[libcxx-commits] [libcxx] c040f77 - [libcxx][FreeBSD] Add comments for unsupported xopen_source.gen.py test (#216002)

[via libcxx-commits]

Author: aokblast
Date: 2026-08-24T13:15:29+08:00
New Revision: c040f77536e68a68feb37008321512e2d3b400ef

URL: https://github.com/llvm/llvm-project/commit/c040f77536e68a68feb37008321512e2d3b400ef
DIFF: https://github.com/llvm/llvm-project/commit/c040f77536e68a68feb37008321512e2d3b400ef.diff

LOG: [libcxx][FreeBSD] Add comments for unsupported xopen_source.gen.py test (#216002)

FreeBSD _XOPEN_SOURCE == 500 does not satisfy some requirements in
libcxx. As a result, tests fail when trying to find the declarations of
these functions.

Added: 
    

Modified: 
    libcxx/test/extensions/posix/xopen_source.gen.py

Removed: 
    


################################################################################
diff  --git a/libcxx/test/extensions/posix/xopen_source.gen.py b/libcxx/test/extensions/posix/xopen_source.gen.py
index 99e0b0b7c7d1f..ac04e38bde38a 100644
--- a/libcxx/test/extensions/posix/xopen_source.gen.py
+++ b/libcxx/test/extensions/posix/xopen_source.gen.py
@@ -16,8 +16,10 @@
 # recent value of _XOPEN_SOURCE.
 # UNSUPPORTED: LIBCXX-AIX-FIXME
 
-# This test fails on FreeBSD for an unknown reason.
-# UNSUPPORTED: LIBCXX-FREEBSD-FIXME
+# FreeBSD maps _XOPEN_SOURCE=500 to __ISO_C_VISIBLE=1990 (see <sys/_visible.h>), which hides
+# everything C99 added to the C library, even in C++ mode. libc++ needs some of those
+# additions to provide a conforming library at all.
+# UNSUPPORTED: freebsd
 
 # RUN: %{python} %s %{libcxx-dir}/utils
 # END.