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openmpi/config/ompi_fortran_check_real16_c_equiv.m4
Jeff Squyres b29b852281 Consolidate all the opal/orte/ompi .m4 files back to the top-level
config/ directory.  We split them apart a while ago in the hopes that
it would simplify things, but it didn't really (e.g., because there
were still some ompi/opal .m4 files in the top-level config/
directory, resulting in developer confusion where any given m4 macro
was defined).

So this commit consolidates them back into the top-level directory for
simplicity.  

There's still (at least) two changes that would be nice to make:

 1. Split any generated .m4 file (e.g., autogen-generated .m4 files)
    into a separate directory somewhere so that a top-level -Iconfig/
    will only get our explicitly defined macros, not the autogen stuff
    (e.g., with libevent2019 needing to get the visibility macro, but
    NOT all the autogen-generated inclusion of component configure.m4
    files).
 1. Change configure to be of the form:
{{{
# ...a small amount of preamble/setup...
OPAL_SETUP
m4_ifdef([project_orte], [ORTE_SETUP])
m4_ifdef([project_ompi], [OMPI_SETUP])
# ...a small amount of finishing stuff...
}}}

I doubt we'll ever get anything as clean as that, but that would be
the goal to shoot for.

This commit was SVN r27704.
2012-12-19 00:00:36 +00:00

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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) 2008-2012 Cisco Systems, Inc. All rights reserved.
dnl Copyright (c) 2012 Oracle and/or its affiliates. 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
unset CFLAGS_save
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 "$OMPI_WANT_FORTRAN_BINDINGS" = "1" -a "$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 "$ompi_cv_c_compiler_vendor" = "intel"],
[AC_MSG_CHECKING([if intel compiler _Quad == REAL*16])
CFLAGS_save="$CFLAGS"
CFLAGS="$CFLAGS -Qoption,cpp,--extended_float_types"
OPAL_UNIQ([CFLAGS])
OMPI_FORTRAN_CHECK_REAL16_EQUIV_TYPE([_Quad], [q])
AS_IF([test "$happy" = "yes"],
[OMPI_FORTRAN_REAL16_C_TYPE="_Quad"
AC_MSG_RESULT([works!])],
[CFLAGS="$CFLAGS_save"
AC_MSG_RESULT([does not work])])
])
AS_IF([test "$ompi_cv_c_compiler_vendor" = "gnu" -a "$ac_cv_type___float128" = "yes"],
[AC_MSG_CHECKING([if gnu compiler __float128 == REAL*16])
OPAL_UNIQ([CFLAGS])
OMPI_FORTRAN_CHECK_REAL16_EQUIV_TYPE([__float128], [q])
AS_IF([test "$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_WANT_FORTRAN_BINDINGS" = "0"],
[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 "$happy" = "yes" -a "$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*
])