \"`echo '$ac_cv_prog_cc_'${ac_cc}_c_o`\" = yes"; then
AC_MSG_RESULT([yes])
else
AC_MSG_RESULT([no])
AC_DEFINE(NO_MINUS_C_MINUS_O, 1,
[Define if your C compiler doesn't accept -c and -o together.])
fi
])# AC_PROG_CC_C_O
# ---------------------- #
# 3c. The C++ compiler. #
# ---------------------- #
# AC_LANG_PREPROC(C++)
# ---------------------
# Find the C++ preprocessor. Must be AC_DEFUN'd to be AC_REQUIRE'able.
AC_DEFUN([AC_LANG_PREPROC(C++)],
[AC_REQUIRE([AC_PROG_CXXCPP])])
# AC_PROG_CXXCPP
# --------------
# Find a working C++ preprocessor.
# We shouldn't have to require AC_PROG_CC, but this is due to the concurrency
# between the AC_LANG_COMPILER_REQUIRE family and that of AC_PROG_CXX.
AC_DEFUN([AC_PROG_CXXCPP],
[AC_REQUIRE([AC_PROG_CXX])dnl
AC_LANG_PUSH(C++)dnl
AC_MSG_CHECKING([how to run the C++ preprocessor])
if test -z "$CXXCPP"; then
AC_CACHE_VAL(ac_cv_prog_CXXCPP,
[dnl
# Double quotes because CXXCPP needs to be expanded
for CXXCPP in "$CXX -E" "/lib/cpp"
do
_AC_PROG_PREPROC_WORKS()
if test -z "$ac_cpp_err"; then
break
fi
done
ac_cv_prog_CXXCPP=$CXXCPP
])dnl
CXXCPP=$ac_cv_prog_CXXCPP
else
_AC_PROG_PREPROC_WORKS()
ac_cv_prog_CXXCPP=$CXXCPP
fi
AC_MSG_RESULT([$CXXCPP])
if test -n "$ac_cpp_err"; then
AC_MSG_ERROR([C++ preprocessor "$CXXCPP" fails sanity check])
fi
AC_SUBST(CXXCPP)dnl
AC_LANG_POP()dnl
])# AC_PROG_CXXCPP
# AC_LANG_COMPILER(C++)
# ---------------------
# Find the C++ compiler. Must be AC_DEFUN'd to be AC_REQUIRE'able.
AC_DEFUN([AC_LANG_COMPILER(C++)],
[AC_REQUIRE([AC_PROG_CXX])])
# ac_cv_prog_gxx
# --------------
# We used to name the cache variable this way.
AU_DEFUN([ac_cv_prog_gxx],
[ac_cv_cxx_compiler_gnu])
# AC_PROG_CXX([LIST-OF-COMPILERS])
# --------------------------------
# LIST-OF-COMPILERS is a space separated list of C++ compilers to search
# for (if not specified, a default list is used). This just gives the
# user an opportunity to specify an alternative search list for the C++
# compiler.
# aCC HP-UX C++ compiler much better than `CC', so test before.
# KCC KAI C++ compiler
# RCC Rational C++
# xlC_r AIX C Set++ (with support for reentrant code)
# xlC AIX C Set++
AC_DEFUN([AC_PROG_CXX],
[AC_LANG_PUSH(C++)dnl
AC_ARG_VAR([CXX], [C++ compiler command])
AC_ARG_VAR([CXXFLAGS], [C++ compiler flags])
AC_CHECK_TOOLS(CXX,
[$CCC m4_default([$1],
[g++ c++ gpp aCC CC cxx cc++ cl KCC RCC xlC_r xlC])],
g++)
