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dnl -*- shell-script -*-
dnl
dnl Copyright (c) 2006 Los Alamos National Security, LLC. All rights
dnl reserved.
dnl Copyright (c) 2010-2012 Cisco Systems, Inc. All rights reserved.
dnl $COPYRIGHT$
dnl
dnl Additional copyrights may follow
dnl
dnl $HEADER$
dnl
# OPAL_LANG_LINK_WITH_C(language)
# -------------------------------
# Try to link a small test program against a C object file to make
# sure the compiler for the given language is compatible with the C
# compiler.
AC_DEFUN([OPAL_LANG_LINK_WITH_C], [
AS_VAR_PUSHDEF([lang_var], [ompi_cv_c_link_$1])
AC_CACHE_CHECK([if C and $1 are link compatible],
lang_var,
[m4_if([$1], [Fortran],
[m4_define([ompi_lang_link_with_c_fortran], 1)
OMPI_FORTRAN_MAKE_C_FUNCTION([testfunc_name], [testfunc])],
[testfunc_name="testfunc"])
# Write out C part
AC_LANG_PUSH(C)
rm -f conftest_c.$ac_ext
cat > conftest_c.$ac_ext << EOF
int $testfunc_name(int a);
int $testfunc_name(int a) { return a; }
EOF
# Now compile both parts
OPAL_LOG_COMMAND([$CC -c $CFLAGS $CPPFLAGS conftest_c.$ac_ext],
[AC_LANG_PUSH($1)
ompi_lang_link_with_c_libs="$LIBS"
LIBS="conftest_c.o $LIBS"
m4_if(ompi_lang_link_with_c_fortran, 1,
[AC_LINK_IFELSE([AC_LANG_PROGRAM([], [
external testfunc
call testfunc(1)
])],
[AS_VAR_SET(lang_var, ["yes"])], [AS_VAR_SET(lang_var, ["no"])])],
[AC_LINK_IFELSE([AC_LANG_PROGRAM([
#if defined(c_plusplus) || defined(__cplusplus)
extern "C" int testfunc(int);
#else
extern int testfunc(int);
#endif
],
[return testfunc(0);])],
[AS_VAR_SET(lang_var, ["yes"])], [AS_VAR_SET(lang_var, ["no"])])])
LIBS="$ompi_lang_link_with_c_libs"
AC_LANG_POP($1)],
[AS_VAR_SET(lang_var, ["no"])])
rm -f conftest_c.$ac_ext
AC_LANG_POP(C)])
AS_VAR_IF(lang_var, [yes], [$2], [$3])
AS_VAR_POPDEF([lang_var])dnl
])
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