The clang warning option -Wthread-safety is useful for some modules
(see <https://lists.gnu.org/archive/html/bug-gnulib/2024-09/msg00130.html>).
Since it is not part of -Wall, it makes sense to enable it through the
'manywarnings' module.
This patch does it. It has no effect for GCC, since GCC does not support
this option.
2024-09-25 Bruno Haible <br...@clisp.org>
manywarnings: Enable -Wthread-safety for clang.
* m4/manywarnings.m4 (gl_MANYWARN_ALL_GCC(C)): Enable -Wthread-safety
if supported.
diff --git a/m4/manywarnings.m4 b/m4/manywarnings.m4
index 5b0baee205..3ccf405d2a 100644
--- a/m4/manywarnings.m4
+++ b/m4/manywarnings.m4
@@ -1,5 +1,5 @@
# manywarnings.m4
-# serial 27
+# serial 28
dnl Copyright (C) 2008-2024 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -185,6 +185,9 @@ AC_DEFUN([gl_MANYWARN_ALL_GCC(C
esac
fi
+ # These options are not supported by gcc, but are useful with clang.
+ AS_VAR_APPEND([$1], [' -Wthread-safety'])
+
# Disable specific options as needed.
if test "$gl_cv_cc_nomfi_needed" = yes; then
AS_VAR_APPEND([$1], [' -Wno-missing-field-initializers'])