_AC_LANG_COMPILER_WORKS
_AC_LANG_COMPILER_GNU
GXX=`test $ac_compiler_gnu = yes && echo yes`
AC_EXPAND_ONCE([_AC_COMPILER_OBJEXT])[]dnl
AC_EXPAND_ONCE([_AC_COMPILER_EXEEXT])[]dnl
_AC_PROG_CXX_G
_AC_PROG_CXX_EXIT_DECLARATION
AC_LANG_POP
])# AC_PROG_CXX
# _AC_PROG_CXX_G
# --------------
# Check whether -g works, even if CXXFLAGS is set, in case the package
# plays around with CXXFLAGS (such as to build both debugging and
# normal versions of a library), tasteless as that idea is.
m4_define([_AC_PROG_CXX_G],
[ac_test_CXXFLAGS=${CXXFLAGS+set}
ac_save_CXXFLAGS=$CXXFLAGS
CXXFLAGS="-g"
AC_CACHE_CHECK(whether $CXX accepts -g, ac_cv_prog_cxx_g,
[_AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
[ac_cv_prog_cxx_g=yes],
[ac_cv_prog_cxx_g=no])])
if test "$ac_test_CXXFLAGS" = set; then
CXXFLAGS=$ac_save_CXXFLAGS
elif test $ac_cv_prog_cxx_g = yes; then
if test "$GXX" = yes; then
CXXFLAGS="-g -O2"
else
CXXFLAGS="-g"
fi
else
if test "$GXX" = yes; then
CXXFLAGS="-O2"
else
CXXFLAGS=
fi
fi[]dnl
])# _AC_PROG_CXX_G
# _AC_PROG_CXX_EXIT_DECLARATION
# -----------------------------
# Find a valid prototype for exit and declare it in confdefs.h.
m4_define([_AC_PROG_CXX_EXIT_DECLARATION],
[for ac_declaration in \
'extern "C" void std::exit (int) throw (); using std::exit;' \
'extern "C" void std::exit (int); using std::exit;' \
'extern "C" void exit (int) throw ();' \
'extern "C" void exit (int);' \
'void exit (int);' \
''
do
_AC_COMPILE_IFELSE([AC_LANG_PROGRAM([@%:@include <stdlib.h>
$ac_declaration],
[exit (42);])],
[],
[continue])
_AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$ac_declaration],
[exit (42);])],
[break])
done
echo '#ifdef __cplusplus' >>confdefs.h
echo $ac_declaration >>confdefs.h
echo '#endif' >>confdefs.h
])# _AC_PROG_CXX_EXIT_DECLARATION
# ----------------------------- #
# 3d. The Fortran 77 compiler. #
# ----------------------------- #
# AC_LANG_PREPROC(Fortran 77)
# ---------------------------
# Find the Fortran 77 preprocessor. Must be AC_DEFUN'd to be AC_REQUIRE'able.
AC_DEFUN([AC_LANG_PREPROC(Fortran 77)],
[m4_warn([syntax],
[$0: No preprocessor defined for ]_AC_LANG)])
# AC_LANG_COMPILER(Fortran 77)
# ----------------------------
# Find the Fortran 77 compiler. Must be AC_DEFUN'd to be
# AC_REQUIRE'able.
AC_DEFUN([AC_LANG_COMPILER(Fortran 77)],
[AC_REQUIRE([AC_PROG_F77])])
# ac_cv_prog_g77
# --------------
# We used to name the cache variable this way.
AU_DEFUN([ac_cv_prog_g77],
[ac_cv_f77_compiler_gnu])
# AC_PROG_F77([COMPILERS...])
# ---------------------------
# COMPILERS is a space separated list of Fortran 77 compilers to search
# for.
# Fortran 95 isn't strictly backwards-compatiable with Fortran 77, but
# `f95' is worth trying.
#
# Compilers are ordered by
# 1. F77, F90, F95
# 2. Good native compilers, bad native compilers, wrappers around f2c.
#
# `fort77' and `fc' are wrappers around `f2c', `fort77' being better.
# It is believed that under HP-UX `fort77' is the name of the native
# compiler. NAG f95 is preferred over `fc', so put `fc' last.
# pgf77 is the Portland Group f77 compiler.
# lf95 is the Lahey-Fujitsu compiler.
AC_DEFUN([AC_PROG_F77],
[AC_LANG_PUSH(Fortran 77)dnl
AC_ARG_VAR([F77], [Fortran 77 compiler command])
AC_ARG_VAR([FFLAGS], [Fortran 77 compiler flags])
AC_CHECK_TOOLS(F77,
[m4_default([$1],
[g77 f77 xlf cf77 pgf77 fl32 fort77 f90 xlf90 f95 lf95 pgf90 fc])])
_AC_LANG_COMPILER_WORKS
# If we don't use `.F' as extension, the preprocessor is not run on the
# input file.
ac_save_ext=$ac_ext
ac_ext=F
_AC_LANG_COMPILER_GNU
ac_ext=$ac_save_ext
G77=`test $ac_compiler_gnu = yes && echo yes`
AC_EXPAND_ONCE([_AC_COMPILER_OBJEXT])[]dnl
AC_EXPAND_ONCE([_AC_COMPILER_EXEEXT])[]dnl
_AC_PROG_F77_G
AC_LANG_POP
])# AC_PROG_F77
# _AC_PROG_F77_G
# --------------
# Check whether -g works, even if FFLAGS is set, in case the package
# plays around with FFLAGS (such as to build both debugging and normal
# versions of a library), tasteless as that idea is.
m4_define([_AC_PROG_F77_G],
[ac_test_FFLAGS=${FFLAGS+set}
ac_save_FFLAGS=$FFLAGS
FFLAGS=
AC_CACHE_CHECK(whether $F77 accepts -g, ac_cv_prog_f77_g,
[FFLAGS=-g
_AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
[ac_cv_prog_f77_g=yes],
[ac_cv_prog_f77_g=no])
])
if test "$ac_test_FFLAGS" = set; then
FFLAGS=$ac_save_FFLAGS
elif test $ac_cv_prog_f77_g = yes; then
if test "$G77" = yes; then
FFLAGS="-g -O2"
else
FFLAGS="-g"
fi
else
if test "$G77" = yes; then
FFLAGS="-O2"
