Last week, I did this:
> * lib/stddef.in.h: In C++ mode, include <utility> and either import
> 'unreachable' from the std namespace or define it as an inline function.
Unfortunately, that does not work across platforms. On FreeBSD 14, for example,
the #include <utility> from within stddef.h (which gets included from <cstddef>)
leads to compilation errors (attached).
This patch works around the issue, by using a new macro gl_unreachable in code
that should be usable in both C and C++.
2025-06-02 Bruno Haible <br...@clisp.org>
stddef-h: Fix compilation errors in C++ mode (regression 2025-05-27).
* m4/stddef_h.m4 (gl_STDDEF_H): Set and substitute HAVE_C_UNREACHABLE.
Don't test for unreachable in <stddef.h> in C++. Set
GL_GENERATE_STDDEF_H to true always.
* lib/stddef.in.h (gl_unreachable): Renamed from _gl_unreachable. Test
HAVE_C_UNREACHABLE.
(unreachable): Don't define in C++ mode. Don't define if
HAVE_C_UNREACHABLE is 1.
* modules/stddef-h (Makefile.am): Substitute HAVE_C_UNREACHABLE.
* tests/test-stddef-h.c (test_unreachable_optimization,
test_unreachable_noreturn): Don't define in C++ mode.
(test_gl_unreachable_optimization, test_gl_unreachable_noreturn): New
functions.
* tests/test-stddef-h-c++3.cc (test_cxx_unreachable_1): Test
gl_unreachable instead of unreachable.
* lib/error.in.h (__gl_error_call1): Use gl_unreachable instead of
unreachable.
diff --git a/lib/error.in.h b/lib/error.in.h
index 24a619f4a4..6c512ec8e5 100644
--- a/lib/error.in.h
+++ b/lib/error.in.h
@@ -39,7 +39,7 @@
/* Get va_list. */
#include <stdarg.h>
-/* Get 'unreachable'. */
+/* Get 'gl_unreachable'. */
#include <stddef.h>
/* Get _GL_ATTRIBUTE_SPEC_PRINTF_STANDARD, _GL_ATTRIBUTE_SPEC_PRINTF_SYSTEM.
*/
@@ -57,11 +57,11 @@
It evaluates its arguments only once.
Test case: Compile copy-file.c with "gcc -Wimplicit-fallthrough". */
#if defined __GNUC__ || defined __clang__
-/* Use 'unreachable' to tell the compiler when the function call does not
+/* Use 'gl_unreachable' to tell the compiler when the function call does not
return. */
# define __gl_error_call1(function, status, ...) \
((function) (status, __VA_ARGS__), \
- (status) != 0 ? unreachable () : (void) 0)
+ (status) != 0 ? gl_unreachable () : (void) 0)
/* If STATUS is a not a constant, the function call may or may not return;
therefore -Wimplicit-fallthrough will produce a warning. Use a compound
statement in order to evaluate STATUS only once.
diff --git a/lib/stddef.in.h b/lib/stddef.in.h
index 2754e881e7..e8c55ff1cd 100644
--- a/lib/stddef.in.h
+++ b/lib/stddef.in.h
@@ -188,6 +188,17 @@ typedef union
#endif
/* ISO C 23 ยง 7.21.1 The unreachable macro */
+/* This macro is only usable in C, not in C++.
+ There is no way to define it as a macro in C++, because that would break
code
+ that does
+ #include <utility>
+ ... std::unreachable() ...
