From 2df0ede613b950a64657c76b0d4a0bd206cb927f Mon Sep 17 00:00:00 2001
From: Gilles Gouaillardet <gilles.gouaillardet@iferc.org>
Date: Tue, 19 Aug 2014 05:52:34 +0000
Subject: [PATCH] configury: disable pshmem if buggy compiler is detected

PGI compilers older that 2013 have a buggy preprocessor
that does not support pragma defined in a macro called
itself called from an other macro

cmr=v1.8.2:reviewer=jsquyres

This commit was SVN r32551.
---
 config/c_weak_symbols.m4           | 46 ++++++++++++++++++++++++++++++
 config/oshmem_configure_options.m4 | 12 ++++++--
 2 files changed, 55 insertions(+), 3 deletions(-)

diff --git a/config/c_weak_symbols.m4 b/config/c_weak_symbols.m4
index cdea4e0497..64fa9ad91a 100644
--- a/config/c_weak_symbols.m4
+++ b/config/c_weak_symbols.m4
@@ -10,6 +10,8 @@ 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) 2014      Research Organization for Information Science
+dnl                         and Technology (RIST). All rights reserved.
 dnl $COPYRIGHT$
 dnl 
 dnl Additional copyrights may follow
@@ -56,6 +58,50 @@ OPAL_LOG_COMMAND(
 ])
 
 
+# _OPAL_C_MACRO_WEAK_SYMBOLS(action_if_found, [action_if_not_found])
+# ------------------------------------------------------------
+AC_DEFUN([_OPAL_C_MACRO_WEAK_SYMBOLS],[
+    # need two files because icc will incorrectly not create the
+    # symbols if they are not used in the object file in which they
+    # are defined.  Blah!
+    # To get to compile with icc, have them in a separate header.
+    cat > conftest_weak.h <<EOF
+int real(int i);
+int fake1(int i);
+int fake2(int i);
+
+#define GENERATE_WEAK_PRAGMA(x) _Pragma(#x)
+#define GENERATE_TWO_WEAK_PRAGMAS(real, fake) \
+    GENERATE_WEAK_PRAGMA(weak fake##1 = real) \
+    GENERATE_WEAK_PRAGMA(weak fake##2 = real)
+EOF
+
+    cat > conftest_weak.c <<EOF
+#include "conftest_weak.h"
+GENERATE_TWO_WEAK_PRAGMAS(real, fake)
+int real(int i) { return i; }
+EOF
+
+    cat > conftest.c <<EOF
+#include "conftest_weak.h"
+int main() { return fake1(3) + fake2(3); }
+EOF
+
+# Try the compile
+OPAL_LOG_COMMAND(
+    [$CC $CFLAGS  -c conftest_weak.c],
+    OPAL_LOG_COMMAND(
+        [$CC $CFLAGS  conftest.c conftest_weak.o -o conftest $LDFLAGS $LIBS],
+        [opal_c_macro_weak_symbols_happy=1],
+	[opal_c_macro_weak_symbols_happy=0]),
+    [opal_c_macro_weak_symbols_happy=0])
+
+    AS_IF([test "$opal_c_macro_weak_symbols_happy" = "1"], [$1], [$2])
+
+    unset opal_c_macro_weak_symbols_happy
+    rm -f conftest_weak.h conftest_weak.c conftest.c conftest
+])
+
 # OPAL_C_WEAK_SYMBOLS()
 # ---------------------
 # sets OPAL_C_WEAK_SYMBOLS=1 if C compiler has support for weak symbols
diff --git a/config/oshmem_configure_options.m4 b/config/oshmem_configure_options.m4
index 8a709f4b5e..d6f2eb8fb6 100644
--- a/config/oshmem_configure_options.m4
+++ b/config/oshmem_configure_options.m4
@@ -4,6 +4,8 @@ dnl Copyright (c) 2013      Mellanox Technologies, Inc.
 dnl                         All rights reserved.
 dnl Copyright (c) 2013-2014 Cisco Systems, Inc.  All rights reserved.
 dnl Copyright (c) 2014      Intel, Inc. All rights reserved
+dnl Copyright (c) 2014      Research Organization for Information Science
+dnl                         and Technology (RIST). All rights reserved.
 dnl $COPYRIGHT$
 dnl
 dnl Additional copyrights may follow
@@ -105,9 +107,13 @@ AC_ARG_ENABLE(oshmem-profile,
                    [enable OSHMEM profiling (default: enabled)]))
 if test "$enable_oshmem" != "no" -a "$enable_oshmem_profile" != "no"; then
     _OPAL_C_WEAK_SYMBOLS([
-        AC_MSG_RESULT([yes])
-        oshmem_profiling_support=1
-        ], [
+        _OPAL_C_MACRO_WEAK_SYMBOLS([
+            AC_MSG_RESULT([yes])
+            oshmem_profiling_support=1],[
+            AC_MSG_RESULT([no])
+            AC_MSG_WARN([Macro defined weak symbols not supported by compiler.
+                         Profiling will be disabled.])
+            oshmem_profiling_support=0])], [
         AC_MSG_RESULT([no])
         AC_MSG_WARN([Weak symbols not supported by compiler.
                      Profiling will be disabled.])