else
FFLAGS=
fi
fi[]dnl
])# _AC_PROG_F77_G
# AC_PROG_F77_C_O
# ---------------
# Test if the Fortran 77 compiler accepts the options `-c' and `-o'
# simultaneously, and define `F77_NO_MINUS_C_MINUS_O' if it does not.
#
# The usefulness of this macro is questionable, as I can't really see
# why anyone would use it. The only reason I include it is for
# completeness, since a similar test exists for the C compiler.
AC_DEFUN([AC_PROG_F77_C_O],
[AC_REQUIRE([AC_PROG_F77])dnl
AC_CACHE_CHECK([whether $F77 understand -c and -o together],
[ac_cv_prog_f77_c_o],
[AC_LANG_CONFTEST([AC_LANG_PROGRAM([])])
# We do the `AC_TRY_EVAL' test twice because some compilers refuse to
# overwrite an existing `.o' file with `-o', although they will create
# one.
ac_try='$F77 $FFLAGS -c conftest.$ac_ext -o conftest.$ac_objext >&AS_MESSAGE_LOG_FD'
if AC_TRY_EVAL(ac_try) &&
test -f conftest.$ac_objext &&
AC_TRY_EVAL(ac_try); then
ac_cv_prog_f77_c_o=yes
else
ac_cv_prog_f77_c_o=no
fi
rm -f conftest*])
if test $ac_cv_prog_f77_c_o = yes; then
AC_DEFINE(F77_NO_MINUS_C_MINUS_O, 1,
[Define if your Fortran 77 compiler doesn't accept -c and -o together.])
fi
])# AC_PROG_F77_C_O
## ------------------------------- ##
## 4. Compilers' characteristics. ##
## ------------------------------- ##
# -------------------------------- #
# 4b. C compiler characteristics. #
# -------------------------------- #
# AC_PROG_CC_STDC
# ---------------
# If the C compiler in not in ANSI C mode by default, try to add an
# option to output variable @code{CC} to make it so. This macro tries
# various options that select ANSI C on some system or another. It
# considers the compiler to be in ANSI C mode if it handles function
# prototypes correctly.
AC_DEFUN([AC_PROG_CC_STDC],
[AC_REQUIRE([AC_PROG_CC])dnl
AC_BEFORE([$0], [AC_C_INLINE])dnl
AC_BEFORE([$0], [AC_C_CONST])dnl
dnl Force this before AC_PROG_CPP. Some cpp's, eg on HPUX, require
dnl a magic option to avoid problems with ANSI preprocessor commands
dnl like #elif.
dnl FIXME: can't do this because then AC_AIX won't work due to a
dnl circular dependency.
dnl AC_BEFORE([$0], [AC_PROG_CPP])
AC_MSG_CHECKING([for $CC option to accept ANSI C])
AC_CACHE_VAL(ac_cv_prog_cc_stdc,
[ac_cv_prog_cc_stdc=no
ac_save_CC=$CC
AC_LANG_CONFTEST([AC_LANG_PROGRAM(
[[#include <stdarg.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
/* Most of the following tests are stolen from RCS 5.7's src/conf.sh. */
struct buf { int x; };
FILE * (*rcsopen) (struct buf *, struct stat *, int);
static char *e (p, i)
char **p;
int i;
{
return p[i];
}
static char *f (char * (*g) (char **, int), char **p, ...)
{
char *s;
va_list v;
va_start (v,p);
s = g (p, va_arg (v,int));
va_end (v);
return s;
}
int test (int i, double x);
struct s1 {int (*f) (int a);};
struct s2 {int (*f) (double a);};
int pairnames (int, char **, FILE *(*)(struct buf *, struct stat *, int), int, int);
int argc;
char **argv;]],
[[return f (e, argv, 0) != argv[0] || f (e, argv, 1) != argv[1];]])])