+ Similarly, there is no way to define it as an inline function in C++,
because
+ that would break code that does
+ #include <utility>
+ using std::unreachable;
+ As a workaround, we define a macro gl_unreachable, that is like unreachable,
+ but is usable in both C and C++. */
/* Code borrowed from verify.h. */
#ifndef _GL_HAS_BUILTIN_UNREACHABLE
@@ -203,9 +214,11 @@ typedef union
#endif
#if _GL_HAS_BUILTIN_UNREACHABLE
-# define _gl_unreachable() __builtin_unreachable ()
+# define gl_unreachable() __builtin_unreachable ()
#elif 1200 <= _MSC_VER
-# define _gl_unreachable() __assume (0)
+# define gl_unreachable() __assume (0)
+#elif !defined __cplusplus && @HAVE_C_UNREACHABLE@
+# define gl_unreachable() unreachable ()
#else
/* Declare abort(), without including <stdlib.h>. */
extern
@@ -218,36 +231,14 @@ void abort (void)
_GL_ATTRIBUTE_NOTHROW
# endif
;
-# define _gl_unreachable() abort ()
+# define gl_unreachable() abort ()
#endif
-#ifndef __cplusplus
+#if !defined __cplusplus && !@HAVE_C_UNREACHABLE@
/* In C, define unreachable as a macro. */
# ifndef unreachable
-# define unreachable() _gl_unreachable ()
-# endif
-
-#else
-/* In C++, define unreachable as an inline function. */
-
-/* With some versions of MSVC, the inclusion of <utility> here causes errors
- when <cstddef> gets included:
- type_traits(1164): error C2065: 'max_align_t': undeclared identifier */
-# if !defined _MSC_VER
-extern "C++" { /* needed for Cygwin */
-# include <utility>
-}
-# endif
-
-# if defined __cpp_lib_unreachable /* C++23 or newer */
-
-using std::unreachable;
-
-# else
-
-inline void unreachable () { _gl_unreachable (); }
-
+# define unreachable() gl_unreachable ()
# endif
#endif
diff --git a/m4/stddef_h.m4 b/m4/stddef_h.m4
index bdcb428017..127ec05b60 100644
--- a/m4/stddef_h.m4
+++ b/m4/stddef_h.m4
@@ -1,5 +1,5 @@
# stddef_h.m4
-# serial 22
+# serial 23
dnl Copyright (C) 2009-2025 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -77,32 +77,13 @@ AC_DEFUN_ONCE([gl_STDDEF_H]
])
if test $gl_cv_c_func_unreachable = no; then
GL_GENERATE_STDDEF_H=true
+ HAVE_C_UNREACHABLE=0
+ else
+ HAVE_C_UNREACHABLE=1
fi
- if test "$CXX" != no; then
- dnl C++ <utility> has std::unreachable,
- dnl see <https://en.cppreference.com/w/cpp/utility/unreachable>,
- dnl but we want an unreachable() that is available from <stddef.h>,
- dnl like in ISO C 23.
- AC_CACHE_CHECK([for unreachable in <stddef.h> in C++],
- [gl_cv_cxx_func_unreachable],
- [dnl We can't use AC_LANG_PUSH([C++]) and AC_LANG_POP([C++]) here, due to
- dnl an autoconf bug <https://savannah.gnu.org/support/?110294>.
- cat > conftest.cpp <<\EOF
-#include <stddef.h>
-int main (void) { unreachable (); }
-EOF
- gl_command="$CXX $CXXFLAGS $CPPFLAGS -c conftest.cpp"
- if AC_TRY_EVAL([gl_command]); then
- gl_cv_cxx_func_unreachable=yes
- else
- gl_cv_cxx_func_unreachable=no
- fi
- rm -fr conftest*
- ])
- if test $gl_cv_cxx_func_unreachable = no; then
- GL_GENERATE_STDDEF_H=true
- fi
- fi
+ AC_SUBST([HAVE_C_UNREACHABLE])
+ dnl Provide gl_unreachable() unconditionally.
