#							-*- Autotest -*-

AT_BANNER([Low level compiling/preprocessing macros.])

# Copyright (C) 2000, 2001, 2003, 2005, 2006 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., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.


# Since the macros which compile are required by most tests, check
# them first.  But remember that looking for a compiler is even more
# primitive, so check those first.


## ------------------------------------- ##
## AC_LANG, AC_LANG_PUSH & AC_LANG_POP.  ##
## ------------------------------------- ##

AT_SETUP([AC_LANG, AC_LANG_PUSH & AC_LANG_POP])

AT_DATA([configure.ac],
[[AC_INIT
# C
AC_LANG(C)
# C
AC_LANG_PUSH(C)
# C C
AC_LANG_PUSH(C++)
# C++ C C
AC_LANG(C++)
# C++ C C
AC_LANG_PUSH(Fortran 77)
# F77 C++ C C
AC_LANG_POP(Fortran 77)
# C++ C C
AC_LANG(C++)
# C++ C C
AC_LANG_POP(C++)
# C C
AC_LANG_POP(C)
# C
]])

AT_CHECK_AUTOCONF
AT_CHECK([sed -n 's/^ac_ext=//p' configure], 0,
[c
c
c
cpp
cpp
f
cpp
cpp
c
c
])

AT_CLEANUP


## ---------------------- ##
## AC_REQUIRE & AC_LANG.  ##
## ---------------------- ##

AT_SETUP([AC_REQUIRE & AC_LANG])

AT_DATA([configure.ac],
[[AC_DEFUN([AC_F77_1],
[AC_LANG_PUSH([Fortran 77])
if test $ac_ext != f; then
  AC_MSG_ERROR([F77_1: current shell language is $ac_ext, expected Fortran])
fi
AC_LANG_POP
])


AC_DEFUN([AC_F77_2],
[AC_LANG_PUSH([Fortran 77])
AC_REQUIRE([AC_F77_1])
if test $ac_ext != f; then
  AC_MSG_ERROR([F77_2: current shell language is $ac_ext, expected Fortran])
fi
AC_LANG_POP
])

AC_INIT
AC_F77_2
AS_EXIT(0)
]])

AT_CHECK_AUTOCONF
AT_CHECK_CONFIGURE

AT_CLEANUP


## --------------- ##
## AC_RUN_IFELSE.  ##
## --------------- ##

AT_SETUP([AC_RUN_IFELSE])

AT_DATA([configure.ac],
[[AC_INIT

AC_RUN_IFELSE([AC_LANG_PROGRAM([], [return 0])],
	      [],
	      [AC_MSG_ERROR([saw `return 0' as a failure])])

AC_RUN_IFELSE([AC_LANG_PROGRAM([], [return 2])],
	      [AC_MSG_ERROR([saw `return 2' as a success])],
	      [status=$?
test $status != 2 &&
  AC_MSG_ERROR([did not get as 2 exit status: $status])])

# The old stinky one.
AC_TRY_RUN([int main () { return 3; }],
	   [AC_MSG_ERROR([saw `return 3' as a success])],
	   [status=$?
test $status != 3 &&
  AC_MSG_ERROR([did not get 3 as exit status: $status])])

]])

AT_CHECK_AUTOCONF
AT_CHECK_CONFIGURE([-q])

AT_CLEANUP

## ------------------ ##
## AC_TRY_LINK_FUNC.  ##
## ------------------ ##

AT_CHECK_MACRO([AC_TRY_LINK_FUNC],
[AC_TRY_LINK_FUNC(printf,,
		  [AC_MSG_ERROR([cannot find `printf'])])
AC_TRY_LINK_FUNC(Be_doomed_if_your_libc_has_a_function_named_like_this,
		 [AC_MSG_ERROR([found a nonexistent function])])])
