gnulib/import/m4/wchar_h.m4

   1 dnl A placeholder for ISO C99 <wchar.h>, for platforms that have issues.
   2
   3 dnl Copyright (C) 2007-2016 Free Software Foundation, Inc.
   4 dnl This file is free software; the Free Software Foundation
   5 dnl gives unlimited permission to copy and/or distribute it,
   6 dnl with or without modifications, as long as this notice is preserved.
   7
   8 dnl Written by Eric Blake.
   9
  10 # wchar_h.m4 serial 40
  11
  12 AC_DEFUN([gl_WCHAR_H],
  13 [
  14   AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
  15   AC_REQUIRE([gl_WCHAR_H_INLINE_OK])
  16   dnl Prepare for creating substitute <wchar.h>.
  17   dnl Check for <wchar.h> (missing in Linux uClibc when built without wide
  18   dnl character support).
  19   dnl <wchar.h> is always overridden, because of GNULIB_POSIXCHECK.
  20   gl_CHECK_NEXT_HEADERS([wchar.h])
  21   if test $ac_cv_header_wchar_h = yes; then
  22     HAVE_WCHAR_H=1
  23   else
  24     HAVE_WCHAR_H=0
  25   fi
  26   AC_SUBST([HAVE_WCHAR_H])
  27
  28   AC_REQUIRE([gl_FEATURES_H])
  29
  30   AC_REQUIRE([gt_TYPE_WINT_T])
  31   if test $gt_cv_c_wint_t = yes; then
  32     HAVE_WINT_T=1
  33   else
  34     HAVE_WINT_T=0
  35   fi
  36   AC_SUBST([HAVE_WINT_T])
  37
  38   dnl Check for declarations of anything we want to poison if the
  39   dnl corresponding gnulib module is not in use.
  40   gl_WARN_ON_USE_PREPARE([[
  41 /* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
  42    <wchar.h>.
  43    BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be
  44    included before <wchar.h>.  */
  45 #if !(defined __GLIBC__ && !defined __UCLIBC__)
  46 # include <stddef.h>
  47 # include <stdio.h>
  48 # include <time.h>
  49 #endif
  50 #include <wchar.h>
  51     ]],
  52     [btowc wctob mbsinit mbrtowc mbrlen mbsrtowcs mbsnrtowcs wcrtomb
  53      wcsrtombs wcsnrtombs wcwidth wmemchr wmemcmp wmemcpy wmemmove wmemset
  54      wcslen wcsnlen wcscpy wcpcpy wcsncpy wcpncpy wcscat wcsncat wcscmp
  55      wcsncmp wcscasecmp wcsncasecmp wcscoll wcsxfrm wcsdup wcschr wcsrchr
  56      wcscspn wcsspn wcspbrk wcsstr wcstok wcswidth
  57     ])
  58 ])
  59
  60 dnl Check whether <wchar.h> is usable at all.
  61 AC_DEFUN([gl_WCHAR_H_INLINE_OK],
  62 [
  63   dnl Test whether <wchar.h> suffers due to the transition from '__inline' to
  64   dnl 'gnu_inline'. See <http://sourceware.org/bugzilla/show_bug.cgi?id=4022>
  65   dnl and <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42440>. In summary,
  66   dnl glibc version 2.5 or older, together with gcc version 4.3 or newer and
  67   dnl the option -std=c99 or -std=gnu99, leads to a broken <wchar.h>.
  68   AC_CACHE_CHECK([whether <wchar.h> uses 'inline' correctly],
  69     [gl_cv_header_wchar_h_correct_inline],
  70     [gl_cv_header_wchar_h_correct_inline=yes
  71      AC_LANG_CONFTEST([
  72        AC_LANG_SOURCE([[#define wcstod renamed_wcstod
  73 /* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
  74    <wchar.h>.
  75    BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be
  76    included before <wchar.h>.  */
  77 #include <stddef.h>
  78 #include <stdio.h>
  79 #include <time.h>
  80 #include <wchar.h>
  81 extern int zero (void);
  82 int main () { return zero(); }
  83 ]])])
  84      dnl Do not rename the object file from conftest.$ac_objext to
  85      dnl conftest1.$ac_objext, as this will cause the link to fail on
  86      dnl z/OS when using the XPLINK object format (due to duplicate
  87      dnl CSECT names). Instead, temporarily redefine $ac_compile so
  88      dnl that the object file has the latter name from the start.