+ GL_GENERATE_STDDEF_H=true
dnl https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114869
AC_CACHE_CHECK([whether nullptr_t needs <stddef.h>],
diff --git a/modules/stddef-h b/modules/stddef-h
index 96eeeaf88b..7f4f0c0ef6 100644
--- a/modules/stddef-h
+++ b/modules/stddef-h
@@ -34,6 +34,7 @@ stddef.h: stddef.in.h $(top_builddir)/config.status
-e 's|@''STDDEF_NOT_IDEMPOTENT''@|$(STDDEF_NOT_IDEMPOTENT)|g' \
-e 's|@''REPLACE_NULL''@|$(REPLACE_NULL)|g' \
-e 's|@''HAVE_MAX_ALIGN_T''@|$(HAVE_MAX_ALIGN_T)|g' \
+ -e 's|@''HAVE_C_UNREACHABLE''@|$(HAVE_C_UNREACHABLE)|g' \
$(srcdir)/stddef.in.h > $@-t
$(AM_V_at)mv $@-t $@
else
diff --git a/tests/test-stddef-h-c++3.cc b/tests/test-stddef-h-c++3.cc
index 77242183c8..b3b320b671 100644
--- a/tests/test-stddef-h-c++3.cc
+++ b/tests/test-stddef-h-c++3.cc
@@ -16,7 +16,7 @@
#include <config.h>
-/* Define unreachable. */
+/* Define gl_unreachable. */
#include <stddef.h>
/* Define std::unreachable (in C++23 or newer). */
#include <utility>
@@ -25,7 +25,7 @@ void
test_cxx_unreachable_1 ()
{
if (2 < 1)
- unreachable ();
+ gl_unreachable ();
#if defined __cpp_lib_unreachable
if (3 < 1)
std::unreachable ();
diff --git a/tests/test-stddef-h.c b/tests/test-stddef-h.c
index f201b411ab..b80df4d445 100644
--- a/tests/test-stddef-h.c
+++ b/tests/test-stddef-h.c
@@ -69,6 +69,11 @@ static_assert (__alignof__ (struct d) <= __alignof__
(max_align_t));
# endif
#endif
+
+#ifndef __cplusplus
+
+/* Test 'unreachable'. */
+
int test_unreachable_optimization (int x);
_Noreturn void test_unreachable_noreturn (void);
@@ -93,6 +98,36 @@ test_unreachable_noreturn (void)
unreachable ();
}
+#endif
+
+
+/* Test 'gl_unreachable'. */
+
+int test_gl_unreachable_optimization (int x);
+_Noreturn void test_gl_unreachable_noreturn (void);
+
+int
+test_gl_unreachable_optimization (int x)
+{
+ /* Check that the compiler uses 'gl_unreachable' for optimization.
+ This function, when compiled with optimization, should have code
+ equivalent to
+ return x + 3;
+ Use 'objdump --disassemble test-stddef.o' to verify this. */
+ if (x < 4)
+ gl_unreachable ();
+ return (x > 1 ? x + 3 : 2 * x + 10);
+}
+
+_Noreturn void
+test_gl_unreachable_noreturn (void)
+{
+ /* Check that the compiler's data-flow analysis recognizes
+ 'gl_unreachable ()'. This function should not elicit a warning. */
+ gl_unreachable ();
+}
+
+
#include <limits.h> /* INT_MAX */
/* offsetof promotes to an unsigned integer if and only if sizes do
gmake all-recursive
gmake[1]: Entering directory '/home/bruno/testdir-all/build'
Making all in gllib
gmake[2]: Entering directory '/home/bruno/testdir-all/build/gllib'
gmake all-recursive
gmake[3]: Entering directory '/home/bruno/testdir-all/build/gllib'
gmake[4]: Entering directory '/home/bruno/testdir-all/build/gllib'
gmake[4]: Nothing to be done for 'all-am'.
gmake[4]: Leaving directory '/home/bruno/testdir-all/build/gllib'
gmake[3]: Leaving directory '/home/bruno/testdir-all/build/gllib'
gmake[2]: Leaving directory '/home/bruno/testdir-all/build/gllib'
Making all in glm4
gmake[2]: Entering directory '/home/bruno/testdir-all/build/glm4'
gmake[2]: Nothing to be done for 'all'.
gmake[2]: Leaving directory '/home/bruno/testdir-all/build/glm4'
Making all in gltests
gmake[2]: Entering directory '/home/bruno/testdir-all/build/gltests'
## ---------------------------------------------------- ##
## ------------------- Gnulib tests ------------------- ##
## You can ignore compiler warnings in this directory. ##
## ---------------------------------------------------- ##
gmake all-recursive
gmake[3]: Entering directory '/home/bruno/testdir-all/build/gltests'
Making all in .
