Re: setlocale: Silence a -Wdiscarded-qualifiers warning on Windows.

Oops, the localeconv change leads to a compilation error on mingw:

x86_64-w64-mingw32-gcc -Wno-error -Wno-error -g -O2   -o test-locale-h.exe test-locale-h.o libtests.a ../gllib/libgnu.a libtests.a ../gllib/libgnu.a libtests.a  -lbacktrace
depbase=`echo test-localeconv.o | sed 's|[^/]*$|.deps/&|;s|\.o$||'`;\
x86_64-w64-mingw32-gcc -DHAVE_CONFIG_H -DEXEEXT=\".exe\" -DEXEEXT=\".exe\" -I. -I../../gltests -I..  -DGNULIB_STRICT_CHECKING=1 -DIN_GNULIB_TESTS=1 -I. -I../../gltests -I.. -I../../gltests/.. -I../gllib -I../../gltests/../gllib -Wall -DCONTINUE_AFTER_ASSERT -Wno-error -Wno-error -g -O2 -MT test-localeconv.o -MD -MP -MF $depbase.Tpo -c -o test-localeconv.o ../../gltests/test-localeconv.c &&\
mv -f $depbase.Tpo $depbase.Po
../../gltests/test-localeconv.c:24:30: error: #if with no expression
   24 | #if GNULIB_defined_localeconv
      |                              ^
../../gltests/test-localeconv.c:27:1: warning: initialization of 'struct rpl_lconv * (*)(void)' from incompatible pointer type 'const struct rpl_lconv * (*)(void)' [-Wincompatible-pointer-types]
   27 | SIGNATURE_CHECK (localeconv, struct lconv *, (void));
      | ^~~~~~~~~~~~~~~
make[4]: *** [Makefile:27716: test-localeconv.o] Error 1

This patch should fix it.


2026-06-15  Bruno Haible  <[email protected]>

	localeconv: Fix compilation error on mingw (regression 2026-06-08).
	* lib/locale.in.h (GNULIB_defined_localeconv): Define to 1, not empty.

diff --git a/lib/locale.in.h b/lib/locale.in.h
index cdc3aab14f..e20d4fa5ff 100644
--- a/lib/locale.in.h
+++ b/lib/locale.in.h
@@ -251,7 +251,7 @@ struct lconv
 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 #   undef localeconv
 #   define localeconv rpl_localeconv
-#   define GNULIB_defined_localeconv
+#   define GNULIB_defined_localeconv 1
 #  endif
 _GL_FUNCDECL_RPL (localeconv, const struct lconv *, (void), );
 _GL_CXXALIAS_RPL (localeconv, const struct lconv *, (void));