Disable getc_unlocked() with MemorySanitizer. (GH-10499)
clang's MemorySanitizer understand getc() but does not understand
getc_unlocked(). Workaround: Don't use it on msan builds.
(cherry picked from commit e6c77d8301ec1703abb755a7d3ce5bd8c999c082)
Co-authored-by: Gregory P. Smith <greg@krypto.org>
diff --git a/Objects/fileobject.c b/Objects/fileobject.c
index 0f71944..a49194e 100644
--- a/Objects/fileobject.c
+++ b/Objects/fileobject.c
@@ -3,7 +3,8 @@
#define PY_SSIZE_T_CLEAN
#include "Python.h"
-#ifdef HAVE_GETC_UNLOCKED
+#if defined(HAVE_GETC_UNLOCKED) && !defined(MEMORY_SANITIZER)
+/* clang MemorySanitizer doesn't yet understand getc_unlocked. */
#define GETC(f) getc_unlocked(f)
#define FLOCKFILE(f) flockfile(f)
#define FUNLOCKFILE(f) funlockfile(f)