20e2dd6da8
Add more exact test-cases to configure.ac to prevent it assuming support of __atomic_add/fetch/... symbols on i386 (Clang > 4). Sponsored by: The FreeBSD Foundation
26 lines
890 B
Plaintext
26 lines
890 B
Plaintext
--- build/m4/ax_c___atomic.m4.orig 2018-12-26 13:22:11 UTC
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+++ build/m4/ax_c___atomic.m4
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@@ -6,7 +6,12 @@ AC_DEFUN([AC_C___ATOMIC],
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[AC_CACHE_CHECK([for __atomic], ac_cv_c___atomic,
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[AC_LINK_IFELSE(
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[AC_LANG_SOURCE(
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- [[int
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+ [[typedef struct test {
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+ volatile uint16_t a;
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+ volatile uint64_t b;
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+ volatile uint64_t c;
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+ } test_t;
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+ int
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main (int argc, char **argv)
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{
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volatile unsigned long ul1 = 1, ul2 = 0, ul3 = 2;
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@@ -23,6 +28,8 @@ AC_DEFUN([AC_C___ATOMIC],
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__atomic_fetch_sub(&ull3, 1, __ATOMIC_SEQ_CST);
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__atomic_or_fetch(&ull1, ull2, __ATOMIC_SEQ_CST);
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__atomic_and_fetch(&ull1, ull2, __ATOMIC_SEQ_CST);
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+ volatile test_t test = {.a = 0, .b = 0, .c = 1};
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+ __atomic_fetch_add(&test.b, 1, __ATOMIC_SEQ_CST);
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return 0;
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}
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]])],
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