| dnl A placeholder for ISO C99 <wchar.h>, for platforms that have issues. |
| |
| dnl Copyright (C) 2007-2010 Free Software Foundation, Inc. |
| dnl This file is free software; the Free Software Foundation |
| dnl gives unlimited permission to copy and/or distribute it, |
| dnl with or without modifications, as long as this notice is preserved. |
| |
| dnl Written by Eric Blake. |
| |
| # wchar_h.m4 serial 33 |
| |
| AC_DEFUN([gl_WCHAR_H], |
| [ |
| AC_REQUIRE([gl_WCHAR_H_DEFAULTS]) |
| AC_REQUIRE([gl_WCHAR_H_INLINE_OK]) |
| dnl Prepare for creating substitute <wchar.h>. |
| dnl Check for <wchar.h> (missing in Linux uClibc when built without wide |
| dnl character support). |
| dnl <wchar.h> is always overridden, because of GNULIB_POSIXCHECK. |
| AC_CHECK_HEADERS_ONCE([wchar.h]) |
| gl_CHECK_NEXT_HEADERS([wchar.h]) |
| if test $ac_cv_header_wchar_h = yes; then |
| HAVE_WCHAR_H=1 |
| else |
| HAVE_WCHAR_H=0 |
| fi |
| AC_SUBST([HAVE_WCHAR_H]) |
| |
| AC_REQUIRE([gt_TYPE_WINT_T]) |
| if test $gt_cv_c_wint_t = yes; then |
| HAVE_WINT_T=1 |
| else |
| HAVE_WINT_T=0 |
| fi |
| AC_SUBST([HAVE_WINT_T]) |
| |
| dnl Check for declarations of anything we want to poison if the |
| dnl corresponding gnulib module is not in use. |
| gl_WARN_ON_USE_PREPARE([[ |
| /* Some systems require additional headers. */ |
| #ifndef __GLIBC__ |
| # include <stddef.h> |
| # include <stdio.h> |
| # include <time.h> |
| #endif |
| #include <wchar.h> |
| ]], [btowc wctob mbsinit mbrtowc mbrlen mbsrtowcs mbsnrtowcs wcrtomb |
| wcsrtombs wcsnrtombs wcwidth]) |
| ]) |
| |
| dnl Check whether <wchar.h> is usable at all. |
| AC_DEFUN([gl_WCHAR_H_INLINE_OK], |
| [ |
| dnl Test whether <wchar.h> suffers due to the transition from '__inline' to |
| dnl 'gnu_inline'. See <http://sourceware.org/bugzilla/show_bug.cgi?id=4022> |
| dnl and <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42440>. In summary, |
| dnl glibc version 2.5 or older, together with gcc version 4.3 or newer and |
| dnl the option -std=c99 or -std=gnu99, leads to a broken <wchar.h>. |
| AC_CACHE_CHECK([whether <wchar.h> uses 'inline' correctly], |
| [gl_cv_header_wchar_h_correct_inline], |
| [gl_cv_header_wchar_h_correct_inline=yes |
| AC_LANG_CONFTEST([ |
| AC_LANG_SOURCE([[#define wcstod renamed_wcstod |
| #include <wchar.h> |
| extern int zero (void); |
| int main () { return zero(); } |
| ]])]) |
| if AC_TRY_EVAL([ac_compile]); then |
| mv conftest.$ac_objext conftest1.$ac_objext |
| AC_LANG_CONFTEST([ |
| AC_LANG_SOURCE([[#define wcstod renamed_wcstod |
| #include <wchar.h> |
| int zero (void) { return 0; } |
| ]])]) |
| if AC_TRY_EVAL([ac_compile]); then |
| mv conftest.$ac_objext conftest2.$ac_objext |
| if $CC -o conftest$ac_exeext $CFLAGS $LDFLAGS conftest1.$ac_objext conftest2.$ac_objext $LIBS >&AS_MESSAGE_LOG_FD 2>&1; then |
| : |
| else |
| gl_cv_header_wchar_h_correct_inline=no |
| fi |
| fi |
| fi |
| rm -f conftest1.$ac_objext conftest2.$ac_objext conftest$ac_exeext |
