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openmpi/config/ompi_fortran_check_real16_c_equiv.m4

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dnl -*- shell-script -*-
dnl
dnl Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
dnl University Research and Technology
dnl Corporation. All rights reserved.
dnl Copyright (c) 2004-2005 The University of Tennessee and The University
dnl of Tennessee Research Foundation. All rights
dnl reserved.
dnl Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
dnl University of Stuttgart. All rights reserved.
dnl Copyright (c) 2004-2005 The Regents of the University of California.
dnl All rights reserved.
dnl Copyright (c) 2008-2016 Cisco Systems, Inc. All rights reserved.
dnl Copyright (c) 2012 Oracle and/or its affiliates. All rights reserved.
dnl Copyright (c) 2015 Research Organization for Information Science
dnl and Technology (RIST). All rights reserved.
dnl $COPYRIGHT$
dnl
dnl Additional copyrights may follow
dnl
dnl $HEADER$
dnl
# OMPI_FORTRAN_CHECK_REAL16_C_EQUIV
# ----------------------------------------------------
AC_DEFUN([OMPI_FORTRAN_CHECK_REAL16_C_EQUIV],[
unset happy
OPAL_VAR_SCOPE_PUSH([happy define_value msg CFLAGS_save])
AS_VAR_PUSHDEF([real16_matches_c_var], [ompi_cv_real16_c_equiv])
# We have to do this as a cache check for cross-compilation platforms
AC_CACHE_CHECK([for C type matching bit representation of REAL*16],
real16_matches_c_var,
[AS_IF([test "$OMPI_TRY_FORTRAN_BINDINGS" -gt "$OMPI_FORTRAN_NO_BINDINGS" && \
test "$OMPI_HAVE_FORTRAN_REAL16" = "1"],
[
# AC_CACHE_CHECK automatically does its own AC_MSG_CHECKING, so close it out
AC_MSG_RESULT([pending])
# First check the type that we found was the same length in C
AC_MSG_CHECKING([if $OMPI_FORTRAN_REAL16_C_TYPE == REAL*16])
OMPI_FORTRAN_CHECK_REAL16_EQUIV_TYPE([$OMPI_FORTRAN_REAL16_C_TYPE], [L])
# If that didn't work, see if we have a compiler-specific
# type that might work
AS_IF([test "$happy" = "no"],
[AC_MSG_RESULT([$happy])
# Intel compiler has a special type that should work
AS_IF([test "$opal_cv_c_compiler_vendor" = "intel"],
[AC_MSG_CHECKING([if intel compiler _Quad == REAL*16])
CFLAGS_save="$CFLAGS"
CFLAGS="$CFLAGS -Qoption,cpp,--extended_float_types"
OPAL_FLAGS_UNIQ([CFLAGS])
OMPI_FORTRAN_CHECK_REAL16_EQUIV_TYPE([_Quad], [q])
AS_IF([test "$happy" = "yes"],
[OMPI_FORTRAN_REAL16_C_TYPE="_Quad"
AC_MSG_RESULT([works!])],
[CFLAGS="$CFLAGS_save"
AC_MSG_RESULT([does not work])])
])
AS_IF([test "$opal_cv_c_compiler_vendor" = "gnu" && test "$ac_cv_type___float128" = "yes"],
[AC_MSG_CHECKING([if gnu compiler __float128 == REAL*16])
OPAL_FLAGS_UNIQ([CFLAGS])
OMPI_FORTRAN_CHECK_REAL16_EQUIV_TYPE([__float128], [q])
AS_IF([test "$happy" = "yes"],
[OMPI_FORTRAN_REAL16_C_TYPE="__float128"
AC_MSG_RESULT([works!])],
[AC_MSG_RESULT([does not work])])
])
# We have to [re-]print a new message here, because
# AC_CACHE_CHECK will automatically AC_MSG_RESULT
AC_MSG_CHECKING([for C type matching bit representation of REAL*16])
])
AS_VAR_SET(real16_matches_c_var, [$happy])
],[
# No fortran bindings or no REAL*16
AS_IF([test "$OMPI_TRY_FORTRAN_BINDINGS" = "$OMPI_FORTRAN_NO_BINDINGS"],
[msg="skipped (no Fortran MPI bindings)"],
[msg="skipped (no REAL*16)"])
AS_VAR_SET(real16_matches_c_var, [$msg])
])
])
AS_VAR_COPY([ompi_real16_matches_c], [real16_matches_c_var])
AS_VAR_POPDEF([real16_matches_c_var])
AS_IF([test "$ompi_real16_matches_c" = "yes"],
[define_value=1],
[define_value=0
AC_MSG_WARN([MPI_REAL16 and MPI_COMPLEX32 support have been disabled])])
AC_DEFINE_UNQUOTED([OMPI_REAL16_MATCHES_C], [$define_value],
[Whether Fortran REAL*16 matches the bit format of the equivalent C type])
OPAL_VAR_SCOPE_POP
])
# OMPI_FORTRAN_CHECK_REAL16_C_EQUIV_TYPE(type, suffix)
# ----------------------------------------------------
AC_DEFUN([OMPI_FORTRAN_CHECK_REAL16_EQUIV_TYPE],[
# C module
cat > conftest_c.c <<EOF
#include <stdio.h>
#include <stdlib.h>
#ifdef __cplusplus
extern "C" {
#endif
void c_backend($1 *a) {
$1 foo = 11;
FILE *fp = fopen("conftestval", "w");
if (NULL == fp) exit(1);
foo = 1 / foo;
fprintf(fp, "%s\n", (foo == *a) ? "yes" : "no");
fclose(fp);
}
void C($1 *a) { c_backend(a); }
void c($1 *a) { c_backend(a); }
void c_($1 *a) { c_backend(a); }
/* JMS I'm pretty sure this one will never happen...? */
void c__($1 *a) { c_backend(a); }
#ifdef __cplusplus
}
#endif
EOF
# Fortran module
cat > conftest_f.f <<EOF
program bogus
REAL*16 :: foo = 11
foo = 1 / foo
call c(foo)
end program bogus
EOF
rm -f conftestval
# Compile and link
OPAL_LOG_COMMAND([$CC $CFLAGS -I. -c conftest_c.c],
[OPAL_LOG_COMMAND([$FC $FCFLAGS conftest_f.f conftest_c.o -o conftest $LDFLAGS $LIBS],
[happy="yes"], [happy="no"])], [happy="no"])
AS_IF([test "$happy" = "no"],
[AC_MSG_RESULT([Could not determine if REAL*16 bit-matches C type])],
# If it worked so far, try running to see what we get
[AS_IF([test "$happy" = "yes" && test "$cross_compiling" = "yes"],
[AC_MSG_RESULT([Error!])
AC_MSG_ERROR([Can not determine if REAL*16 bit-matches C if cross compiling])],
[OPAL_LOG_COMMAND([./conftest],
[happy=`cat conftestval`],
[AC_MSG_RESULT([Error!])
AC_MSG_ERROR([Could not determine if REAL*16 bit-matches C type])
])
])
])
# All done; whack tmp files
rm -rf conftest*
])