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ba6ba086b2
turns out that __builtin_alloca_with_align() might releases the allocated memory at the end of the block it was allocated in, instead of the end of the function (which is the behavior of regular alloca() and __builtin_alloca()): "The lifetime of the allocated object ends at the end of the block in which the function was called. The allocated storage is released no later than just before the calling function returns to its caller, but may be released at the end of the block in which the function was called." https://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#index-_005f_005fbuiltin_005falloca_005fwith_005falign Clang also supports __builtin_alloca_with_align(), but always releases the memory at the end of the function. And it seems that newer GCC versions also tend to release it at the end of the function, but GCC 4.7.2 (that I use for the official Linux release binaries) didn't, and that caused weird graphical glitches. But as I don't want to rely on newer GCC versions behaving like this (and the documentation explicitly says that it *may* be released at the end of the block, but will definitely be released at the end of the function), I removed all usage of __builtin_alloca_with_align(). (Side-Note: GCC only started documenting the behavior of __builtin_alloca and __builtin_alloca_with_align at all with GCC 6.1.0) |
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| .. | ||
| platform.h | ||
| Stub_SDL_endian.h | ||
| sys_public.h | ||