#							-*- Autotest -*-

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

# Copyright (C) 2000, 2001, 2003, 2005, 2006, 2007, 2008, 2009 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 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.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.


# 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([Erlang])
# Erlang C++ C C
AC_LANG_PUSH([Fortran 77])
# F77 Erlang C++ C C
AC_LANG_POP([Fortran 77])
# Erlang C++ C C
AC_LANG_POP([Erlang])
# 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
erl
f
erl
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])],
	      [estatus=$?
test $estatus != 2 &&
  AC_MSG_ERROR([did not get as 2 exit status: $estatus])])

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

]])

AT_CHECK_AUTOCONF
AT_CHECK_CONFIGURE([-q])

AT_CLEANUP

## --------------------------  ##
## Order of `rm' and actions.  ##
## --------------------------  ##

AT_SETUP([Order of user actions and cleanup])
AT_DATA([configure.ac],
[[AC_INIT
AC_PROG_CC

AC_PREPROC_IFELSE([AC_LANG_PROGRAM([int ok;], [])],
		  [test -f conftest.err || AS_EXIT([1])],
		  [AS_EXIT([1])])
AC_PREPROC_IFELSE([AC_LANG_PROGRAM([#define 12 34], [])],
		  [AS_EXIT([1])],
		  [test -f conftest.err || AS_EXIT([1])])

AC_COMPILE_IFELSE([AC_LANG_PROGRAM([int ok;], [])],
		  [test -f conftest.$ac_objext || AS_EXIT([1])],
		  [AS_EXIT([1])])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([int bad bad;], [])],
		  [AS_EXIT([1])],
		  [test -f conftest.err || AS_EXIT([1])])

AC_LINK_IFELSE([AC_LANG_PROGRAM([int ok;], [])],
	       [test -f conftest$ac_exeext || AS_EXIT([1])],
	       [AS_EXIT([1])])
AC_LINK_IFELSE([AC_LANG_PROGRAM([int bad bad;], [])],
	       [AS_EXIT([1])],
	       [test -f conftest.err || AS_EXIT([1])])

AC_RUN_IFELSE([AC_LANG_PROGRAM([int ok;], [])],
	      [./conftest$ac_exeext || AS_EXIT([1])],
	      [AS_EXIT([1])])

d@&t@nl conftest.err not generated by AC_RUN_IFELSE?
AC_RUN_IFELSE([AC_LANG_PROGRAM([int bad bad;], [])],
	      [AS_EXIT([1])],
	      [])
]])

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])])])

## -------------------- ##
## Multiple languages.  ##
## -------------------- ##

AT_SETUP([Multiple languages])

# This test should be skipped if the C compiler is a C++ compiler.
AT_DATA([configure.ac],
[[AC_INIT

AC_PROG_CC
AC_COMPILE_IFELSE([
  AC_LANG_PROGRAM([[
    #ifdef __cplusplus
    choke me
    #endif
  ]])], [], AS_EXIT([77]))
]])

AT_CHECK_AUTOCONF
AT_CHECK_CONFIGURE

# This test should be skipped on systems without a C++ compiler.
AT_DATA([configure.ac],
[[AC_INIT

AC_PROG_CXX
AC_LANG_PUSH([C++])
AC_COMPILE_IFELSE([
  AC_LANG_PROGRAM([[
    #ifndef __cplusplus
    choke me
    #endif
  ]])], [], AS_EXIT([77]))
AC_LANG_POP([C++])
]])

AT_CHECK_AUTOCONF
AT_CHECK_CONFIGURE

AT_DATA([configure.ac],
[[AC_INIT

AC_PROG_CC
AC_PROG_CXX

AC_LANG_PUSH([C])
AC_MSG_CHECKING([a simple C program that is not valid C++])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([enum a { A, B, C };
				    enum a f(enum a in) { return in++; }], [])],
		  [AC_MSG_RESULT([ok])],
		  [AC_MSG_RESULT([failed])
		   AC_MSG_ERROR([could not compile test program])])
AC_LANG_POP([C])

AC_LANG_PUSH([C++])
AC_MSG_CHECKING([a simple C++ program that is not valid C])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([class A {};], [])],
		  [AC_MSG_RESULT([ok])],
		  [AC_MSG_RESULT([failed])
		   AC_MSG_ERROR([could not compile test program])])

AC_CHECK_HEADER([cstring])
AC_LANG_POP([C++])
]])

AT_CHECK_AUTOCONF
AT_CHECK_CONFIGURE([-q])

AT_CLEANUP