# Don't try gcc -ansi; that turns off useful extensions and
# breaks some systems' header files.
# AIX -qlanglvl=ansi
# Ultrix and OSF/1 -std1
# HP-UX 10.20 and later -Ae
# HP-UX older versions -Aa -D_HPUX_SOURCE
# SVR4 -Xc -D__EXTENSIONS__
for ac_arg in "" -qlanglvl=ansi -std1 -Ae "-Aa -D_HPUX_SOURCE" "-Xc -D__EXTENSIONS__"
do
CC="$ac_save_CC $ac_arg"
AC_COMPILE_IFELSE([],
[ac_cv_prog_cc_stdc=$ac_arg
break])
done
rm -f conftest.$ac_ext conftest.$ac_objext
CC=$ac_save_CC
])
case "x$ac_cv_prog_cc_stdc" in
x|xno)
AC_MSG_RESULT([none needed]) ;;
*)
AC_MSG_RESULT([$ac_cv_prog_cc_stdc])
CC="$CC $ac_cv_prog_cc_stdc" ;;
esac
])# AC_PROG_CC_STDC
AC_DEFUN([AC_C_CROSS],
[AC_OBSOLETE([$0], [; it has been merged into AC_PROG_CC])])
# AC_C_CHAR_UNSIGNED
# ------------------
AC_DEFUN([AC_C_CHAR_UNSIGNED],
[AH_VERBATIM([__CHAR_UNSIGNED__],
[/* Define if type `char' is unsigned and you are not using gcc. */
#ifndef __CHAR_UNSIGNED__
# undef __CHAR_UNSIGNED__
#endif])dnl
AC_CACHE_CHECK(whether char is unsigned, ac_cv_c_char_unsigned,
[AC_COMPILE_IFELSE([AC_LANG_BOOL_COMPILE_TRY([AC_INCLUDES_DEFAULT([])],
[((char) -1) < 0])],
ac_cv_c_char_unsigned=no, ac_cv_c_char_unsigned=yes)])
if test $ac_cv_c_char_unsigned = yes && test "$GCC" != yes; then
AC_DEFINE(__CHAR_UNSIGNED__)
fi
])# AC_C_CHAR_UNSIGNED
# AC_C_LONG_DOUBLE
# ----------------
AC_DEFUN([AC_C_LONG_DOUBLE],
[AC_CACHE_CHECK(for long double, ac_cv_c_long_double,
[if test "$GCC" = yes; then
ac_cv_c_long_double=yes
else
AC_TRY_RUN(
[int
main ()
{
/* The Stardent Vistra knows sizeof(long double), but does not
support it. */
long double foo = 0.0;
/* On Ultrix 4.3 cc, long double is 4 and double is 8. */
exit (sizeof (long double) < sizeof (double));
}],
ac_cv_c_long_double=yes, ac_cv_c_long_double=no)
fi])
if test $ac_cv_c_long_double = yes; then
AC_DEFINE(HAVE_LONG_DOUBLE, 1,
[Define if the `long double' type works.])
fi
])# AC_C_LONG_DOUBLE
# AC_C_BIGENDIAN
# --------------
AC_DEFUN([AC_C_BIGENDIAN],
[AC_CACHE_CHECK(whether byte ordering is bigendian, ac_cv_c_bigendian,
[ac_cv_c_bigendian=unknown
# See if sys/param.h defines the BYTE_ORDER macro.
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <sys/types.h>
#include <sys/param.h>
],
[#if !BYTE_ORDER || !BIG_ENDIAN || !LITTLE_ENDIAN
bogus endian macros
#endif
])],
[# It does; now see whether it defined to BIG_ENDIAN or not.
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <sys/types.h>
#include <sys/param.h>
], [#if BYTE_ORDER != BIG_ENDIAN
not big endian
#endif
])], [ac_cv_c_bigendian=yes],
[ac_cv_c_bigendian=no])])
if test $ac_cv_c_bigendian = unknown; then
AC_TRY_RUN(
[int
main ()
{
/* Are we little or big endian? From Harbison&Steele. */
union
{
long l;
char c[sizeof (long)];
} u;
u.l = 1;
exit (u.c[sizeof (long) - 1] == 1);
}], ac_cv_c_bigendian=no, ac_cv_c_bigendian=yes)
fi])
if test $ac_cv_c_bigendian = yes; then
AC_DEFINE(WORDS_BIGENDIAN, 1,
[Define if your processor stores words with the most significant
byte first (like Motorola and SPARC, unlike Intel and VAX).])
