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autoconf/lib/autoconf/libs.m4
Paul Eggert ef27f692a0 make update-copyright
2022-05-19 13:57:38 -07:00

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# This file is part of Autoconf. -*- Autoconf -*-
# Checking for libraries.
# Copyright (C) 1992-1996, 1998-2006, 2008-2017, 2020-2022 Free Software
# Foundation, Inc.
# This file is part of Autoconf. 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 3 of the License, 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.
#
# Under Section 7 of GPL version 3, you are granted additional
# permissions described in the Autoconf Configure Script Exception,
# version 3.0, as published by the Free Software Foundation.
#
# You should have received a copy of the GNU General Public License
# and a copy of the Autoconf Configure Script Exception along with
# this program; see the files COPYINGv3 and COPYING.EXCEPTION
# respectively. If not, see <https://www.gnu.org/licenses/>.
# 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. Generic tests for libraries
# 2. Tests for specific libraries
## --------------------------------- ##
## 1. Generic tests for libraries.## ##
## --------------------------------- ##
# AC_SEARCH_LIBS(FUNCTION, SEARCH-LIBS,
# [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
# [OTHER-LIBRARIES])
# --------------------------------------------------------
# Search for a library defining FUNC, if it's not already available.
AC_DEFUN([AC_SEARCH_LIBS],
[AS_VAR_PUSHDEF([ac_Search], [ac_cv_search_$1])dnl
AC_CACHE_CHECK([for library containing $1], [ac_Search],
[ac_func_search_save_LIBS=$LIBS
AC_LANG_CONFTEST([AC_LANG_CALL([], [$1])])
for ac_lib in '' $2
do
if test -z "$ac_lib"; then
ac_res="none required"
else
ac_res=-l$ac_lib
LIBS="-l$ac_lib $5 $ac_func_search_save_LIBS"
fi
AC_LINK_IFELSE([], [AS_VAR_SET([ac_Search], [$ac_res])])
AS_VAR_SET_IF([ac_Search], [break])
done
AS_VAR_SET_IF([ac_Search], , [AS_VAR_SET([ac_Search], [no])])
rm conftest.$ac_ext
LIBS=$ac_func_search_save_LIBS])
AS_VAR_COPY([ac_res], [ac_Search])
AS_IF([test "$ac_res" != no],
[test "$ac_res" = "none required" || LIBS="$ac_res $LIBS"
$3],
[$4])
AS_VAR_POPDEF([ac_Search])dnl
])
