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| author | Brad King <brad.king@kitware.com> | 2010-07-02 17:57:19 (GMT) |
|---|---|---|
| committer | Brad King <brad.king@kitware.com> | 2010-07-02 18:00:04 (GMT) |
| commit | c3389d4ce2a8d3ee0ec1d4824a64347ded5832a0 (patch) | |
| tree | 9b5bdb97ebf042175e2e79fd0fdfab57057d3533 /Source/kwsys/testProcess.c | |
| parent | 9f3524f4696f394e04077aed93b482ed72cda4ca (diff) | |
| download | CMake-c3389d4ce2a8d3ee0ec1d4824a64347ded5832a0.zip CMake-c3389d4ce2a8d3ee0ec1d4824a64347ded5832a0.tar.gz CMake-c3389d4ce2a8d3ee0ec1d4824a64347ded5832a0.tar.bz2 | |
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.
Diffstat (limited to 'Source/kwsys/testProcess.c')
| -rw-r--r-- | Source/kwsys/testProcess.c | 5 |
1 files changed, 5 insertions, 0 deletions
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; |