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Autotools: Fix stack direction check #15528

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Merged
merged 3 commits into from
Aug 21, 2024
Merged

Autotools: Fix stack direction check #15528

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e67befc
Autotools: Fix stack direction check
petk Aug 21, 2024
4841e86
[skip ci] Fix CS a bit
petk Aug 21, 2024
f7f2576
Simplify test program with a single definition
petk Aug 21, 2024
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14 changes: 10 additions & 4 deletions Zend/Zend.m4
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Original file line number Diff line number Diff line change
Expand Up @@ -223,11 +223,17 @@ AC_DEFUN([ZEND_CHECK_STACK_DIRECTION],
[AC_RUN_IFELSE([AC_LANG_SOURCE([dnl
#include <stdint.h>

#ifdef __has_builtin
# if __has_builtin(__builtin_frame_address)
# define builtin_frame_address __builtin_frame_address(0)
# endif
#endif

int (*volatile f)(uintptr_t);

int stack_grows_downwards(uintptr_t arg) {
#if defined(__has_builtin) && __has_builtin(__builtin_frame_address)
uintptr_t addr = (uintptr_t)__builtin_frame_address(0);
#ifdef builtin_frame_address
uintptr_t addr = (uintptr_t)builtin_frame_address;
#else
int local;
uintptr_t addr = (uintptr_t)&local;
Expand All @@ -237,8 +243,8 @@ int stack_grows_downwards(uintptr_t arg) {
}

int main(void) {
#if defined(__has_builtin) && __has_builtin(__builtin_frame_address)
uintptr_t addr = (uintptr_t)__builtin_frame_address(0);
#ifdef builtin_frame_address
uintptr_t addr = (uintptr_t)builtin_frame_address;
#else
int local;
uintptr_t addr = (uintptr_t)&local;
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