# AC_CHECK_LIB(LIBRARY, FUNCTION,
# [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
# [OTHER-LIBRARIES])
# ------------------------------------------------------
#
# Use a cache variable name containing both the library and function name,
# because the test really is for library $1 defining function $2, not
# just for library $1. Separate tests with the same $1 and different $2s
# may have different results.
#
# Note that using directly AS_VAR_PUSHDEF([ac_Lib], [ac_cv_lib_$1_$2])
# is asking for troubles, since AC_CHECK_LIB($lib, fun) would give
# ac_cv_lib_$lib_fun, which is definitely not what was meant. Hence
# the AS_LITERAL_IF indirection.
#
# FIXME: This macro is extremely suspicious. It DEFINEs unconditionally,
# whatever the FUNCTION, in addition to not being a *S macro. Note
# that the cache does depend upon the function we are looking for.
#
# It is on purpose we used 'ac_check_lib_save_LIBS' and not just
# 'ac_save_LIBS': there are many macros which don't want to see 'LIBS'
# changed but still want to use AC_CHECK_LIB, so they save 'LIBS'.
# And 'ac_save_LIBS' is too tempting a name, so let's leave them some
# freedom.
AC_DEFUN([AC_CHECK_LIB],
[m4_ifval([$3], , [AH_CHECK_LIB([$1])])dnl
AS_LITERAL_WORD_IF([$1],
[AS_VAR_PUSHDEF([ac_Lib], [ac_cv_lib_$1_$2])],
[AS_VAR_PUSHDEF([ac_Lib], [ac_cv_lib_$1""_$2])])dnl
AC_CACHE_CHECK([for $2 in -l$1], [ac_Lib],
[ac_check_lib_save_LIBS=$LIBS
LIBS="-l$1 $5 $LIBS"
AC_LINK_IFELSE([AC_LANG_CALL([], [$2])],
[AS_VAR_SET([ac_Lib], [yes])],
[AS_VAR_SET([ac_Lib], [no])])
LIBS=$ac_check_lib_save_LIBS])
AS_VAR_IF([ac_Lib], [yes],
[m4_default([$3], [AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_LIB$1))
LIBS="-l$1 $LIBS"
])],
[$4])
AS_VAR_POPDEF([ac_Lib])dnl
])# AC_CHECK_LIB
# AH_CHECK_LIB(LIBNAME)
# ---------------------
m4_define([AH_CHECK_LIB],
[AH_TEMPLATE(AS_TR_CPP([HAVE_LIB$1]),
[Define to 1 if you have the '$1' library (-l$1).])])
# AC_HAVE_LIBRARY(LIBRARY,
# [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
# [OTHER-LIBRARIES])
# ---------------------------------------------------------
#
# This macro is equivalent to calling 'AC_CHECK_LIB' with a FUNCTION
# argument of 'main'. In addition, LIBRARY can be written as any of
# 'foo', '-lfoo', or 'libfoo.a'. In all of those cases, the compiler
# is passed '-lfoo'. However, LIBRARY cannot be a shell variable;
# it must be a literal name.
AU_DEFUN([AC_HAVE_LIBRARY],
[m4_pushdef([AC_Lib_Name],
m4_bpatsubst(m4_bpatsubst([[$1]],
[lib\([^\.]*\)\.a], [\1]),
[-l], []))dnl
AC_CHECK_LIB(AC_Lib_Name, main, [$2], [$3], [$4])dnl
ac_cv_lib_[]AC_Lib_Name()=ac_cv_lib_[]AC_Lib_Name()_main
m4_popdef([AC_Lib_Name])dnl
])
## --------------------------------- ##
## 2. Tests for specific libraries. ##
## --------------------------------- ##
# --------------------- #
# Checks for X window. #
# --------------------- #
# _AC_PATH_X_XMKMF
# ----------------
# Internal subroutine of _AC_PATH_X.
# Set ac_x_includes and/or ac_x_libraries.
m4_define([_AC_PATH_X_XMKMF],
[AC_ARG_VAR(XMKMF, [Path to xmkmf, Makefile generator for X Window System])dnl
rm -f -r conftest.dir
if mkdir conftest.dir; then
cd conftest.dir
cat >Imakefile <<'_ACEOF'
incroot:
@echo incroot='${INCROOT}'
usrlibdir:
@echo usrlibdir='${USRLIBDIR}'
libdir:
@echo libdir='${LIBDIR}'
_ACEOF
if (export CC; ${XMKMF-xmkmf}) >/dev/null 2>/dev/null && test -f Makefile; then
# GNU make sometimes prints "make[1]: Entering ...", which would confuse us.
for ac_var in incroot usrlibdir libdir; do
eval "ac_im_$ac_var=\`\${MAKE-make} $ac_var 2>/dev/null | sed -n 's/^$ac_var=//p'\`"
done
# Open Windows xmkmf reportedly sets LIBDIR instead of USRLIBDIR.
for ac_extension in a so sl dylib la dll; do
if test ! -f "$ac_im_usrlibdir/libX11.$ac_extension" &&
test -f "$ac_im_libdir/libX11.$ac_extension"; then
ac_im_usrlibdir=$ac_im_libdir; break
fi
done
# Screen out bogus values from the imake configuration. They are
# bogus both because they are the default anyway, and because
# using them would break gcc on systems where it needs fixed includes.
case $ac_im_incroot in
/usr/include) ac_x_includes= ;;
*) test -f "$ac_im_incroot/X11/Xos.h" && ac_x_includes=$ac_im_incroot;;
esac
case $ac_im_usrlibdir in
/usr/lib | /usr/lib64 | /lib | /lib64) ;;
*) test -d "$ac_im_usrlibdir" && ac_x_libraries=$ac_im_usrlibdir ;;
esac
fi
cd ..
rm -f -r conftest.dir
fi
])# _AC_PATH_X_XMKMF
# _AC_PATH_X_DIRECT
# -----------------
# Internal subroutine of _AC_PATH_X.
# Set ac_x_includes and/or ac_x_libraries.
m4_define([_AC_PATH_X_DIRECT],
[# Standard set of common directories for X headers.
