dnl A placeholder for ISO C99 <wchar.h>, for platforms that have issues.

dnl Copyright (C) 2007-2020 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 45

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.

  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([gl_FEATURES_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])

  AC_REQUIRE([gl_TYPE_WINT_T_PREREQ])

  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([[

/* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before

   <wchar.h>.

   BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be

   included before <wchar.h>.  */

#if !(defined __GLIBC__ && !defined __UCLIBC__)

# include <stddef.h>

# include <stdio.h>

# include <time.h>

#endif

#include <wchar.h>

    ]],

    [btowc wctob mbsinit mbrtowc mbrlen mbsrtowcs mbsnrtowcs wcrtomb

     wcsrtombs wcsnrtombs wcwidth wmemchr wmemcmp wmemcpy wmemmove wmemset

     wcslen wcsnlen wcscpy wcpcpy wcsncpy wcpncpy wcscat wcsncat wcscmp

     wcsncmp wcscasecmp wcsncasecmp wcscoll wcsxfrm wcsdup wcschr wcsrchr

     wcscspn wcsspn wcspbrk wcsstr wcstok wcswidth wcsftime

    ])

  AC_REQUIRE([AC_C_RESTRICT])

])

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 <https://sourceware.org/bugzilla/show_bug.cgi?id=4022>

  dnl and <https://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

/* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before

   <wchar.h>.

   BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be

   included before <wchar.h>.  */

#include <stddef.h>

#include <stdio.h>

#include <time.h>

#include <wchar.h>

extern int zero (void);

int main () { return zero(); }

]])])

     dnl Do not rename the object file from conftest.$ac_objext to

     dnl conftest1.$ac_objext, as this will cause the link to fail on

     dnl z/OS when using the XPLINK object format (due to duplicate

     dnl CSECT names). Instead, temporarily redefine $ac_compile so

     dnl that the object file has the latter name from the start.

     save_ac_compile="$ac_compile"

     ac_compile=`echo "$save_ac_compile" | sed s/conftest/conftest1/`

     if echo '#include "conftest.c"' >conftest1.c &&

        AC_TRY_EVAL([ac_compile]); then

       AC_LANG_CONFTEST([

         AC_LANG_SOURCE([[#define wcstod renamed_wcstod

/* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before

   <wchar.h>.

   BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be

   included before <wchar.h>.  */

#include <stddef.h>

#include <stdio.h>

#include <time.h>

#include <wchar.h>

int zero (void) { return 0; }

]])])

       dnl See note above about renaming object files.

       ac_compile=`echo "$save_ac_compile" | sed s/conftest/conftest2/`

       if echo '#include "conftest.c"' >conftest2.c &&

          AC_TRY_EVAL([ac_compile]); then

         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

     ac_compile="$save_ac_compile"

     rm -f conftest[12].c conftest[12].$ac_objext conftest$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

    <https://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

])

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])

  GNULIB_WMEMCHR=0;     AC_SUBST([GNULIB_WMEMCHR])

  GNULIB_WMEMCMP=0;     AC_SUBST([GNULIB_WMEMCMP])

  GNULIB_WMEMCPY=0;     AC_SUBST([GNULIB_WMEMCPY])

  GNULIB_WMEMMOVE=0;    AC_SUBST([GNULIB_WMEMMOVE])

  GNULIB_WMEMSET=0;     AC_SUBST([GNULIB_WMEMSET])

  GNULIB_WCSLEN=0;      AC_SUBST([GNULIB_WCSLEN])

  GNULIB_WCSNLEN=0;     AC_SUBST([GNULIB_WCSNLEN])

  GNULIB_WCSCPY=0;      AC_SUBST([GNULIB_WCSCPY])

  GNULIB_WCPCPY=0;      AC_SUBST([GNULIB_WCPCPY])

  GNULIB_WCSNCPY=0;     AC_SUBST([GNULIB_WCSNCPY])

  GNULIB_WCPNCPY=0;     AC_SUBST([GNULIB_WCPNCPY])

  GNULIB_WCSCAT=0;      AC_SUBST([GNULIB_WCSCAT])

  GNULIB_WCSNCAT=0;     AC_SUBST([GNULIB_WCSNCAT])

  GNULIB_WCSCMP=0;      AC_SUBST([GNULIB_WCSCMP])

  GNULIB_WCSNCMP=0;     AC_SUBST([GNULIB_WCSNCMP])

  GNULIB_WCSCASECMP=0;  AC_SUBST([GNULIB_WCSCASECMP])