| ]) |
| if test $gl_cv_header_wchar_h_correct_inline = no; then |
| AC_MSG_ERROR([<wchar.h> cannot be used with this compiler ($CC $CFLAGS $CPPFLAGS). |
| This is a known interoperability problem of glibc <= 2.5 with gcc >= 4.3 in |
| C99 mode. You have four options: |
| - Add the flag -fgnu89-inline to CC and reconfigure, or |
| - Fix your include files, using parts of |
| <http://sourceware.org/git/?p=glibc.git;a=commitdiff;h=b037a293a48718af30d706c2e18c929d0e69a621>, or |
| - Use a gcc version older than 4.3, or |
| - Don't use the flags -std=c99 or -std=gnu99. |
| Configuration aborted.]) |
| fi |
| ]) |
| |
| dnl Unconditionally enables the replacement of <wchar.h>. |
| AC_DEFUN([gl_REPLACE_WCHAR_H], |
| [ |
| dnl This is a no-op, because <wchar.h> is always overridden. |
| : |
| ]) |
| |
| AC_DEFUN([gl_WCHAR_MODULE_INDICATOR], |
| [ |
| dnl Use AC_REQUIRE here, so that the default settings are expanded once only. |
| AC_REQUIRE([gl_WCHAR_H_DEFAULTS]) |
| gl_MODULE_INDICATOR_SET_VARIABLE([$1]) |
| dnl Define it also as a C macro, for the benefit of the unit tests. |
| gl_MODULE_INDICATOR_FOR_TESTS([$1]) |
| ]) |
| |
| AC_DEFUN([gl_WCHAR_H_DEFAULTS], |
| [ |
| GNULIB_BTOWC=0; AC_SUBST([GNULIB_BTOWC]) |
| GNULIB_WCTOB=0; AC_SUBST([GNULIB_WCTOB]) |
| GNULIB_MBSINIT=0; AC_SUBST([GNULIB_MBSINIT]) |
| GNULIB_MBRTOWC=0; AC_SUBST([GNULIB_MBRTOWC]) |
| GNULIB_MBRLEN=0; AC_SUBST([GNULIB_MBRLEN]) |
| GNULIB_MBSRTOWCS=0; AC_SUBST([GNULIB_MBSRTOWCS]) |
| GNULIB_MBSNRTOWCS=0; AC_SUBST([GNULIB_MBSNRTOWCS]) |
| GNULIB_WCRTOMB=0; AC_SUBST([GNULIB_WCRTOMB]) |
| GNULIB_WCSRTOMBS=0; AC_SUBST([GNULIB_WCSRTOMBS]) |
| GNULIB_WCSNRTOMBS=0; AC_SUBST([GNULIB_WCSNRTOMBS]) |
| GNULIB_WCWIDTH=0; AC_SUBST([GNULIB_WCWIDTH]) |
| dnl Assume proper GNU behavior unless another module says otherwise. |
| HAVE_BTOWC=1; AC_SUBST([HAVE_BTOWC]) |
| HAVE_MBSINIT=1; AC_SUBST([HAVE_MBSINIT]) |
| HAVE_MBRTOWC=1; AC_SUBST([HAVE_MBRTOWC]) |
| HAVE_MBRLEN=1; AC_SUBST([HAVE_MBRLEN]) |
| HAVE_MBSRTOWCS=1; AC_SUBST([HAVE_MBSRTOWCS]) |
| HAVE_MBSNRTOWCS=1; AC_SUBST([HAVE_MBSNRTOWCS]) |
| HAVE_WCRTOMB=1; AC_SUBST([HAVE_WCRTOMB]) |
| HAVE_WCSRTOMBS=1; AC_SUBST([HAVE_WCSRTOMBS]) |
| HAVE_WCSNRTOMBS=1; AC_SUBST([HAVE_WCSNRTOMBS]) |
| HAVE_DECL_WCTOB=1; AC_SUBST([HAVE_DECL_WCTOB]) |
| HAVE_DECL_WCWIDTH=1; AC_SUBST([HAVE_DECL_WCWIDTH]) |
| REPLACE_MBSTATE_T=0; AC_SUBST([REPLACE_MBSTATE_T]) |
| REPLACE_BTOWC=0; AC_SUBST([REPLACE_BTOWC]) |
| REPLACE_WCTOB=0; AC_SUBST([REPLACE_WCTOB]) |
| REPLACE_MBSINIT=0; AC_SUBST([REPLACE_MBSINIT]) |
| REPLACE_MBRTOWC=0; AC_SUBST([REPLACE_MBRTOWC]) |
| REPLACE_MBRLEN=0; AC_SUBST([REPLACE_MBRLEN]) |
| REPLACE_MBSRTOWCS=0; AC_SUBST([REPLACE_MBSRTOWCS]) |
| REPLACE_MBSNRTOWCS=0; AC_SUBST([REPLACE_MBSNRTOWCS]) |
| REPLACE_WCRTOMB=0; AC_SUBST([REPLACE_WCRTOMB]) |
| REPLACE_WCSRTOMBS=0; AC_SUBST([REPLACE_WCSRTOMBS]) |
| REPLACE_WCSNRTOMBS=0; AC_SUBST([REPLACE_WCSNRTOMBS]) |
| REPLACE_WCWIDTH=0; AC_SUBST([REPLACE_WCWIDTH]) |
| ]) |