# Check X11 before X11Rn because it is often a symlink to the current release.
ac_x_header_dirs='
/usr/X11/include
/usr/X11R7/include
/usr/X11R6/include
/usr/X11R5/include
/usr/X11R4/include
/usr/include/X11
/usr/include/X11R7
/usr/include/X11R6
/usr/include/X11R5
/usr/include/X11R4
/usr/local/X11/include
/usr/local/X11R7/include
/usr/local/X11R6/include
/usr/local/X11R5/include
/usr/local/X11R4/include
/usr/local/include/X11
/usr/local/include/X11R7
/usr/local/include/X11R6
/usr/local/include/X11R5
/usr/local/include/X11R4
/opt/X11/include
/usr/X386/include
/usr/x386/include
/usr/XFree86/include/X11
/usr/include
/usr/local/include
/usr/unsupported/include
/usr/athena/include
/usr/local/x11r5/include
/usr/lpp/Xamples/include
/usr/openwin/include
/usr/openwin/share/include'
if test "$ac_x_includes" = no; then
# Guess where to find include files, by looking for Xlib.h.
# First, try using that file with no special directory specified.
AC_PREPROC_IFELSE([AC_LANG_SOURCE([@%:@include <X11/Xlib.h>])],
[# We can compile using X headers with no special include directory.
ac_x_includes=],
[for ac_dir in $ac_x_header_dirs; do
if test -r "$ac_dir/X11/Xlib.h"; then
ac_x_includes=$ac_dir
break
fi
done])
fi # $ac_x_includes = no
if test "$ac_x_libraries" = no; then
# Check for the libraries.
# See if we find them without any special options.
# Don't add to $LIBS permanently.
ac_save_LIBS=$LIBS
LIBS="-lX11 $LIBS"
AC_LINK_IFELSE([AC_LANG_PROGRAM([@%:@include <X11/Xlib.h>],
[XrmInitialize ()])],
[LIBS=$ac_save_LIBS
# We can link X programs with no special library path.
ac_x_libraries=],
[LIBS=$ac_save_LIBS
for ac_dir in `AS_ECHO(["$ac_x_includes $ac_x_header_dirs"]) | sed s/include/lib/g`
do
# Don't even attempt the hair of trying to link an X program!
for ac_extension in a so sl dylib la dll; do
if test -r "$ac_dir/libX11.$ac_extension"; then
ac_x_libraries=$ac_dir
break 2
fi
done
done])
fi # $ac_x_libraries = no
])# _AC_PATH_X_DIRECT
# _AC_PATH_X
# ----------
# Compute ac_cv_have_x.
AC_DEFUN([_AC_PATH_X],
[AC_REQUIRE([AC_PROG_CC])]dnl To ensure that $cross_compiling is finalized.
[AC_CACHE_VAL(ac_cv_have_x,
[# One or both of the vars are not set, and there is no cached value.
ac_x_includes=no
ac_x_libraries=no
# Do we need to do anything special at all?
ac_save_LIBS=$LIBS
LIBS="-lX11 $LIBS"
AC_LINK_IFELSE([AC_LANG_PROGRAM([@%:@include <X11/Xlib.h>],
[XrmInitialize ()])],
[# We can compile and link X programs with no special options.
ac_x_includes=
ac_x_libraries=])
LIBS="$ac_save_LIBS"
# If that didn't work, only try xmkmf and file system searches
# for native compilation.
AS_IF([test x"$ac_x_includes" = xno && test "$cross_compiling" = no],
[_AC_PATH_X_XMKMF
_AC_PATH_X_DIRECT])
# Record the results.
AS_CASE([$ac_x_includes,$ac_x_libraries],
[no,* | *,no | *\'*],
[# Didn't find X, or a directory has "'" in its name.
ac_cv_have_x="have_x=no"],
[# Record where we found X for the cache.
