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bpo-35214: Initial clang MemorySanitizer support (GH-10479)

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Adds configure flags for msan and ubsan builds to make it easier to enable.
These also encode the detail that address sanitizer and memory sanitizer
should disable pymalloc.

Define MEMORY_SANITIZER when appropriate at build time and adds workarounds
to existing code to mark things as initialized where the sanitizer is otherwise unable to
determine that.  This lets our build succeed under the memory sanitizer.  not all tests
pass without sanitizer failures yet but we're in pretty good shape after this.
This commit is contained in:
Gregory P. Smith 2018-11-12 12:07:14 -08:00 • committed by GitHub
parent a9655b7f71
commit 1584a00815
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9 changed files with 115 additions and 4 deletions
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Include/Python.h
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@ -53,6 +53,15 @@
#include "pyport.h"
#include "pymacro.h"
/* A convenient way for code to know if clang's memory sanitizer is enabled. */
#if defined(__has_feature)
# if __has_feature(memory_sanitizer)
# if !defined(MEMORY_SANITIZER)
# define MEMORY_SANITIZER
# endif
# endif
#endif
/* Debug-mode build with pymalloc implies PYMALLOC_DEBUG.
* PYMALLOC_DEBUG is in error if pymalloc is not in use.
*/