gmake[4]: Entering directory '/home/bruno/testdir-all/build/gltests'
depbase=`echo test-math-h-c++.o | sed 's|[^/]*$|.deps/&|;s|\.o$||'`;\
c++ -ferror-limit=0 -DHAVE_CONFIG_H -DEXEEXT=\"\" -DEXEEXT=\"\" -I. -I../../gltests -I.. -DGNULIB_STRICT_CHECKING=1 -DIN_GNULIB_TESTS=1 -I. -I../../gltests -I.. -I../../gltests/.. -I../gllib -I../../gltests/../gllib -I/home/bruno/include -I/usr/local/include -Wall -D_THREAD_SAFE -Wno-error -g -O2 -MT test-math-h-c++.o -MD -MP -MF $depbase.Tpo -c -o test-math-h-c++.o ../../gltests/test-math-h-c++.cc &&\
mv -f $depbase.Tpo $depbase.Po
In file included from ../../gltests/test-math-h-c++.cc:22:
In file included from ../gllib/math.h:46:
In file included from /usr/include/c++/v1/math.h:314:
In file included from /usr/include/c++/v1/__type_traits/promote.h:16:
In file included from /usr/include/c++/v1/cstddef:43:
In file included from ../gllib/stddef.h:240:
In file included from /usr/include/c++/v1/utility:265:
In file included from /usr/include/c++/v1/compare:145:
In file included from /usr/include/c++/v1/__compare/compare_partial_order_fallback.h:13:
In file included from /usr/include/c++/v1/__compare/partial_order.h:14:
In file included from /usr/include/c++/v1/__compare/weak_order.h:14:
In file included from /usr/include/c++/v1/__compare/strong_order.h:20:
/usr/include/c++/v1/cmath:558:5: error: use of undeclared identifier '__promote'
__promote<_A1, _A2, _A3>
^
/usr/include/c++/v1/cmath:562:22: error: no template named '__promote'
typedef typename __promote<_A1, _A2, _A3>::type __result_type;
^
/usr/include/c++/v1/cmath:566:12: error: call to 'hypot' is ambiguous
return std::hypot((__result_type)__lcpp_x, (__result_type)__lcpp_y, (__result_type)__lcpp_z);
^~~~~~~~~~
/usr/include/c++/v1/cmath:547:46: note: candidate function
inline _LIBCPP_INLINE_VISIBILITY float hypot( float __x, float __y, float __z ) { return sqrt(__x*__x + __y*__y + __z*__z); }
^
/usr/include/c++/v1/cmath:548:46: note: candidate function
inline _LIBCPP_INLINE_VISIBILITY double hypot( double __x, double __y, double __z ) { return sqrt(__x*__x + __y*__y + __z*__z); }
^
/usr/include/c++/v1/cmath:549:46: note: candidate function
inline _LIBCPP_INLINE_VISIBILITY long double hypot( long double __x, long double __y, long double __z ) { return sqrt(__x*__x + __y*__y + __z*__z); }
^
/usr/include/c++/v1/cmath:587:17: error: expected unqualified-id
return std::isnan(__lcpp_x);
^
/usr/include/math.h:103:2: note: expanded from macro 'isnan'
__fp_type_select(x, __inline_isnanf, __inline_isnan, __inline_isnanl)
^
/usr/include/math.h:80:39: note: expanded from macro '__fp_type_select'
#define __fp_type_select(x, f, d, ld) __extension__ _Generic((x), \
^
In file included from ../../gltests/test-math-h-c++.cc:22:
In file included from ../gllib/math.h:46:
In file included from /usr/include/c++/v1/math.h:314:
In file included from /usr/include/c++/v1/__type_traits/promote.h:16:
In file included from /usr/include/c++/v1/cstddef:43:
In file included from ../gllib/stddef.h:240:
In file included from /usr/include/c++/v1/utility:265:
In file included from /usr/include/c++/v1/compare:145:
In file included from /usr/include/c++/v1/__compare/compare_partial_order_fallback.h:13:
In file included from /usr/include/c++/v1/__compare/partial_order.h:14:
In file included from /usr/include/c++/v1/__compare/weak_order.h:14:
In file included from /usr/include/c++/v1/__compare/strong_order.h:20:
/usr/include/c++/v1/cmath:607:17: error: expected unqualified-id
return std::isinf(__lcpp_x);
^
/usr/include/math.h:101:18: note: expanded from macro 'isinf'
#define isinf(x) __fp_type_select(x, __isinff, __isinf, __isinfl)
^
/usr/include/math.h:80:39: note: expanded from macro '__fp_type_select'
#define __fp_type_select(x, f, d, ld) __extension__ _Generic((x), \
^
In file included from ../../gltests/test-math-h-c++.cc:22:
In file included from ../gllib/math.h:46:
In file included from /usr/include/c++/v1/math.h:314:
In file included from /usr/include/c++/v1/__type_traits/promote.h:16:
In file included from /usr/include/c++/v1/cstddef:43:
In file included from ../gllib/stddef.h:240:
In file included from /usr/include/c++/v1/utility:265:
In file included from /usr/include/c++/v1/compare:145:
In file included from /usr/include/c++/v1/__compare/compare_partial_order_fallback.h:13:
In file included from /usr/include/c++/v1/__compare/partial_order.h:14:
In file included from /usr/include/c++/v1/__compare/weak_order.h:14:
In file included from /usr/include/c++/v1/__compare/strong_order.h:20:
/usr/include/c++/v1/cmath:646:38: error: no member named '__promote' in namespace 'std'
std::__promote<_A1, _A2> >::type
~~~~~^
/usr/include/c++/v1/cmath:646:48: error: '_A1' does not refer to a value
std::__promote<_A1, _A2> >::type
^
/usr/include/c++/v1/cmath:643:17: note: declared here
template <class _A1, class _A2>
^
/usr/include/c++/v1/cmath:646:58: error: expected unqualified-id
std::__promote<_A1, _A2> >::type
^
In file included from ../../gltests/test-math-h-c++.cc:22:
In file included from ../gllib/math.h:46:
In file included from /usr/include/c++/v1/math.h:314:
In file included from /usr/include/c++/v1/__type_traits/promote.h:16:
In file included from /usr/include/c++/v1/cstddef:43:
In file included from ../gllib/stddef.h:240:
In file included from /usr/include/c++/v1/utility:277:
/usr/include/c++/v1/cstdlib:132:9: error: target of using declaration conflicts with declaration already in scope
using ::abs _LIBCPP_USING_IF_EXISTS;
^
/usr/include/stdlib.h:90:6: note: target of using declaration
int abs(int) __pure2;
^
/usr/include/c++/v1/cmath:353:1: note: conflicting declaration
using ::abs _LIBCPP_USING_IF_EXISTS;
^
In file included from ../../gltests/test-math-h-c++.cc:22:
In file included from ../gllib/math.h:46:
In file included from /usr/include/c++/v1/math.h:314:
In file included from /usr/include/c++/v1/__type_traits/promote.h:16:
In file included from /usr/include/c++/v1/cstddef:43:
In file included from ../gllib/stddef.h:240:
In file included from /usr/include/c++/v1/utility:277:
/usr/include/c++/v1/cstdlib:132:9: error: target of using declaration conflicts with declaration already in scope
using ::abs _LIBCPP_USING_IF_EXISTS;
^
/usr/include/c++/v1/stdlib.h:113:61: note: target of using declaration
_LIBCPP_NODISCARD_EXT inline _LIBCPP_INLINE_VISIBILITY long abs(long __x) _NOEXCEPT {
^
/usr/include/c++/v1/cmath:353:1: note: conflicting declaration
using ::abs _LIBCPP_USING_IF_EXISTS;
^
In file included from ../../gltests/test-math-h-c++.cc:22:
In file included from ../gllib/math.h:46:
In file included from /usr/include/c++/v1/math.h:314:
In file included from /usr/include/c++/v1/__type_traits/promote.h:16:
In file included from /usr/include/c++/v1/cstddef:43:
In file included from ../gllib/stddef.h:240:
In file included from /usr/include/c++/v1/utility:277:
/usr/include/c++/v1/cstdlib:132:9: error: target of using declaration conflicts with declaration already in scope
using ::abs _LIBCPP_USING_IF_EXISTS;
^
/usr/include/c++/v1/stdlib.h:116:66: note: target of using declaration
_LIBCPP_NODISCARD_EXT inline _LIBCPP_INLINE_VISIBILITY long long abs(long long __x) _NOEXCEPT {
^
/usr/include/c++/v1/cmath:353:1: note: conflicting declaration
using ::abs _LIBCPP_USING_IF_EXISTS;
^
In file included from ../../gltests/test-math-h-c++.cc:22:
In file included from ../gllib/math.h:46:
In file included from /usr/include/c++/v1/math.h:314:
In file included from /usr/include/c++/v1/__type_traits/promote.h:16:
In file included from /usr/include/c++/v1/cstddef:43:
In file included from ../gllib/stddef.h:240:
In file included from /usr/include/c++/v1/utility:277:
/usr/include/c++/v1/cstdlib:132:9: error: target of using declaration conflicts with declaration already in scope
using ::abs _LIBCPP_USING_IF_EXISTS;
^
/usr/include/c++/v1/stdlib.h:122:62: note: target of using declaration
_LIBCPP_NODISCARD_EXT inline _LIBCPP_INLINE_VISIBILITY float abs(float __lcpp_x) _NOEXCEPT {
^