ac_cv_have_x="have_x=yes\
ac_x_includes='$ac_x_includes'\
ac_x_libraries='$ac_x_libraries'"])])])
# AC_PATH_X
# ---------
# If we find X, set shell vars x_includes and x_libraries to the
# paths, otherwise set no_x=yes.
# Uses ac_ vars as temps to allow command line to override cache and checks.
# --without-x overrides everything else, but does not touch the cache.
AN_HEADER([X11/Xlib.h], [AC_PATH_X])
AC_DEFUN([AC_PATH_X],
[dnl Document the X abnormal options inherited from history.
m4_divert_once([HELP_BEGIN], [
X features:
--x-includes=DIR X include files are in DIR
--x-libraries=DIR X library files are in DIR])dnl
AC_MSG_CHECKING([for X])
AC_ARG_WITH(x, [ --with-x use the X Window System])
# $have_x is 'yes', 'no', 'disabled', or empty when we do not yet know.
if test "x$with_x" = xno; then
# The user explicitly disabled X.
have_x=disabled
else
case $x_includes,$x_libraries in #(
*\'*) AC_MSG_ERROR([cannot use X directory names containing ']);; #(
*,NONE | NONE,*) _AC_PATH_X;; #(
*) have_x=yes;;
esac
eval "$ac_cv_have_x"
fi # $with_x != no
if test "$have_x" != yes; then
AC_MSG_RESULT([$have_x])
no_x=yes
else
# If each of the values was on the command line, it overrides each guess.
test "x$x_includes" = xNONE && x_includes=$ac_x_includes
test "x$x_libraries" = xNONE && x_libraries=$ac_x_libraries
# Update the cache value to reflect the command line values.
ac_cv_have_x="have_x=yes\
ac_x_includes='$x_includes'\
ac_x_libraries='$x_libraries'"
AC_MSG_RESULT([libraries $x_libraries, headers $x_includes])
fi
])# AC_PATH_X
# AC_PATH_XTRA
# ------------
# Find additional X libraries, magic flags, etc.
AC_DEFUN([AC_PATH_XTRA],
[AC_REQUIRE([AC_PATH_X])dnl
if test "$no_x" = yes; then
# Not all programs may use this symbol, but it does not hurt to define it.
AC_DEFINE([X_DISPLAY_MISSING], 1,
[Define to 1 if the X Window System is missing or not being used.])
X_CFLAGS= X_PRE_LIBS= X_LIBS= X_EXTRA_LIBS=
else
if test -n "$x_includes"; then
X_CFLAGS="$X_CFLAGS -I$x_includes"
fi
# It would also be nice to do this for all -L options, not just this one.
if test -n "$x_libraries"; then
X_LIBS="$X_LIBS -L$x_libraries"
# For Solaris; some versions of Sun CC require a space after -R and
# others require no space. Words are not sufficient . . . .
AC_MSG_CHECKING([whether -R must be followed by a space])
ac_xsave_LIBS=$LIBS; LIBS="$LIBS -R$x_libraries"
ac_xsave_[]_AC_LANG_ABBREV[]_werror_flag=$ac_[]_AC_LANG_ABBREV[]_werror_flag
ac_[]_AC_LANG_ABBREV[]_werror_flag=yes
AC_LINK_IFELSE([AC_LANG_PROGRAM()],
[AC_MSG_RESULT([no])
X_LIBS="$X_LIBS -R$x_libraries"],
[LIBS="$ac_xsave_LIBS -R $x_libraries"
AC_LINK_IFELSE([AC_LANG_PROGRAM()],
[AC_MSG_RESULT([yes])
X_LIBS="$X_LIBS -R $x_libraries"],
[AC_MSG_RESULT([neither works])])])
