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[Bug #19028] Suppress GCC 12 -Wuse-after-free false warning

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GCC 12 introduced a new warning flag `-Wuse-after-free`, however it
has a false positive at `realloc` when optimization is disabled, since
the memory requested for reallocation is guaranteed to not be touched.
This workaround is very unclear why the false warning is suppressed by
a statement-expression GCC extension.
This commit is contained in:
Nobuyoshi Nakada 2022-10-04 10:54:28 +09:00
parent 6378825df5
commit 40ceceb1a5
Notes: git 2022-10-04 21:54:21 +09:00 
Merged: https://github.com/ruby/ruby/pull/6487
1 changed files with 1 additions and 1 deletions
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gc.c
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@ -12236,7 +12236,7 @@ objspace_xrealloc(rb_objspace_t *objspace, void *ptr, size_t new_size, size_t ol
#endif
old_size = objspace_malloc_size(objspace, ptr, old_size);
TRY_WITH_GC(new_size, mem = realloc(ptr, new_size));
TRY_WITH_GC(new_size, mem = RB_GNUC_EXTENSION_BLOCK(realloc(ptr, new_size)));
new_size = objspace_malloc_size(objspace, mem, new_size);
#if CALC_EXACT_MALLOC_SIZE