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Diffstat (limited to 'gl/m4/wchar_h.m4')
| -rw-r--r-- | gl/m4/wchar_h.m4 | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/gl/m4/wchar_h.m4 b/gl/m4/wchar_h.m4 new file mode 100644 index 0000000..0bce51c --- /dev/null +++ b/gl/m4/wchar_h.m4 @@ -0,0 +1,152 @@ +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 32 + +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]) + GNULIB_[]m4_translit([$1],[abcdefghijklmnopqrstuvwxyz./-],[ABCDEFGHIJKLMNOPQRSTUVWXYZ___])=1 + dnl Define it also as a C macro, for the benefit of the unit tests. + gl_MODULE_INDICATOR([$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]) +]) |