[Cmake-commits] CMake branch, master, updated. v2.8.2-28-gc3389d4

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- Log -----------------------------------------------------------------
http://cmake.org/gitweb?p=cmake.git;a=commitdiff;h=c3389d4ce2a8d3ee0ec1d4824a64347ded5832a0
commit c3389d4ce2a8d3ee0ec1d4824a64347ded5832a0
Author: Brad King <brad.king at kitware.com>
Date:   Fri Jul 2 13:57:19 2010 -0400

    KWSys: Avoid Clang optimizer bug in testProcess-[45]
    
    Clang's optimizer, as of clang version 2.8 (trunk 107463), produces the
    undefined instruction 'ud2' for the code "*(int*)0=0" on OS X x86_64.
    It causes our crash tests to fail because the child process exits with
    an invalid instruction instead of a segmentation fault.  Work around the
    bug by using "*(int*)1=0" in this case.

diff --git a/Source/kwsys/testProcess.c b/Source/kwsys/testProcess.c
index 0060c4d..6044917 100644
--- a/Source/kwsys/testProcess.c
+++ b/Source/kwsys/testProcess.c
@@ -94,7 +94,12 @@ int test4(int argc, const char* argv[])
   fprintf(stderr, "Output before crash on stderr from crash test.\n");  
   fflush(stdout);
   fflush(stderr);
+#if defined(__APPLE__) && defined(__x86_64__) && defined(__OPTIMIZE__) \
+ && defined(__clang__)
+  *(int*)1 = 0; /* Clang's optimizer produces bad code for 0-ptr.  */
+#else
   *(int*)0 = 0;
+#endif
   fprintf(stdout, "Output after crash on stdout from crash test.\n");
   fprintf(stderr, "Output after crash on stderr from crash test.\n");
   return 0;

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

Summary of changes:
 Source/kwsys/testProcess.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)


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