  89      save_ac_compile="$ac_compile"
  90      ac_compile=`echo "$save_ac_compile" | sed s/conftest/conftest1/`
  91      if AC_TRY_EVAL([ac_compile]); then
  92        AC_LANG_CONFTEST([
  93          AC_LANG_SOURCE([[#define wcstod renamed_wcstod
  94 /* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
  95    <wchar.h>.
  96    BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be
  97    included before <wchar.h>.  */
  98 #include <stddef.h>
  99 #include <stdio.h>
 100 #include <time.h>
 101 #include <wchar.h>
 102 int zero (void) { return 0; }
 103 ]])])
 104        dnl See note above about renaming object files.
 105        ac_compile=`echo "$save_ac_compile" | sed s/conftest/conftest2/`
 106        if AC_TRY_EVAL([ac_compile]); then
 107          if $CC -o conftest$ac_exeext $CFLAGS $LDFLAGS conftest1.$ac_objext conftest2.$ac_objext $LIBS >&AS_MESSAGE_LOG_FD 2>&1; then
 108            :
 109          else
 110            gl_cv_header_wchar_h_correct_inline=no
 111          fi
 112        fi
 113      fi
 114      ac_compile="$save_ac_compile"
 115      rm -f conftest1.$ac_objext conftest2.$ac_objext conftest$ac_exeext
 116     ])
 117   if test $gl_cv_header_wchar_h_correct_inline = no; then
 118     AC_MSG_ERROR([<wchar.h> cannot be used with this compiler ($CC $CFLAGS $CPPFLAGS).
 119 This is a known interoperability problem of glibc <= 2.5 with gcc >= 4.3 in
 120 C99 mode. You have four options:
 121   - Add the flag -fgnu89-inline to CC and reconfigure, or
 122   - Fix your include files, using parts of
 123     <http://sourceware.org/git/?p=glibc.git;a=commitdiff;h=b037a293a48718af30d706c2e18c929d0e69a621>, or
 124   - Use a gcc version older than 4.3, or
 125   - Don't use the flags -std=c99 or -std=gnu99.
 126 Configuration aborted.])
 127   fi
 128 ])
 129
 130 AC_DEFUN([gl_WCHAR_MODULE_INDICATOR],
 131 [
 132   dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
 133   AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
 134   gl_MODULE_INDICATOR_SET_VARIABLE([$1])
 135   dnl Define it also as a C macro, for the benefit of the unit tests.
 136   gl_MODULE_INDICATOR_FOR_TESTS([$1])
 137 ])
 138
 139 AC_DEFUN([gl_WCHAR_H_DEFAULTS],
 140 [
 141   GNULIB_BTOWC=0;       AC_SUBST([GNULIB_BTOWC])
 142   GNULIB_WCTOB=0;       AC_SUBST([GNULIB_WCTOB])
 143   GNULIB_MBSINIT=0;     AC_SUBST([GNULIB_MBSINIT])
 144   GNULIB_MBRTOWC=0;     AC_SUBST([GNULIB_MBRTOWC])
