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gh-112779: Check 1-byte atomics in configure (gh-112819)

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Sam Gross 2023-12-08 11:31:32 -05:00 committed by GitHub
parent c744dbe9ac
commit 4d1eea59bd
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 28 additions and 8 deletions
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18
configure generated vendored
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@ -27885,6 +27885,9 @@ printf "%s\n" "$TEST_MODULES" >&6; }
# libatomic __atomic_fetch_or_8(), or not, depending on the C compiler and the
# compiler flags.
#
# gh-112779: On RISC-V, GCC 12 and earlier require libatomic support for 1-byte
# and 2-byte operations, but not for 8-byte operations.
#
# Avoid #include <Python.h> or #include <pyport.h>. The <Python.h> header
# requires <pyconfig.h> header which is only written below by AC_OUTPUT below.
# If the check is done after AC_OUTPUT, modifying LIBS has no effect
@ -27924,12 +27927,19 @@ typedef intptr_t Py_ssize_t;
int main()
{
uint64_t byte;
_Py_atomic_store_uint64(&byte, 2);
if (_Py_atomic_or_uint64(&byte, 8) != 2) {
uint64_t value;
_Py_atomic_store_uint64(&value, 2);
if (_Py_atomic_or_uint64(&value, 8) != 2) {
return 1; // error
}
if (_Py_atomic_load_uint64(&byte) != 10) {
if (_Py_atomic_load_uint64(&value) != 10) {
return 1; // error
}
uint8_t byte = 0xb8;
if (_Py_atomic_or_uint8(&byte, 0x2d) != 0xb8) {
return 1; // error
}
if (_Py_atomic_load_uint8(&byte) != 0xbd) {
return 1; // error
}
return 0; // all good

18
configure.ac
View File

@ -7023,6 +7023,9 @@ AC_SUBST([TEST_MODULES])
# libatomic __atomic_fetch_or_8(), or not, depending on the C compiler and the
# compiler flags.
#
# gh-112779: On RISC-V, GCC 12 and earlier require libatomic support for 1-byte
# and 2-byte operations, but not for 8-byte operations.
#
# Avoid #include <Python.h> or #include <pyport.h>. The <Python.h> header
# requires <pyconfig.h> header which is only written below by AC_OUTPUT below.
# If the check is done after AC_OUTPUT, modifying LIBS has no effect
@ -7052,12 +7055,19 @@ typedef intptr_t Py_ssize_t;
int main()
{
uint64_t byte;
_Py_atomic_store_uint64(&byte, 2);
if (_Py_atomic_or_uint64(&byte, 8) != 2) {
uint64_t value;
_Py_atomic_store_uint64(&value, 2);
if (_Py_atomic_or_uint64(&value, 8) != 2) {
return 1; // error
}
if (_Py_atomic_load_uint64(&byte) != 10) {
if (_Py_atomic_load_uint64(&value) != 10) {
return 1; // error
}
uint8_t byte = 0xb8;
if (_Py_atomic_or_uint8(&byte, 0x2d) != 0xb8) {
return 1; // error
}
if (_Py_atomic_load_uint8(&byte) != 0xbd) {
return 1; // error
}
return 0; // all good