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[3.7] bpo-37415: Fix stdatomic.h header check for ICC compiler (GH-16717) #16892

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Merged
miss-islington merged 1 commit into from
Oct 22, 2019
Merged

[3.7] bpo-37415: Fix stdatomic.h header check for ICC compiler (GH-16717) #16892

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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Build/2019-10-11-15-32-58.bpo-37415.D9RXrq.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Fix stdatomic.h header check for ICC compiler: the ICC implementation lacks
atomic_uintptr_t type which is needed by Python.
7 changes: 5 additions & 2 deletions configure
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Expand Up @@ -16849,9 +16849,12 @@ cat confdefs.h - <<_ACEOF >conftest.$ac_ext


#include <stdatomic.h>
atomic_int value = ATOMIC_VAR_INIT(1);
atomic_int int_var;
atomic_uintptr_t uintptr_var;
int main() {
int loaded_value = atomic_load(&value);
atomic_store_explicit(&int_var, 5, memory_order_relaxed);
atomic_store_explicit(&uintptr_var, 0, memory_order_relaxed);
int loaded_value = atomic_load_explicit(&int_var, memory_order_seq_cst);
return 0;
}

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9 changes: 6 additions & 3 deletions configure.ac
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Expand Up @@ -5492,9 +5492,12 @@ AC_LINK_IFELSE(
[
AC_LANG_SOURCE([[
#include <stdatomic.h>
atomic_int value = ATOMIC_VAR_INIT(1);
atomic_int int_var;
atomic_uintptr_t uintptr_var;
int main() {
int loaded_value = atomic_load(&value);
atomic_store_explicit(&int_var, 5, memory_order_relaxed);
atomic_store_explicit(&uintptr_var, 0, memory_order_relaxed);
int loaded_value = atomic_load_explicit(&int_var, memory_order_seq_cst);
return 0;
}
]])
Expand All @@ -5504,7 +5507,7 @@ AC_MSG_RESULT($have_stdatomic_h)

if test "$have_stdatomic_h" = yes; then
AC_DEFINE(HAVE_STD_ATOMIC, 1,
[Has stdatomic.h with atomic_int])
[Has stdatomic.h with atomic_int and atomic_uintptr_t])
fi

# Check for GCC >= 4.7 __atomic builtins
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2 changes: 1 addition & 1 deletion pyconfig.h.in
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Expand Up @@ -963,7 +963,7 @@
/* Define to 1 if you have the <stdlib.h> header file. */
#undef HAVE_STDLIB_H

/* Has stdatomic.h with atomic_int */
/* Has stdatomic.h with atomic_int and atomic_uintptr_t */
#undef HAVE_STD_ATOMIC

/* Define to 1 if you have the `strdup' function. */
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