 145   GNULIB_MBRLEN=0;      AC_SUBST([GNULIB_MBRLEN])
 146   GNULIB_MBSRTOWCS=0;   AC_SUBST([GNULIB_MBSRTOWCS])
 147   GNULIB_MBSNRTOWCS=0;  AC_SUBST([GNULIB_MBSNRTOWCS])
 148   GNULIB_WCRTOMB=0;     AC_SUBST([GNULIB_WCRTOMB])
 149   GNULIB_WCSRTOMBS=0;   AC_SUBST([GNULIB_WCSRTOMBS])
 150   GNULIB_WCSNRTOMBS=0;  AC_SUBST([GNULIB_WCSNRTOMBS])
 151   GNULIB_WCWIDTH=0;     AC_SUBST([GNULIB_WCWIDTH])
 152   GNULIB_WMEMCHR=0;     AC_SUBST([GNULIB_WMEMCHR])
 153   GNULIB_WMEMCMP=0;     AC_SUBST([GNULIB_WMEMCMP])
 154   GNULIB_WMEMCPY=0;     AC_SUBST([GNULIB_WMEMCPY])
 155   GNULIB_WMEMMOVE=0;    AC_SUBST([GNULIB_WMEMMOVE])
 156   GNULIB_WMEMSET=0;     AC_SUBST([GNULIB_WMEMSET])
 157   GNULIB_WCSLEN=0;      AC_SUBST([GNULIB_WCSLEN])
 158   GNULIB_WCSNLEN=0;     AC_SUBST([GNULIB_WCSNLEN])
 159   GNULIB_WCSCPY=0;      AC_SUBST([GNULIB_WCSCPY])
 160   GNULIB_WCPCPY=0;      AC_SUBST([GNULIB_WCPCPY])
 161   GNULIB_WCSNCPY=0;     AC_SUBST([GNULIB_WCSNCPY])
 162   GNULIB_WCPNCPY=0;     AC_SUBST([GNULIB_WCPNCPY])
 163   GNULIB_WCSCAT=0;      AC_SUBST([GNULIB_WCSCAT])
 164   GNULIB_WCSNCAT=0;     AC_SUBST([GNULIB_WCSNCAT])
 165   GNULIB_WCSCMP=0;      AC_SUBST([GNULIB_WCSCMP])
 166   GNULIB_WCSNCMP=0;     AC_SUBST([GNULIB_WCSNCMP])
 167   GNULIB_WCSCASECMP=0;  AC_SUBST([GNULIB_WCSCASECMP])
 168   GNULIB_WCSNCASECMP=0; AC_SUBST([GNULIB_WCSNCASECMP])
 169   GNULIB_WCSCOLL=0;     AC_SUBST([GNULIB_WCSCOLL])
 170   GNULIB_WCSXFRM=0;     AC_SUBST([GNULIB_WCSXFRM])
 171   GNULIB_WCSDUP=0;      AC_SUBST([GNULIB_WCSDUP])
 172   GNULIB_WCSCHR=0;      AC_SUBST([GNULIB_WCSCHR])
 173   GNULIB_WCSRCHR=0;     AC_SUBST([GNULIB_WCSRCHR])
 174   GNULIB_WCSCSPN=0;     AC_SUBST([GNULIB_WCSCSPN])
 175   GNULIB_WCSSPN=0;      AC_SUBST([GNULIB_WCSSPN])
 176   GNULIB_WCSPBRK=0;     AC_SUBST([GNULIB_WCSPBRK])
 177   GNULIB_WCSSTR=0;      AC_SUBST([GNULIB_WCSSTR])
 178   GNULIB_WCSTOK=0;      AC_SUBST([GNULIB_WCSTOK])
 179   GNULIB_WCSWIDTH=0;    AC_SUBST([GNULIB_WCSWIDTH])
 180   dnl Assume proper GNU behavior unless another module says otherwise.
 181   HAVE_BTOWC=1;         AC_SUBST([HAVE_BTOWC])
 182   HAVE_MBSINIT=1;       AC_SUBST([HAVE_MBSINIT])
 183   HAVE_MBRTOWC=1;       AC_SUBST([HAVE_MBRTOWC])
 184   HAVE_MBRLEN=1;        AC_SUBST([HAVE_MBRLEN])
 185   HAVE_MBSRTOWCS=1;     AC_SUBST([HAVE_MBSRTOWCS])
 186   HAVE_MBSNRTOWCS=1;    AC_SUBST([HAVE_MBSNRTOWCS])
 187   HAVE_WCRTOMB=1;       AC_SUBST([HAVE_WCRTOMB])
 188   HAVE_WCSRTOMBS=1;     AC_SUBST([HAVE_WCSRTOMBS])