  GNULIB_WCSNCASECMP=0; AC_SUBST([GNULIB_WCSNCASECMP])

  GNULIB_WCSCOLL=0;     AC_SUBST([GNULIB_WCSCOLL])

  GNULIB_WCSXFRM=0;     AC_SUBST([GNULIB_WCSXFRM])

  GNULIB_WCSDUP=0;      AC_SUBST([GNULIB_WCSDUP])

  GNULIB_WCSCHR=0;      AC_SUBST([GNULIB_WCSCHR])

  GNULIB_WCSRCHR=0;     AC_SUBST([GNULIB_WCSRCHR])

  GNULIB_WCSCSPN=0;     AC_SUBST([GNULIB_WCSCSPN])

  GNULIB_WCSSPN=0;      AC_SUBST([GNULIB_WCSSPN])

  GNULIB_WCSPBRK=0;     AC_SUBST([GNULIB_WCSPBRK])

  GNULIB_WCSSTR=0;      AC_SUBST([GNULIB_WCSSTR])

  GNULIB_WCSTOK=0;      AC_SUBST([GNULIB_WCSTOK])

  GNULIB_WCSWIDTH=0;    AC_SUBST([GNULIB_WCSWIDTH])

  GNULIB_WCSFTIME=0;    AC_SUBST([GNULIB_WCSFTIME])

  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_WMEMCHR=1;       AC_SUBST([HAVE_WMEMCHR])

  HAVE_WMEMCMP=1;       AC_SUBST([HAVE_WMEMCMP])

  HAVE_WMEMCPY=1;       AC_SUBST([HAVE_WMEMCPY])

  HAVE_WMEMMOVE=1;      AC_SUBST([HAVE_WMEMMOVE])

  HAVE_WMEMSET=1;       AC_SUBST([HAVE_WMEMSET])

  HAVE_WCSLEN=1;        AC_SUBST([HAVE_WCSLEN])

  HAVE_WCSNLEN=1;       AC_SUBST([HAVE_WCSNLEN])

  HAVE_WCSCPY=1;        AC_SUBST([HAVE_WCSCPY])

  HAVE_WCPCPY=1;        AC_SUBST([HAVE_WCPCPY])

  HAVE_WCSNCPY=1;       AC_SUBST([HAVE_WCSNCPY])

  HAVE_WCPNCPY=1;       AC_SUBST([HAVE_WCPNCPY])

  HAVE_WCSCAT=1;        AC_SUBST([HAVE_WCSCAT])

  HAVE_WCSNCAT=1;       AC_SUBST([HAVE_WCSNCAT])

  HAVE_WCSCMP=1;        AC_SUBST([HAVE_WCSCMP])

  HAVE_WCSNCMP=1;       AC_SUBST([HAVE_WCSNCMP])

  HAVE_WCSCASECMP=1;    AC_SUBST([HAVE_WCSCASECMP])

  HAVE_WCSNCASECMP=1;   AC_SUBST([HAVE_WCSNCASECMP])

  HAVE_WCSCOLL=1;       AC_SUBST([HAVE_WCSCOLL])

  HAVE_WCSXFRM=1;       AC_SUBST([HAVE_WCSXFRM])

  HAVE_WCSDUP=1;        AC_SUBST([HAVE_WCSDUP])

  HAVE_WCSCHR=1;        AC_SUBST([HAVE_WCSCHR])

  HAVE_WCSRCHR=1;       AC_SUBST([HAVE_WCSRCHR])

  HAVE_WCSCSPN=1;       AC_SUBST([HAVE_WCSCSPN])

  HAVE_WCSSPN=1;        AC_SUBST([HAVE_WCSSPN])

  HAVE_WCSPBRK=1;       AC_SUBST([HAVE_WCSPBRK])

  HAVE_WCSSTR=1;        AC_SUBST([HAVE_WCSSTR])

  HAVE_WCSTOK=1;        AC_SUBST([HAVE_WCSTOK])

  HAVE_WCSWIDTH=1;      AC_SUBST([HAVE_WCSWIDTH])

  HAVE_WCSFTIME=1;      AC_SUBST([HAVE_WCSFTIME])

  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])

  REPLACE_WCSWIDTH=0;   AC_SUBST([REPLACE_WCSWIDTH])

  REPLACE_WCSFTIME=0;   AC_SUBST([REPLACE_WCSFTIME])

  REPLACE_WCSTOK=0;     AC_SUBST([REPLACE_WCSTOK])

])