ac_[]_AC_LANG_ABBREV[]_werror_flag=$ac_xsave_[]_AC_LANG_ABBREV[]_werror_flag
LIBS=$ac_xsave_LIBS
fi
# Check for system-dependent libraries X programs must link with.
# Do this before checking for the system-independent R6 libraries
# (-lICE), since we may need -lsocket or whatever for X linking.
if test "$ISC" = yes; then
X_EXTRA_LIBS="$X_EXTRA_LIBS -lnsl_s -linet"
else
# Martyn Johnson says this is needed for Ultrix, if the X
# libraries were built with DECnet support. And Karl Berry says
# the Alpha needs dnet_stub (dnet does not exist).
ac_xsave_LIBS="$LIBS"; LIBS="$LIBS $X_LIBS -lX11"
AC_LINK_IFELSE([AC_LANG_CALL([], [XOpenDisplay])],
[],
[AC_CHECK_LIB(dnet, dnet_ntoa, [X_EXTRA_LIBS="$X_EXTRA_LIBS -ldnet"])
if test $ac_cv_lib_dnet_dnet_ntoa = no; then
AC_CHECK_LIB(dnet_stub, dnet_ntoa,
[X_EXTRA_LIBS="$X_EXTRA_LIBS -ldnet_stub"])
fi])
LIBS="$ac_xsave_LIBS"
# msh@cis.ufl.edu says -lnsl (and -lsocket) are needed for his 386/AT,
# to get the SysV transport functions.
# Chad R. Larson says the Pyramis MIS-ES running DC/OSx (SVR4)
# needs -lnsl.
# The nsl library prevents programs from opening the X display
# on Irix 5.2, according to T.E. Dickey.
# The functions gethostbyname, getservbyname, and inet_addr are
# in -lbsd on LynxOS 3.0.1/i386, according to Lars Hecking.
AC_CHECK_FUNC(gethostbyname)
if test $ac_cv_func_gethostbyname = no; then
AC_CHECK_LIB(nsl, gethostbyname, X_EXTRA_LIBS="$X_EXTRA_LIBS -lnsl")
if test $ac_cv_lib_nsl_gethostbyname = no; then
AC_CHECK_LIB(bsd, gethostbyname, X_EXTRA_LIBS="$X_EXTRA_LIBS -lbsd")
fi
fi
# lieder@skyler.mavd.honeywell.com says without -lsocket,
# socket/setsockopt and other routines are undefined under SCO ODT
# 2.0. But -lsocket is broken on IRIX 5.2 (and is not necessary
# on later versions), says Simon Leinen: it contains gethostby*
# variants that don't use the name server (or something). -lsocket
# must be given before -lnsl if both are needed. We assume that
# if connect needs -lnsl, so does gethostbyname.
AC_CHECK_FUNC(connect)
if test $ac_cv_func_connect = no; then
AC_CHECK_LIB(socket, connect, X_EXTRA_LIBS="-lsocket $X_EXTRA_LIBS", ,
$X_EXTRA_LIBS)
fi
# Guillermo Gomez says -lposix is necessary on A/UX.
AC_CHECK_FUNC(remove)
if test $ac_cv_func_remove = no; then
AC_CHECK_LIB(posix, remove, X_EXTRA_LIBS="$X_EXTRA_LIBS -lposix")
fi
# BSDI BSD/OS 2.1 needs -lipc for XOpenDisplay.
AC_CHECK_FUNC(shmat)
if test $ac_cv_func_shmat = no; then
AC_CHECK_LIB(ipc, shmat, X_EXTRA_LIBS="$X_EXTRA_LIBS -lipc")
fi
fi
# Check for libraries that X11R6 Xt/Xaw programs need.
ac_save_LDFLAGS=$LDFLAGS
test -n "$x_libraries" && LDFLAGS="$LDFLAGS -L$x_libraries"
# SM needs ICE to (dynamically) link under SunOS 4.x (so we have to
# check for ICE first), but we must link in the order -lSM -lICE or
# we get undefined symbols. So assume we have SM if we have ICE.
# These have to be linked with before -lX11, unlike the other
# libraries we check for below, so use a different variable.
# John Interrante, Karl Berry
AC_CHECK_LIB(ICE, IceConnectionNumber,
[X_PRE_LIBS="$X_PRE_LIBS -lSM -lICE"], , $X_EXTRA_LIBS)
LDFLAGS=$ac_save_LDFLAGS
fi
AC_SUBST(X_CFLAGS)dnl
AC_SUBST(X_PRE_LIBS)dnl
AC_SUBST(X_LIBS)dnl
AC_SUBST(X_EXTRA_LIBS)dnl
])# AC_PATH_XTRA
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