[mpich-commits] [mpich] MPICH primary repository branch, master, updated. v3.1.1-22-gf8c8d5a

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- Log -----------------------------------------------------------------
http://git.mpich.org/mpich.git/commitdiff/f8c8d5aa6e3081716c3ee38f83f528bc7a061c49

commit f8c8d5aa6e3081716c3ee38f83f528bc7a061c49
Author: Huiwei Lu <huiweilu at mcs.anl.gov>
Date:   Thu Jun 19 16:38:05 2014 -0500

    Improve checking for C compiler options on Solaris
    
    When using --enable-strict, configure tests for support of certain flags
    with the selected compiler. PAC_C_CHECK_COMPILER_OPTION (in
    confdb/aclocal_cc.m4) should be able to detect that the
    "-D_POSIX_C_SOURCE=200112L" flag is not accepted by the Solaris compiler,
    but it does not. The method used (AC_LANG_PROGRAM() in confdb/aclocal_cc.m4:48)
    uses an empty parameter, the result of which is an empty main that somehow
    passes the detection. Replacing it with a "hello world" test case will
    correctly detect the error and remove "-D_POSIX_C_SOURCE=200112L" from the
    accepted flags. Configure can then complete successfully.
    
    Note that compilation in this configuration will still freeze due to a
    solaris compiler bug. See #2105.
    
    Signed-off-by: Ken Raffenetti <raffenet at mcs.anl.gov>

diff --git a/RELEASE_NOTES b/RELEASE_NOTES
index 8ece71f..43977b7 100644
--- a/RELEASE_NOTES
+++ b/RELEASE_NOTES
@@ -2,6 +2,15 @@
                         KNOWN ISSUES
 ----------------------------------------------------------------------
 
+### Solaris compilers
+
+ * Compilation on solaris will freeze when MPICH is configured with 
+   "--enable-strict". This is due to a solaris compiler bug related
+   to a specific order of assignments to long long and short variables.
+   See the following ticket for more information:
+
+     https://trac.mpich.org/projects/mpich/ticket/2105
+
 ### Fine-grained thread safety
 
  * ch3:sock does not (and will not) support fine-grained threading.
diff --git a/confdb/aclocal_cc.m4 b/confdb/aclocal_cc.m4
index 23172d9..f03e0c2 100644
--- a/confdb/aclocal_cc.m4
+++ b/confdb/aclocal_cc.m4
@@ -45,7 +45,10 @@ CFLAGS_orig="$CFLAGS"
 CFLAGS_opt="$pac_opt $CFLAGS"
 pac_result="unknown"
 
-AC_LANG_CONFTEST([AC_LANG_PROGRAM()])
+AC_LANG_CONFTEST([
+	AC_LANG_PROGRAM([[const char hw[] = "Hello, World\n";]],
+		[[fputs (hw, stdout);]])
+])
 CFLAGS="$CFLAGS_orig"
 rm -f pac_test1.log
 PAC_LINK_IFELSE_LOG([pac_test1.log], [], [

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

Summary of changes:
 RELEASE_NOTES        |    9 +++++++++
 confdb/aclocal_cc.m4 |    5 ++++-
 2 files changed, 13 insertions(+), 1 deletions(-)


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