fi
])# AC_C_BIGENDIAN
# AC_C_INLINE
# -----------
# Do nothing if the compiler accepts the inline keyword.
# Otherwise define inline to __inline__ or __inline if one of those work,
# otherwise define inline to be empty.
AC_DEFUN([AC_C_INLINE],
[AC_REQUIRE([AC_PROG_CC_STDC])dnl
AC_CACHE_CHECK([for inline], ac_cv_c_inline,
[ac_cv_c_inline=no
for ac_kw in inline __inline__ __inline; do
AC_COMPILE_IFELSE([AC_LANG_SOURCE(
[#ifndef __cplusplus
$ac_kw int foo () {return 0; }
#endif
])],
[ac_cv_c_inline=$ac_kw; break])
done
])
case $ac_cv_c_inline in
inline | yes) ;;
no) AC_DEFINE(inline,,
[Define as `__inline' if that's what the C compiler calls it,
or to nothing if it is not supported.]) ;;
*) AC_DEFINE_UNQUOTED(inline, $ac_cv_c_inline) ;;
esac
])# AC_C_INLINE
# AC_C_CONST
# ----------
AC_DEFUN([AC_C_CONST],
[AC_REQUIRE([AC_PROG_CC_STDC])dnl
AC_CACHE_CHECK([for an ANSI C-conforming const], ac_cv_c_const,
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],
[[/* FIXME: Include the comments suggested by Paul. */
#ifndef __cplusplus
/* Ultrix mips cc rejects this. */
typedef int charset[2];
const charset x;
/* SunOS 4.1.1 cc rejects this. */
char const *const *ccp;
char **p;
/* NEC SVR4.0.2 mips cc rejects this. */
struct point {int x, y;};
static struct point const zero = {0,0};
/* AIX XL C 1.02.0.0 rejects this.
It does not let you subtract one const X* pointer from another in
an arm of an if-expression whose if-part is not a constant
expression */
const char *g = "string";
ccp = &g + (g ? g-g : 0);
/* HPUX 7.0 cc rejects these. */
++ccp;
p = (char**) ccp;
ccp = (char const *const *) p;
{ /* SCO 3.2v4 cc rejects this. */
char *t;
char const *s = 0 ? (char *) 0 : (char const *) 0;
*t++ = 0;
}
{ /* Someone thinks the Sun supposedly-ANSI compiler will reject this. */
int x[] = {25, 17};
const int *foo = &x[0];
++foo;
}
{ /* Sun SC1.0 ANSI compiler rejects this -- but not the above. */
typedef const int *iptr;
iptr p = 0;
++p;
}
{ /* AIX XL C 1.02.0.0 rejects this saying
"k.c", line 2.27: 1506-025 (S) Operand must be a modifiable lvalue. */
struct s { int j; const int *ap[3]; };
struct s *b; b->j = 5;
}
{ /* ULTRIX-32 V3.1 (Rev 9) vcc rejects this */
const int foo = 10;
}
#endif
]])],
[ac_cv_c_const=yes],
[ac_cv_c_const=no])])
if test $ac_cv_c_const = no; then
AC_DEFINE(const,,
[Define to empty if `const' does not conform to ANSI C.])
fi
])# AC_C_CONST
# AC_C_VOLATILE
# -------------
# Note that, unlike const, #defining volatile to be the empty string can
# actually turn a correct program into an incorrect one, since removing
# uses of volatile actually grants the compiler permission to perform
# optimizations that could break the user's code. So, do not #define
# volatile away unless it is really necessary to allow the user's code
# to compile cleanly. Benign compiler failures should be tolerated.
AC_DEFUN([AC_C_VOLATILE],
[AC_REQUIRE([AC_PROG_CC_STDC])dnl
AC_CACHE_CHECK([for working volatile], ac_cv_c_volatile,
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [
volatile int x;
int * volatile y;])],
[ac_cv_c_volatile=yes],
[ac_cv_c_volatile=no])])
if test $ac_cv_c_volatile = no; then
AC_DEFINE(volatile,,
[Define to empty if the keyword `volatile' does not work.
Warning: valid code using `volatile' can become incorrect
without. Disable with care.])
fi
])# AC_C_VOLATILE
# AC_C_STRINGIZE
# --------------
# Checks if `#' can be used to glue strings together at the CPP level.
# Defines HAVE_STRINGIZE if positive.
AC_DEFUN([AC_C_STRINGIZE],
[AC_CACHE_CHECK([for preprocessor stringizing operator],
[ac_cv_c_stringize],
[AC_EGREP_CPP([@%:@teststring],
[@%:@define x(y) #y
char *s = x(teststring);],
[ac_cv_c_stringize=no],
[ac_cv_c_stringize=yes])])
if test $ac_cv_c_stringize = yes; then
AC_DEFINE(HAVE_STRINGIZE, 1,
[Define if cpp supports the ANSI @%:@ stringizing operator.])
fi
])# AC_C_STRINGIZE
# AC_C_PROTOTYPES
# ---------------
# Check if the C compiler supports prototypes, included if it needs
# options.
AC_DEFUN([AC_C_PROTOTYPES],
[AC_REQUIRE([AC_PROG_CC_STDC])dnl
AC_MSG_CHECKING([for function prototypes])
if test "$ac_cv_prog_cc_stdc" != no; then
AC_MSG_RESULT([yes])
AC_DEFINE(PROTOTYPES, 1,
[Define if the C compiler supports function prototypes.])
