While the <fenv.h> changes in mingw 13.0.0 are working all right,
in mingw 14.0.0 they added broken implementations of feenableexcept()
and fedisableexcept(). This leads to Gnulib test suite failures:
$ ./gnulib-tool --create-testdir --dir=../testdir1 \
fenv-environment fenv-exceptions-state-c23 \
fenv-exceptions-tracking-c23 fenv-exceptions-trapping \
fenv-rounding
=>
FAIL: test-fenv-env-2
=====================
../../gltests/test-fenv-env-2.c:70: assertion 'fegetexcept () ==
(supports_trapping ? FE_DIVBYZERO : 0)' failed
FAIL test-fenv-env-2.exe (exit status: 3)
FAIL: test-fenv-env-3
=====================
../../gltests/test-fenv-env-3.c:70: assertion 'fegetexcept () ==
(supports_trapping ? FE_DIVBYZERO : 0)' failed
FAIL test-fenv-env-3.exe (exit status: 3)
FAIL: test-fenv-env-4
=====================
../../gltests/test-fenv-env-4.c:67: assertion 'fegetexcept () == 0' failed
FAIL test-fenv-env-4.exe (exit status: 3)
FAIL: test-fenv-env-5
=====================
../../gltests/test-fenv-env-5.c:67: assertion 'fegetexcept () == 0' failed
FAIL test-fenv-env-5.exe (exit status: 3)
FAIL: test-fenv-except-trapping-1
=================================
../../gltests/test-fenv-except-trapping-1.c:63: assertion 'fedisableexcept
(uint_to_exceptions (b)) == uint_to_exceptions (a)' failed
FAIL test-fenv-except-trapping-1.exe (exit status: 3)
This patch adds a workaround: it overrides these broken implementations on
mingw.
2026-03-30 Bruno Haible <[email protected]>
fenv-exceptions-trapping: Work around mingw 14.0.0 bug.
* m4/fenv-exceptions-trapping.m4 (gl_FENV_EXCEPTIONS_TRAPPING): Override
feenableexcept, fedisableexcept also on mingw.
diff --git a/m4/fenv-exceptions-trapping.m4 b/m4/fenv-exceptions-trapping.m4
index dc388de27b..3679734775 100644
--- a/m4/fenv-exceptions-trapping.m4
+++ b/m4/fenv-exceptions-trapping.m4
@@ -1,5 +1,5 @@
# fenv-exceptions-trapping.m4
-# serial 3
+# serial 4
dnl Copyright (C) 2023-2026 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -20,6 +20,7 @@ AC_DEFUN_ONCE([gl_FENV_EXCEPTIONS_TRAPPING]
dnl Fixed through
dnl
<https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=302949e2940a9da3f6364a1574619e621b7e1e71>.
dnl Similarly on FreeBSD 12.2/arm, FreeBSD 12.2/arm64, NetBSD 10.0/arm64.
+ dnl On mingw 14.0.0, feenableexcept and fedisableexcept are broken as well.
case "$host" in
aarch64*-*-linux*)
AC_CACHE_CHECK([whether feenableexcept works],
@@ -43,7 +44,8 @@ AC_DEFUN_ONCE([gl_FENV_EXCEPTIONS_TRAPPING]
*) REPLACE_FEENABLEEXCEPT=1 ;;
esac
;;
- arm*-*-freebsd* | aarch64*-*-freebsd* | aarch64*-*-netbsd*)
+ arm*-*-freebsd* | aarch64*-*-freebsd* | aarch64*-*-netbsd* | \
+ *-*-mingw* | *-*-windows*)
REPLACE_FEENABLEEXCEPT=1
;;
esac
