https://github.com/python/cpython/commit/2271fbb369a78fcd3ac00c526ca6711140144e43
commit: 2271fbb369a78fcd3ac00c526ca6711140144e43
branch: main
author: Sergey B Kirpichev <[email protected]>
committer: vstinner <[email protected]>
date: 2026-09-02T17:21:22+02:00
summary:
gh-153740: Refine test for _Float16: check support from libm (#156815)
files:
M configure
M configure.ac
diff --git a/configure b/configure
index e0ad04b036aeb1..a2ca40de07d54e 100755
--- a/configure
+++ b/configure
@@ -16745,12 +16745,14 @@ else case e in #(
e) cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
+#include <math.h>
int main(void)
{
_Float16 val = 1.0f16;
+ int test = isinf(val) || isnan(val); /* basic support from libm */
double d = 3.14;
val = d;
- return 0;
+ return test;
}
_ACEOF
diff --git a/configure.ac b/configure.ac
index 2b8a5b052878c9..e1333230fefa68 100644
--- a/configure.ac
+++ b/configure.ac
@@ -4474,12 +4474,14 @@ AC_CACHE_CHECK([for _Float16 support],
[ac_cv_float16_supported],
WITH_SAVE_ENV([
CFLAGS="$CFLAGS -O0"
AC_RUN_IFELSE([AC_LANG_SOURCE([[
+#include <math.h>
int main(void)
{
_Float16 val = 1.0f16;
+ int test = isinf(val) || isnan(val); /* basic support from libm */
double d = 3.14;
val = d;
- return 0;
+ return test;
}
]])], [ac_cv_float16_supported=yes],
[ac_cv_float16_supported=no],
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