else
AC_MSG_RESULT([no])
fi
])# AC_C_PROTOTYPES
# ---------------------------------------- #
# 4d. Fortan 77 compiler characteristics. #
# ---------------------------------------- #
# _AC_PROG_F77_V_OUTPUT([FLAG = $ac_cv_prog_f77_v])
# -------------------------------------------------
# Link a trivial Fortran program, compiling with a verbose output FLAG
# (which default value, $ac_cv_prog_f77_v, is computed by
# _AC_PROG_F77_V), and return the output in $ac_f77_v_output. This
# output is processed in the way expected by AC_F77_LIBRARY_LDFLAGS,
# so that any link flags that are echoed by the compiler appear as
# space-separated items.
AC_DEFUN([_AC_PROG_F77_V_OUTPUT],
[AC_REQUIRE([AC_PROG_F77])dnl
AC_LANG_PUSH(Fortran 77)dnl
AC_LANG_CONFTEST([AC_LANG_PROGRAM([])])
# Compile and link our simple test program by passing a flag
# (argument 1 to this macro) to the Fortran 77 compiler in
# order to get "verbose" output that we can then parse for the
# Fortran 77 linker flags.
ac_save_FFLAGS=$FFLAGS
FFLAGS="$FFLAGS m4_default([$1], [$ac_cv_prog_f77_v])"
(eval echo $as_me:__oline__: \"$ac_link\") >&AS_MESSAGE_LOG_FD
ac_f77_v_output=`eval $ac_link AS_MESSAGE_LOG_FD>&1 2>&1 | grep -v 'Driving:'`
echo "$ac_f77_v_output" >&AS_MESSAGE_LOG_FD
FFLAGS=$ac_save_FFLAGS
rm -f conftest.*
AC_LANG_POP()dnl
# If we are using xlf then replace all the commas with spaces.
if echo $ac_f77_v_output | grep xlfentry >/dev/null 2>&1; then
ac_f77_v_output=`echo $ac_f77_v_output | sed 's/,/ /g'`
fi
# If we are using Cray Fortran then delete quotes.
# Use "\"" instead of '"' for font-lock-mode.
# FIXME: a more general fix for quoted arguments with spaces?
if echo $ac_f77_v_output | grep cft90 >/dev/null 2>&1; then
ac_f77_v_output=`echo $ac_f77_v_output | sed "s/\"//g"`
fi[]dnl
])# _AC_PROG_F77_V_OUTPUT
# _AC_PROG_F77_V
# --------------
#
# Determine the flag that causes the Fortran 77 compiler to print
# information of library and object files (normally -v)
# Needed for AC_F77_LIBRARY_FLAGS
# Some compilers don't accept -v (Lahey: -verbose, xlf: -V)
AC_DEFUN([_AC_PROG_F77_V],
[AC_CACHE_CHECK([how to get verbose linking output from $F77],
[ac_cv_prog_f77_v],
[AC_LANG_ASSERT(Fortran 77)
AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
[ac_cv_prog_f77_v=
# Try some options frequently used verbose output
for ac_verb in -v -verbose --verbose -V; do
_AC_PROG_F77_V_OUTPUT($ac_verb)
# look for -l* and *.a constructs in the output
for ac_arg in $ac_f77_v_output; do
case $ac_arg in
[[\\/]]*.a | ?:[[\\/]]*.a | -[[lLRu]]*)
ac_cv_prog_f77_v=$ac_verb
break 2 ;;
esac
done
done
if test -z "$ac_cv_prog_f77_v"; then
AC_MSG_WARN([cannot determine how to obtain linking information from $F77])
fi],
[AC_MSG_WARN([compilation failed])])
])])# _AC_PROG_F77_V
# AC_F77_LIBRARY_LDFLAGS
# ----------------------
#
# Determine the linker flags (e.g. "-L" and "-l") for the Fortran 77
# intrinsic and run-time libraries that are required to successfully
# link a Fortran 77 program or shared library. The output variable
# FLIBS is set to these flags.
#
# This macro is intended to be used in those situations when it is
# necessary to mix, e.g. C++ and Fortran 77, source code into a single
# program or shared library.
#
# For example, if object files from a C++ and Fortran 77 compiler must
# be linked together, then the C++ compiler/linker must be used for
# linking (since special C++-ish things need to happen at link time
# like calling global constructors, instantiating templates, enabling
# exception support, etc.).
#
# However, the Fortran 77 intrinsic and run-time libraries must be
# linked in as well, but the C++ compiler/linker doesn't know how to
# add these Fortran 77 libraries. Hence, the macro
# "AC_F77_LIBRARY_LDFLAGS" was created to determine these Fortran 77
# libraries.
#
# This macro was packaged in its current form by Matthew D. Langston.
# However, nearly all of this macro came from the "OCTAVE_FLIBS" macro
# in "octave-2.0.13/aclocal.m4", and full credit should go to John
# W. Eaton for writing this extremely useful macro. Thank you John.
AC_DEFUN([AC_F77_LIBRARY_LDFLAGS],
[AC_LANG_PUSH(Fortran 77)dnl
_AC_PROG_F77_V
AC_CACHE_CHECK([for Fortran 77 libraries], ac_cv_flibs,
[if test "x$FLIBS" != "x"; then
ac_cv_flibs="$FLIBS" # Let the user override the test.