/usr/include/c++/v1/cmath:353:1: note: conflicting declaration
using ::abs _LIBCPP_USING_IF_EXISTS;
^
In file included from ../../gltests/test-math-h-c++.cc:22:
In file included from ../gllib/math.h:46:
In file included from /usr/include/c++/v1/math.h:314:
In file included from /usr/include/c++/v1/__type_traits/promote.h:16:
In file included from /usr/include/c++/v1/cstddef:43:
In file included from ../gllib/stddef.h:240:
In file included from /usr/include/c++/v1/utility:277:
/usr/include/c++/v1/cstdlib:132:9: error: target of using declaration conflicts with declaration already in scope
using ::abs _LIBCPP_USING_IF_EXISTS;
^
/usr/include/c++/v1/stdlib.h:126:63: note: target of using declaration
_LIBCPP_NODISCARD_EXT inline _LIBCPP_INLINE_VISIBILITY double abs(double __lcpp_x) _NOEXCEPT {
^
/usr/include/c++/v1/cmath:353:1: note: conflicting declaration
using ::abs _LIBCPP_USING_IF_EXISTS;
^
In file included from ../../gltests/test-math-h-c++.cc:22:
In file included from ../gllib/math.h:46:
In file included from /usr/include/c++/v1/math.h:314:
In file included from /usr/include/c++/v1/__type_traits/promote.h:16:
In file included from /usr/include/c++/v1/cstddef:43:
In file included from ../gllib/stddef.h:240:
In file included from /usr/include/c++/v1/utility:277:
/usr/include/c++/v1/cstdlib:132:9: error: target of using declaration conflicts with declaration already in scope
using ::abs _LIBCPP_USING_IF_EXISTS;
^
/usr/include/c++/v1/stdlib.h:131:1: note: target of using declaration
abs(long double __lcpp_x) _NOEXCEPT {
^
/usr/include/c++/v1/cmath:353:1: note: conflicting declaration
using ::abs _LIBCPP_USING_IF_EXISTS;
^
../../gltests/test-math-h-c++.cc:413:4: warning: "signbit should not be a macro in C++" [-W#warnings]
# warning "signbit should not be a macro in C++"
^
1 warning and 14 errors generated.
gmake[4]: *** [Makefile:27245: test-math-h-c++.o] Error 1
depbase=`echo test-string-h-c++.o | sed 's|[^/]*$|.deps/&|;s|\.o$||'`;\
c++ -ferror-limit=0 -DHAVE_CONFIG_H -DEXEEXT=\"\" -DEXEEXT=\"\" -I. -I../../gltests -I.. -DGNULIB_STRICT_CHECKING=1 -DIN_GNULIB_TESTS=1 -I. -I../../gltests -I.. -I../../gltests/.. -I../gllib -I../../gltests/../gllib -I/home/bruno/include -I/usr/local/include -Wall -D_THREAD_SAFE -Wno-error -g -O2 -MT test-string-h-c++.o -MD -MP -MF $depbase.Tpo -c -o test-string-h-c++.o ../../gltests/test-string-h-c++.cc &&\
mv -f $depbase.Tpo $depbase.Po
In file included from ../../gltests/test-string-h-c++.cc:22:
In file included from ../gllib/string.h:41:
In file included from /usr/include/c++/v1/string.h:61:
In file included from /usr/include/string.h:46:
In file included from ../gllib/strings.h:52:
In file included from ../gllib/locale.h:54:
In file included from ../gllib/stddef.h:240:
In file included from /usr/include/c++/v1/utility:278:
In file included from /usr/include/c++/v1/iosfwd:100:
In file included from /usr/include/c++/v1/__mbstate_t.h:29:
../gllib/wchar.h:1145:3: error: use of undeclared identifier 'memset'; did you mean 'wmemset'?
memset (ps, 0, _GL_MBSTATE_ZERO_SIZE);
^
/usr/include/wchar.h:176:10: note: 'wmemset' declared here
wchar_t *wmemset(wchar_t *, wchar_t, size_t);
^
In file included from ../../gltests/test-string-h-c++.cc:22:
In file included from ../gllib/string.h:41:
In file included from /usr/include/c++/v1/string.h:61:
In file included from /usr/include/string.h:46:
In file included from ../gllib/strings.h:52:
In file included from ../gllib/locale.h:54:
In file included from ../gllib/stddef.h:240:
In file included from /usr/include/c++/v1/utility:278:
In file included from /usr/include/c++/v1/iosfwd:100:
In file included from /usr/include/c++/v1/__mbstate_t.h:29:
../gllib/wchar.h:1145:11: error: cannot initialize a parameter of type 'wchar_t *' with an lvalue of type 'mbstate_t *' (aka '__mbstate_t *')
memset (ps, 0, _GL_MBSTATE_ZERO_SIZE);
^~
/usr/include/wchar.h:176:27: note: passing argument to parameter here
wchar_t *wmemset(wchar_t *, wchar_t, size_t);
^
2 errors generated.
