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# -*- shell-script -*-
#
# Copyright (c) 2009 IBM Corporation. All rights reserved.
# Copyright (c) 2009 Cisco Systems, Inc. All rights reserved.
# $COPYRIGHT$
#
# Additional copyrights may follow
#
# $HEADER$
#
# This macro checks to ensure that the compiler properly supports
# offsetof(). The PGI compilers had a problem with this macro in some
# versions of their compiler on some platforms (e.g., 9.0-1 on
# x86_64). The workaround is to use -DNO_PGI_OFFSET in these cases.
# A bug report was submitted to PGI support in late June 2009; the
# problem was apparently a trivial typo in one of their header files
# and should be fixed in subsequent releases (e.g., 9.0-2?).
AC_DEFUN([OPAL_CHECK_OFFSETOF],[
OPAL_VAR_SCOPE_PUSH([have_offsetof_msg])
AC_MSG_CHECKING(for functional offsetof macro)
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include<stddef.h>]],
[[struct foo {int a, b;}; size_t offset = offsetof(struct foo, b); ]])],
[have_offsetof_msg="yes"], [have_offsetof_msg="no"])
if test "$have_offsetof_msg" = "no"; then
CPPFLAGS="$CPPFLAGS -DNO_PGI_OFFSET"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include<stddef.h>]],
[[struct foo {int a, b;}; size_t offset = offsetof(struct foo, b); ]])],
[have_offsetof_msg="yes"], [have_offsetof_msg="no"])
if test "$have_offsetof_msg" = "no"; then
AC_MSG_RESULT([$have_offsetof_msg])
AC_MSG_WARN([Your compiler does not support offsetof macro])
AC_MSG_ERROR([Configure: Cannot continue])
fi
fi
AC_MSG_RESULT([$have_offsetof_msg])
OPAL_VAR_SCOPE_POP
])dnl
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