else
_AC_PROG_F77_V_OUTPUT
ac_cv_flibs=
# Save positional arguments (if any)
ac_save_positional="$[@]"
set X $ac_f77_v_output
while test $[@%:@] != 1; do
shift
ac_arg=$[1]
case $ac_arg in
[[\\/]]*.a | ?:[[\\/]]*.a)
AC_LIST_MEMBER_OF($ac_arg, $ac_cv_flibs, ,
ac_cv_flibs="$ac_cv_flibs $ac_arg")
;;
-bI:*)
AC_LIST_MEMBER_OF($ac_arg, $ac_cv_flibs, ,
[AC_LINKER_OPTION([$ac_arg], ac_cv_flibs)])
;;
# Ignore these flags.
-lang* | -lcrt0.o | -lc | -lgcc | -LANG:=*)
;;
-lkernel32)
test x"$CYGWIN" != xyes && ac_cv_flibs="$ac_cv_flibs $ac_arg"
;;
-[[LRuY]])
# These flags, when seen by themselves, take an argument.
# We remove the space between option and argument and re-iterate
# unless we find an empty arg or a new option (starting with -)
case $[2] in
"" | -*);;
*)
ac_arg="$ac_arg$[2]"
shift; shift
set X $ac_arg "$[@]"
;;
esac
;;
-YP,*)
for ac_j in `echo $ac_arg | sed -e 's/-YP,/-L/;s/:/ -L/g'`; do
AC_LIST_MEMBER_OF($ac_j, $ac_cv_flibs, ,
[ac_arg="$ac_arg $ac_j"
ac_cv_flibs="$ac_cv_flibs $ac_j"])
done
;;
-[[lLR]]*)
AC_LIST_MEMBER_OF($ac_arg, $ac_cv_flibs, ,
ac_cv_flibs="$ac_cv_flibs $ac_arg")
;;
# Ignore everything else.
esac
done
# restore positional arguments
set X $ac_save_positional; shift
# We only consider "LD_RUN_PATH" on Solaris systems. If this is seen,
# then we insist that the "run path" must be an absolute path (i.e. it
# must begin with a "/").
case `(uname -sr) 2>/dev/null` in
"SunOS 5"*)
ac_ld_run_path=`echo $ac_f77_v_output |
sed -n 's,^.*LD_RUN_PATH *= *\(/[[^ ]]*\).*$,-R\1,p'`
test "x$ac_ld_run_path" != x &&
AC_LINKER_OPTION([$ac_ld_run_path], ac_cv_flibs)
;;
esac
fi # test "x$FLIBS" = "x"
])
FLIBS="$ac_cv_flibs"
AC_SUBST(FLIBS)
AC_LANG_POP()dnl
])# AC_F77_LIBRARY_LDFLAGS
# _AC_F77_NAME_MANGLING
# ---------------------
# Test for the name mangling scheme used by the Fortran 77 compiler.
#
# Sets ac_cv_f77_mangling. The value contains three fields, separated
# by commas:
#
# lower case / upper case:
# case translation of the Fortan 77 symbols
# underscore / no underscore:
# whether the compiler appends "_" to symbol names
# extra underscore / no extra underscore:
# whether the compiler appends an extra "_" to symbol names already
# containing at least one underscore
#
AC_DEFUN([_AC_F77_NAME_MANGLING],
[AC_REQUIRE([AC_F77_LIBRARY_LDFLAGS])dnl
AC_CACHE_CHECK([for Fortran 77 name-mangling scheme],
ac_cv_f77_mangling,
[AC_LANG_PUSH(Fortran 77)dnl
AC_COMPILE_IFELSE(
[ subroutine foobar()
return
end
subroutine foo_bar()
return
end],
[mv conftest.$ac_objext cf77_test.$ac_objext
AC_LANG_PUSH(C)dnl
ac_save_LIBS=$LIBS
LIBS="cf77_test.$ac_objext $FLIBS $LIBS"
ac_success=no
for ac_foobar in foobar FOOBAR; do
for ac_underscore in "" "_"; do
ac_func="$ac_foobar$ac_underscore"
AC_TRY_LINK_FUNC($ac_func,
[ac_success=yes; break 2])
done
done
if test "$ac_success" = "yes"; then
case $ac_foobar in
foobar)
ac_case=lower
ac_foo_bar=foo_bar
;;
FOOBAR)
ac_case=upper
ac_foo_bar=FOO_BAR
;;
esac
ac_success_extra=no
for ac_extra in "" "_"; do
ac_func="$ac_foo_bar$ac_underscore$ac_extra"
AC_TRY_LINK_FUNC($ac_func,
[ac_success_extra=yes; break])
done
if test "$ac_success_extra" = "yes"; then
ac_cv_f77_mangling="$ac_case case"
if test -z "$ac_underscore"; then
ac_cv_f77_mangling="$ac_cv_f77_mangling, no underscore"
else
ac_cv_f77_mangling="$ac_cv_f77_mangling, underscore"
fi
if test -z "$ac_extra"; then
ac_cv_f77_mangling="$ac_cv_f77_mangling, no extra underscore"
else
ac_cv_f77_mangling="$ac_cv_f77_mangling, extra underscore"
fi
else
ac_cv_f77_mangling="unknown"
fi
else
ac_cv_f77_mangling="unknown"
fi
LIBS=$ac_save_LIBS
AC_LANG_POP()dnl
rm -f cf77_test* conftest*])
AC_LANG_POP()dnl
])