gmake[4]: *** [Makefile:27245: test-string-h-c++.o] Error 1
depbase=`echo test-string-h-c++2.o | sed 's|[^/]*$|.deps/&|;s|\.o$||'`;\
c++ -ferror-limit=0 -DHAVE_CONFIG_H -DEXEEXT=\"\" -DEXEEXT=\"\" -I. -I../../gltests -I.. -DGNULIB_STRICT_CHECKING=1 -DIN_GNULIB_TESTS=1 -I. -I../../gltests -I.. -I../../gltests/.. -I../gllib -I../../gltests/../gllib -I/home/bruno/include -I/usr/local/include -Wall -D_THREAD_SAFE -Wno-error -g -O2 -MT test-string-h-c++2.o -MD -MP -MF $depbase.Tpo -c -o test-string-h-c++2.o ../../gltests/test-string-h-c++2.cc &&\
mv -f $depbase.Tpo $depbase.Po
In file included from ../../gltests/test-string-h-c++2.cc:20:
In file included from /usr/include/c++/v1/cstring:63:
In file included from ../gllib/string.h:41:
In file included from /usr/include/c++/v1/string.h:61:
In file included from /usr/include/string.h:46:
In file included from ../gllib/strings.h:52:
In file included from ../gllib/locale.h:54:
In file included from ../gllib/stddef.h:240:
In file included from /usr/include/c++/v1/utility:278:
In file included from /usr/include/c++/v1/iosfwd:100:
In file included from /usr/include/c++/v1/__mbstate_t.h:29:
../gllib/wchar.h:1145:3: error: use of undeclared identifier 'memset'; did you mean 'wmemset'?
memset (ps, 0, _GL_MBSTATE_ZERO_SIZE);
^
/usr/include/wchar.h:176:10: note: 'wmemset' declared here
wchar_t *wmemset(wchar_t *, wchar_t, size_t);
^
In file included from ../../gltests/test-string-h-c++2.cc:20:
In file included from /usr/include/c++/v1/cstring:63:
In file included from ../gllib/string.h:41:
In file included from /usr/include/c++/v1/string.h:61:
In file included from /usr/include/string.h:46:
In file included from ../gllib/strings.h:52:
In file included from ../gllib/locale.h:54:
In file included from ../gllib/stddef.h:240:
In file included from /usr/include/c++/v1/utility:278:
In file included from /usr/include/c++/v1/iosfwd:100:
In file included from /usr/include/c++/v1/__mbstate_t.h:29:
../gllib/wchar.h:1145:11: error: cannot initialize a parameter of type 'wchar_t *' with an lvalue of type 'mbstate_t *' (aka '__mbstate_t *')
memset (ps, 0, _GL_MBSTATE_ZERO_SIZE);
^~
/usr/include/wchar.h:176:27: note: passing argument to parameter here
wchar_t *wmemset(wchar_t *, wchar_t, size_t);
^
2 errors generated.
gmake[4]: *** [Makefile:27245: test-string-h-c++2.o] Error 1
gmake[4]: Target 'all-am' not remade because of errors.
gmake[4]: Leaving directory '/home/bruno/testdir-all/build/gltests'
gmake[3]: *** [Makefile:27288: all-recursive] Error 1
gmake[3]: Leaving directory '/home/bruno/testdir-all/build/gltests'
gmake[2]: *** [Makefile:18253: all] Error 2
gmake[2]: Leaving directory '/home/bruno/testdir-all/build/gltests'
gmake[2]: Entering directory '/home/bruno/testdir-all/build'
gmake[2]: Leaving directory '/home/bruno/testdir-all/build'
gmake[1]: *** [Makefile:3533: all-recursive] Error 1
gmake[1]: Leaving directory '/home/bruno/testdir-all/build'
gmake: *** [Makefile:3460: all] Error 2
