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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) 2009 Sun Microsystems, Inc. All rights reserved.
dnl $COPYRIGHT$
dnl
dnl Additional copyrights may follow
dnl
dnl $HEADER$
dnl
# OMPI_C_GET_ALIGN(type, config_var)
# ----------------------------------
# Determine datatype alignment.
# First arg is type, 2nd arg is config var to define.
AC_DEFUN([OMPI_C_GET_ALIGNMENT],[
AC_CACHE_CHECK([alignment of $1],
[AS_TR_SH([ompi_cv_c_align_$1])],
[AC_RUN_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],
[[
struct foo { char c; $1 x; };
struct foo *p = (struct foo *) malloc(sizeof(struct foo));
int diff;
FILE *f=fopen("conftestval", "w");
if (!f) exit(1);
diff = ((char *)&p->x) - ((char *)&p->c);
fprintf(f, "%d\n", (diff >= 0) ? diff : -diff);
]])], [AS_TR_SH([ompi_cv_c_align_$1])=`cat conftestval`],
[AC_MSG_WARN([*** Problem running configure test!])
AC_MSG_WARN([*** See config.log for details.])
AC_MSG_ERROR([*** Cannot continue.])],
[ # cross compile - do a non-executable test. Trick
# taken from the Autoconf 2.59c. Switch to using
# AC_CHECK_ALIGNOF when we can require Autoconf 2.60.
_AC_COMPUTE_INT([(long int) offsetof (ompi__type_alignof_, y)],
[AS_TR_SH([ompi_cv_c_align_$1])],
[AC_INCLUDES_DEFAULT
#ifndef offsetof
# define offsetof(type, member) ((char *) &((type *) 0)->member - (char *) 0)
#endif
typedef struct { char x; $1 y; } ompi__type_alignof_;
],
[AC_MSG_WARN([*** Problem running configure test!])
AC_MSG_WARN([*** See config.log for details.])
AC_MSG_ERROR([*** Cannot continue.])])])])
AC_DEFINE_UNQUOTED([$2], [$AS_TR_SH([ompi_cv_c_align_$1])], [Alignment of type $1])
eval "$2=$AS_TR_SH([ompi_cv_c_align_$1])"
rm -rf conftest* ]) dnl
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