[mpich-commits] [mpich] MPICH primary repository branch, master, updated. v3.1rc2-11-g0dcb614

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http://git.mpich.org/mpich.git/commitdiff/0dcb61440ebcec65bc460c22c986b8d26e52a7ce

commit 0dcb61440ebcec65bc460c22c986b8d26e52a7ce
Author: Ken Raffenetti <raffenet at mcs.anl.gov>
Date:   Fri Nov 22 10:46:00 2013 -0600

    strengthen test for weak alias attribute
    
    Adds the -Werror flag to this test because in cases like icc/osx
    the compiler only throws a warning that it will ignore function
    __attribute__ defs, but in this case we need to know if they actually
    work.
    
    Fixes #1980
    
    Signed-off-by: Antonio J. Pena <apenya at mcs.anl.gov>

diff --git a/confdb/aclocal_cc.m4 b/confdb/aclocal_cc.m4
index 1e5e87d..f8146e1 100644
--- a/confdb/aclocal_cc.m4
+++ b/confdb/aclocal_cc.m4
@@ -361,8 +361,18 @@ pac_cv_attr_weak_import=yes,pac_cv_attr_weak_import=no)])
 # Check if the alias option for weak attributes is allowed
 AC_CACHE_CHECK([whether __attribute__((weak,alias(...))) allowed],
 pac_cv_attr_weak_alias,[
+# We add -Werror if it's gcc to force an error exit if the weak attribute
+# isn't understood
+if test $GCC = yes ; then
+  save_CFLAGS=$CFLAGS
+  CFLAGS=-Werror
+fi
 AC_TRY_COMPILE([int foo(int) __attribute__((weak,alias("__foo")));],[int a;],
-pac_cv_attr_weak_alias=yes,pac_cv_attr_weak_alias=no)])
+pac_cv_attr_weak_alias=yes,pac_cv_attr_weak_alias=no)
+# Restore original CFLAGS
+if test $GCC = yes ; then
+  CFLAGS=$save_CFLAGS
+fi])
 if test "$pac_cv_attr_weak_alias" = "yes" ; then
     AC_DEFINE(HAVE_WEAK_ATTRIBUTE,1,[Attribute style weak pragma])
 fi

-----------------------------------------------------------------------

Summary of changes:
 confdb/aclocal_cc.m4 |   12 +++++++++++-
 1 files changed, 11 insertions(+), 1 deletions(-)


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