 189   HAVE_WCSNRTOMBS=1;    AC_SUBST([HAVE_WCSNRTOMBS])
 190   HAVE_WMEMCHR=1;       AC_SUBST([HAVE_WMEMCHR])
 191   HAVE_WMEMCMP=1;       AC_SUBST([HAVE_WMEMCMP])
 192   HAVE_WMEMCPY=1;       AC_SUBST([HAVE_WMEMCPY])
 193   HAVE_WMEMMOVE=1;      AC_SUBST([HAVE_WMEMMOVE])
 194   HAVE_WMEMSET=1;       AC_SUBST([HAVE_WMEMSET])
 195   HAVE_WCSLEN=1;        AC_SUBST([HAVE_WCSLEN])
 196   HAVE_WCSNLEN=1;       AC_SUBST([HAVE_WCSNLEN])
 197   HAVE_WCSCPY=1;        AC_SUBST([HAVE_WCSCPY])
 198   HAVE_WCPCPY=1;        AC_SUBST([HAVE_WCPCPY])
 199   HAVE_WCSNCPY=1;       AC_SUBST([HAVE_WCSNCPY])
 200   HAVE_WCPNCPY=1;       AC_SUBST([HAVE_WCPNCPY])
 201   HAVE_WCSCAT=1;        AC_SUBST([HAVE_WCSCAT])
 202   HAVE_WCSNCAT=1;       AC_SUBST([HAVE_WCSNCAT])
 203   HAVE_WCSCMP=1;        AC_SUBST([HAVE_WCSCMP])
 204   HAVE_WCSNCMP=1;       AC_SUBST([HAVE_WCSNCMP])
 205   HAVE_WCSCASECMP=1;    AC_SUBST([HAVE_WCSCASECMP])
 206   HAVE_WCSNCASECMP=1;   AC_SUBST([HAVE_WCSNCASECMP])
 207   HAVE_WCSCOLL=1;       AC_SUBST([HAVE_WCSCOLL])
 208   HAVE_WCSXFRM=1;       AC_SUBST([HAVE_WCSXFRM])
 209   HAVE_WCSDUP=1;        AC_SUBST([HAVE_WCSDUP])
 210   HAVE_WCSCHR=1;        AC_SUBST([HAVE_WCSCHR])
 211   HAVE_WCSRCHR=1;       AC_SUBST([HAVE_WCSRCHR])
 212   HAVE_WCSCSPN=1;       AC_SUBST([HAVE_WCSCSPN])
 213   HAVE_WCSSPN=1;        AC_SUBST([HAVE_WCSSPN])
 214   HAVE_WCSPBRK=1;       AC_SUBST([HAVE_WCSPBRK])
 215   HAVE_WCSSTR=1;        AC_SUBST([HAVE_WCSSTR])
 216   HAVE_WCSTOK=1;        AC_SUBST([HAVE_WCSTOK])
 217   HAVE_WCSWIDTH=1;      AC_SUBST([HAVE_WCSWIDTH])
 218   HAVE_DECL_WCTOB=1;    AC_SUBST([HAVE_DECL_WCTOB])
 219   HAVE_DECL_WCWIDTH=1;  AC_SUBST([HAVE_DECL_WCWIDTH])
 220   REPLACE_MBSTATE_T=0;  AC_SUBST([REPLACE_MBSTATE_T])
 221   REPLACE_BTOWC=0;      AC_SUBST([REPLACE_BTOWC])
 222   REPLACE_WCTOB=0;      AC_SUBST([REPLACE_WCTOB])
 223   REPLACE_MBSINIT=0;    AC_SUBST([REPLACE_MBSINIT])
 224   REPLACE_MBRTOWC=0;    AC_SUBST([REPLACE_MBRTOWC])
 225   REPLACE_MBRLEN=0;     AC_SUBST([REPLACE_MBRLEN])
 226   REPLACE_MBSRTOWCS=0;  AC_SUBST([REPLACE_MBSRTOWCS])
 227   REPLACE_MBSNRTOWCS=0; AC_SUBST([REPLACE_MBSNRTOWCS])
 228   REPLACE_WCRTOMB=0;    AC_SUBST([REPLACE_WCRTOMB])
 229   REPLACE_WCSRTOMBS=0;  AC_SUBST([REPLACE_WCSRTOMBS])
 230   REPLACE_WCSNRTOMBS=0; AC_SUBST([REPLACE_WCSNRTOMBS])
 231   REPLACE_WCWIDTH=0;    AC_SUBST([REPLACE_WCWIDTH])
 232   REPLACE_WCSWIDTH=0;   AC_SUBST([REPLACE_WCSWIDTH])
 233 ])