From 74b4028b47602259b230196d712e204abd7840c3 Mon Sep 17 00:00:00 2001
From: Craig E Rasmussen <rasmus@cas.uoregon.edu>
Date: Wed, 12 Jan 2005 18:22:22 +0000
Subject: [PATCH] Initial version.

This commit was SVN r3965.
---
 config/f90_get_alignment.m4 | 124 ++++++++++++++++++++++++++++++++++++
 1 file changed, 124 insertions(+)
 create mode 100644 config/f90_get_alignment.m4

diff --git a/config/f90_get_alignment.m4 b/config/f90_get_alignment.m4
new file mode 100644
index 0000000000..8b87bcc12d
--- /dev/null
+++ b/config/f90_get_alignment.m4
@@ -0,0 +1,124 @@
+dnl -*- shell-script -*-
+dnl
+dnl Copyright (c) 2004-2005 The Trustees of Indiana University.
+dnl                         All rights reserved.
+dnl Copyright (c) 2004-2005 The Trustees of the University of Tennessee.
+dnl                         All rights reserved.
+dnl Copyright (c) 2004-2005 High Performance Computing Center Stuttgart, 
+dnl                         University of Stuttgart.  All rights reserved.
+dnl $COPYRIGHT$
+dnl 
+dnl Additional copyrights may follow
+dnl 
+dnl $HEADER$
+dnl
+
+AC_DEFUN([OMPI_F90_GET_ALIGNMENT],[
+# Determine FORTRAN datatype size.
+# First arg is type, 2nd arg is config var to define.
+AC_MSG_CHECKING(alignment of FORTRAN $1)
+ompi_ac_align_fn=
+if test "x$ompi_ac_doubleunder" = xy || test "x$ompi_ac_singleunder" = xy; then
+    ompi_ac_align_fn=align_
+else
+    if test "x$ompi_ac_nounder" = xy; then
+	ompi_ac_align_fn=align
+    else
+	if test "x$ompi_ac_caps" = xy; then
+	    ompi_ac_align_fn=ALIGN
+	else
+	    AC_MSG_WARN([*** FORTRAN external naming convention undefined])
+	    AC_MSG_ERROR([*** Cannot continue.])
+	fi
+    fi
+fi
+
+#
+# Fortran module
+#
+
+cat > conftestf.f90 <<EOF
+module OMPI_TEST_ALIGN
+  type TestAlign
+    character a
+    $1 :: x
+  end type
+end module
+
+program f90align
+  use OMPI_TEST_ALIGN
+  external ALIGN
+  type(TestAlign) :: a
+  call ALIGN(a%a, a%x)
+end program
+EOF
+
+#
+# C module
+#
+
+if test -f conftest.h; then
+    ompi_conftest_h="#include \"conftest.h\""
+else
+    ompi_conftest_h=""
+fi
+cat > conftest.c <<EOF
+#include <stdio.h>
+#include <stdlib.h>
+$conftest
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+void $ompi_ac_align_fn(char *a, char *x)
+{
+    int diff;
+    FILE *f=fopen("conftestval", "w");
+    if (!f) exit(1);
+    diff = a - x;
+    fprintf(f, "%d\n", (diff >= 0) ? diff : -diff);
+    fclose(f);
+}
+#ifdef __cplusplus
+}
+#endif
+EOF
+
+#
+# Try the compilation and run.  Can't use AC_TRY_RUN because it's two
+# module files.
+#
+
+OMPI_LOG_COMMAND([$CC $CFLAGS -I. -c conftest.c],
+    OMPI_LOG_COMMAND([$FC $FCFLAGS $FCFLAGS_f90 conftestf.f90 conftest.o -o conftest],
+	OMPI_LOG_COMMAND([./conftest],[HAPPY=1],[HAPPY=0]),
+	[HAPPY=0]),
+    [HAPPY=0])
+
+if test "$HAPPY" = "1" -a -f conftestval; then
+    ompi_ac_align=`cat conftestval`
+    AC_MSG_RESULT([$ompi_ac_align])
+    if test -n "$2"; then
+	eval "$2=$ompi_ac_align"
+    fi
+else
+    AC_MSG_RESULT([unknown])
+
+    OMPI_LOG_MSG([here is the C program:], 1)
+    OMPI_LOG_FILE([conftest.c])
+    if test -f conftest.h; then
+	OMPI_LOG_MSG([here is contest.h:], 1)
+	OMPI_LOG_FILE([conftest.h])
+    fi
+    OMPI_LOG_MSG([here is the fortran program:], 1)
+    OMPI_LOG_FILE([conftestf.f90])
+
+    AC_MSG_WARN([*** Problem running configure test!])
+    AC_MSG_WARN([*** See config.log for details.])
+    AC_MSG_ERROR([*** Cannot continue.])
+fi
+str="$2=$ompi_ac_align"
+eval $str
+
+unset ompi_ac_align HAPPY ompi_conftest_h
+/bin/rm -f conftest*])dnl