On mingw, with warn-on-use.h modified to simulate a gcc >= 4.3, I'm seeing this error:
In file included from test-string-c++.cc:22: ../gllib/string.h:525: error: `stpncpy' was not declared in this scope The reason is that the 'stpncpy' module uses #define stpncpy rpl_stpncpy both in the case when the function is missing (like on mingw) and in the case where the system provide a broken one (like on AIX). Here it becomes necessary to distinguish the two cases, like we do for many other functions. 2010-04-03 Bruno Haible <br...@clisp.org> stpncpy: Fix C++ test error on mingw. * lib/string.in.h (stpncpy): Use modern idiom. * m4/stpncpy.m4 (gl_FUNC_STPNCPY): Distinguish the case that the function is missing and that it needs to be replaced. * m4/string_h.m4 (gl_HEADER_STRING_H_DEFAULTS): Initialize REPLACE_STPNCPY. * modules/string (Makefile.am): Replace REPLACE_STPNCPY. --- lib/string.in.h.orig Sat Apr 3 13:13:03 2010 +++ lib/string.in.h Sat Apr 3 13:08:01 2010 @@ -222,7 +222,7 @@ /* Copy no more than N bytes of SRC to DST, returning a pointer past the last non-NUL byte written into DST. */ #if @GNULIB_STPNCPY@ -# if ! @HAVE_STPNCPY@ +# if @REPLACE_STPNCPY@ # if !(defined __cplusplus && defined GNULIB_NAMESPACE) # define stpncpy rpl_stpncpy # endif @@ -234,6 +234,12 @@ (char *restrict __dst, char const *restrict __src, size_t __n)); # else +# if ! @HAVE_STPNCPY@ +_GL_FUNCDECL_SYS (stpncpy, char *, + (char *restrict __dst, char const *restrict __src, + size_t __n) + _GL_ARG_NONNULL ((1, 2))); +# endif _GL_CXXALIAS_SYS (stpncpy, char *, (char *restrict __dst, char const *restrict __src, size_t __n)); --- m4/stpncpy.m4.orig Sat Apr 3 13:13:03 2010 +++ m4/stpncpy.m4 Sat Apr 3 13:12:27 2010 @@ -1,4 +1,4 @@ -# stpncpy.m4 serial 10 +# stpncpy.m4 serial 11 dnl Copyright (C) 2002-2003, 2005-2007, 2009-2010 Free Software Foundation, dnl Inc. dnl This file is free software; the Free Software Foundation @@ -25,8 +25,10 @@ dnl in AIX: dest + max(0,n-1) dnl Only the glibc return value is useful in practice. - AC_CACHE_CHECK([for working stpncpy], [gl_cv_func_stpncpy], [ - AC_TRY_RUN([ + AC_CHECK_FUNCS_ONCE([stpncpy]) + if test $ac_cv_func_stpncpy = yes; then + AC_CACHE_CHECK([for working stpncpy], [gl_cv_func_stpncpy], [ + AC_TRY_RUN([ #include <stdlib.h> #include <string.h> /* for strcpy */ /* The stpncpy prototype is missing in <string.h> on AIX 4. */ @@ -45,17 +47,23 @@ if (stpncpy (dest, src, 7) != dest + 5) exit(1); exit(0); } -], gl_cv_func_stpncpy=yes, gl_cv_func_stpncpy=no, - [AC_EGREP_CPP([Thanks for using GNU], [ +], [gl_cv_func_stpncpy=yes], [gl_cv_func_stpncpy=no], + [AC_EGREP_CPP([Thanks for using GNU], [ #include <features.h> #ifdef __GNU_LIBRARY__ Thanks for using GNU #endif -], gl_cv_func_stpncpy=yes, gl_cv_func_stpncpy=no)])]) - - if test $gl_cv_func_stpncpy = yes; then - AC_DEFINE([HAVE_STPNCPY], [1], - [Define if you have the stpncpy() function and it works.]) +], [gl_cv_func_stpncpy=yes], [gl_cv_func_stpncpy=no]) + ]) + ]) + if test $gl_cv_func_stpncpy = yes; then + AC_DEFINE([HAVE_STPNCPY], [1], + [Define if you have the stpncpy() function and it works.]) + else + REPLACE_STPNCPY=1 + AC_LIBOBJ([stpncpy]) + gl_PREREQ_STPNCPY + fi else HAVE_STPNCPY=0 AC_LIBOBJ([stpncpy]) --- m4/string_h.m4.orig Sat Apr 3 13:13:03 2010 +++ m4/string_h.m4 Sat Apr 3 13:08:32 2010 @@ -5,7 +5,7 @@ # gives unlimited permission to copy and/or distribute it, # with or without modifications, as long as this notice is preserved. -# serial 13 +# serial 14 # Written by Paul Eggert. @@ -95,6 +95,7 @@ HAVE_STRVERSCMP=1; AC_SUBST([HAVE_STRVERSCMP]) REPLACE_MEMCHR=0; AC_SUBST([REPLACE_MEMCHR]) REPLACE_MEMMEM=0; AC_SUBST([REPLACE_MEMMEM]) + REPLACE_STPNCPY=0; AC_SUBST([REPLACE_STPNCPY]) REPLACE_STRDUP=0; AC_SUBST([REPLACE_STRDUP]) REPLACE_STRSTR=0; AC_SUBST([REPLACE_STRSTR]) REPLACE_STRCASESTR=0; AC_SUBST([REPLACE_STRCASESTR]) --- modules/string.orig Sat Apr 3 13:13:03 2010 +++ modules/string Sat Apr 3 13:08:51 2010 @@ -79,6 +79,7 @@ -e 's|@''HAVE_DECL_STRERROR''@|$(HAVE_DECL_STRERROR)|g' \ -e 's|@''HAVE_DECL_STRSIGNAL''@|$(HAVE_DECL_STRSIGNAL)|g' \ -e 's|@''HAVE_STRVERSCMP''@|$(HAVE_STRVERSCMP)|g' \ + -e 's|@''REPLACE_STPNCPY''@|$(REPLACE_STPNCPY)|g' \ -e 's|@''REPLACE_MEMCHR''@|$(REPLACE_MEMCHR)|g' \ -e 's|@''REPLACE_MEMMEM''@|$(REPLACE_MEMMEM)|g' \ -e 's|@''REPLACE_STRCASESTR''@|$(REPLACE_STRCASESTR)|g' \