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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])

])