])# _AC_F77_NAME_MANGLING
# The replacement is empty.
AU_DEFUN([AC_F77_NAME_MANGLING], [])
# AC_F77_WRAPPERS
# ---------------
# Defines C macros F77_FUNC(name,NAME) and F77_FUNC_(name,NAME) to
# properly mangle the names of C identifiers, and C identifiers with
# underscores, respectively, so that they match the name mangling
# scheme used by the Fortran 77 compiler.
AC_DEFUN([AC_F77_WRAPPERS],
[AC_REQUIRE([_AC_F77_NAME_MANGLING])dnl
AH_TEMPLATE([F77_FUNC],
[Define to a macro mangling the given C identifier (in lower and upper
case), which must not contain underscores, for linking with Fortran.])dnl
AH_TEMPLATE([F77_FUNC_],
[As F77_FUNC, but for C identifiers containing underscores.])dnl
case $ac_cv_f77_mangling in
"lower case, no underscore, no extra underscore")
AC_DEFINE([F77_FUNC(name,NAME)], [name])
AC_DEFINE([F77_FUNC_(name,NAME)], [name]) ;;
"lower case, no underscore, extra underscore")
AC_DEFINE([F77_FUNC(name,NAME)], [name])
AC_DEFINE([F77_FUNC_(name,NAME)], [name ## _]) ;;
"lower case, underscore, no extra underscore")
AC_DEFINE([F77_FUNC(name,NAME)], [name ## _])
AC_DEFINE([F77_FUNC_(name,NAME)], [name ## _]) ;;
"lower case, underscore, extra underscore")
AC_DEFINE([F77_FUNC(name,NAME)], [name ## _])
AC_DEFINE([F77_FUNC_(name,NAME)], [name ## __]) ;;
"upper case, no underscore, no extra underscore")
AC_DEFINE([F77_FUNC(name,NAME)], [NAME])
AC_DEFINE([F77_FUNC_(name,NAME)], [NAME]) ;;
"upper case, no underscore, extra underscore")
AC_DEFINE([F77_FUNC(name,NAME)], [NAME])
AC_DEFINE([F77_FUNC_(name,NAME)], [NAME ## _]) ;;
"upper case, underscore, no extra underscore")
AC_DEFINE([F77_FUNC(name,NAME)], [NAME ## _])
AC_DEFINE([F77_FUNC_(name,NAME)], [NAME ## _]) ;;
"upper case, underscore, extra underscore")
AC_DEFINE([F77_FUNC(name,NAME)], [NAME ## _])
AC_DEFINE([F77_FUNC_(name,NAME)], [NAME ## __]) ;;
*)
AC_MSG_WARN([unknown Fortran 77 name-mangling scheme])
;;
esac
])# AC_F77_WRAPPERS
# AC_F77_FUNC(NAME, [SHELLVAR = NAME])
# ------------------------------------
# For a Fortran subroutine of given NAME, define a shell variable
# $SHELLVAR to the Fortran-77 mangled name. If the SHELLVAR
# argument is not supplied, it defaults to NAME.
AC_DEFUN([AC_F77_FUNC],
[AC_REQUIRE([_AC_F77_NAME_MANGLING])dnl
case $ac_cv_f77_mangling in
upper*) ac_val="m4_toupper([$1])" ;;
lower*) ac_val="m4_tolower([$1])" ;;
*) ac_val="unknown" ;;
esac
case $ac_cv_f77_mangling in *," underscore"*) ac_val="$ac_val"_ ;; esac
m4_if(m4_index([$1],[_]),-1,[],
[case $ac_cv_f77_mangling in *," extra underscore"*) ac_val="$ac_val"_ ;; esac
])
m4_default([$2],[$1])="$ac_val"
])# AC_F77_FUNC
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