m4/wchar_h.m4

   1 dnl A placeholder for ISO C99 <wchar.h>, for platforms that have issues.
   2
   3 dnl Copyright (C) 2007-2011 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 38
  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      if AC_TRY_EVAL([ac_compile]); then
  85        mv conftest.$ac_objext conftest1.$ac_objext
  86        AC_LANG_CONFTEST([
  87          AC_LANG_SOURCE([[#define wcstod renamed_wcstod
  88 /* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
  89    <wchar.h>.
  90    BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be
  91    included before <wchar.h>.  */
  92 #include <stddef.h>
  93 #include <stdio.h>
  94 #include <time.h>
  95 #include <wchar.h>
  96 int zero (void) { return 0; }
  97 ]])])
  98        if AC_TRY_EVAL([ac_compile]); then
  99          mv conftest.$ac_objext conftest2.$ac_objext
 100          if $CC -o conftest$ac_exeext $CFLAGS $LDFLAGS conftest1.$ac_objext conftest2.$ac_objext $LIBS >&AS_MESSAGE_LOG_FD 2>&1; then
 101            :
 102          else
 103            gl_cv_header_wchar_h_correct_inline=no
 104          fi
 105        fi
 106      fi
 107      rm -f conftest1.$ac_objext conftest2.$ac_objext conftest$ac_exeext
 108     ])
 109   if test $gl_cv_header_wchar_h_correct_inline = no; then
 110     AC_MSG_ERROR([<wchar.h> cannot be used with this compiler ($CC $CFLAGS $CPPFLAGS).
 111 This is a known interoperability problem of glibc <= 2.5 with gcc >= 4.3 in
 112 C99 mode. You have four options:
 113   - Add the flag -fgnu89-inline to CC and reconfigure, or
 114   - Fix your include files, using parts of
 115     <http://sourceware.org/git/?p=glibc.git;a=commitdiff;h=b037a293a48718af30d706c2e18c929d0e69a621>, or
 116   - Use a gcc version older than 4.3, or
 117   - Don't use the flags -std=c99 or -std=gnu99.
 118 Configuration aborted.])
 119   fi
 120 ])
 121
 122 dnl Unconditionally enables the replacement of <wchar.h>.
 123 AC_DEFUN([gl_REPLACE_WCHAR_H],
 124 [
 125   dnl This is a no-op, because <wchar.h> is always overridden.
 126   :
 127 ])
 128
 129 AC_DEFUN([gl_WCHAR_MODULE_INDICATOR],
 130 [
 131   dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
 132   AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
 133   gl_MODULE_INDICATOR_SET_VARIABLE([$1])
 134   dnl Define it also as a C macro, for the benefit of the unit tests.
 135   gl_MODULE_INDICATOR_FOR_TESTS([$1])
 136 ])
 137
 138 AC_DEFUN([gl_WCHAR_H_DEFAULTS],
 139 [
 140   GNULIB_BTOWC=0;       AC_SUBST([GNULIB_BTOWC])
 141   GNULIB_WCTOB=0;       AC_SUBST([GNULIB_WCTOB])
 142   GNULIB_MBSINIT=0;     AC_SUBST([GNULIB_MBSINIT])
 143   GNULIB_MBRTOWC=0;     AC_SUBST([GNULIB_MBRTOWC])
 144   GNULIB_MBRLEN=0;      AC_SUBST([GNULIB_MBRLEN])
 145   GNULIB_MBSRTOWCS=0;   AC_SUBST([GNULIB_MBSRTOWCS])
 146   GNULIB_MBSNRTOWCS=0;  AC_SUBST([GNULIB_MBSNRTOWCS])
 147   GNULIB_WCRTOMB=0;     AC_SUBST([GNULIB_WCRTOMB])
 148   GNULIB_WCSRTOMBS=0;   AC_SUBST([GNULIB_WCSRTOMBS])
 149   GNULIB_WCSNRTOMBS=0;  AC_SUBST([GNULIB_WCSNRTOMBS])
 150   GNULIB_WCWIDTH=0;     AC_SUBST([GNULIB_WCWIDTH])
 151   GNULIB_WMEMCHR=0;     AC_SUBST([GNULIB_WMEMCHR])
 152   GNULIB_WMEMCMP=0;     AC_SUBST([GNULIB_WMEMCMP])
 153   GNULIB_WMEMCPY=0;     AC_SUBST([GNULIB_WMEMCPY])
 154   GNULIB_WMEMMOVE=0;    AC_SUBST([GNULIB_WMEMMOVE])
 155   GNULIB_WMEMSET=0;     AC_SUBST([GNULIB_WMEMSET])
 156   GNULIB_WCSLEN=0;      AC_SUBST([GNULIB_WCSLEN])
 157   GNULIB_WCSNLEN=0;     AC_SUBST([GNULIB_WCSNLEN])
 158   GNULIB_WCSCPY=0;      AC_SUBST([GNULIB_WCSCPY])
 159   GNULIB_WCPCPY=0;      AC_SUBST([GNULIB_WCPCPY])
 160   GNULIB_WCSNCPY=0;     AC_SUBST([GNULIB_WCSNCPY])
 161   GNULIB_WCPNCPY=0;     AC_SUBST([GNULIB_WCPNCPY])
 162   GNULIB_WCSCAT=0;      AC_SUBST([GNULIB_WCSCAT])
 163   GNULIB_WCSNCAT=0;     AC_SUBST([GNULIB_WCSNCAT])
 164   GNULIB_WCSCMP=0;      AC_SUBST([GNULIB_WCSCMP])
 165   GNULIB_WCSNCMP=0;     AC_SUBST([GNULIB_WCSNCMP])
 166   GNULIB_WCSCASECMP=0;  AC_SUBST([GNULIB_WCSCASECMP])
 167   GNULIB_WCSNCASECMP=0; AC_SUBST([GNULIB_WCSNCASECMP])
 168   GNULIB_WCSCOLL=0;     AC_SUBST([GNULIB_WCSCOLL])
 169   GNULIB_WCSXFRM=0;     AC_SUBST([GNULIB_WCSXFRM])
 170   GNULIB_WCSDUP=0;      AC_SUBST([GNULIB_WCSDUP])
 171   GNULIB_WCSCHR=0;      AC_SUBST([GNULIB_WCSCHR])
 172   GNULIB_WCSRCHR=0;     AC_SUBST([GNULIB_WCSRCHR])
 173   GNULIB_WCSCSPN=0;     AC_SUBST([GNULIB_WCSCSPN])
 174   GNULIB_WCSSPN=0;      AC_SUBST([GNULIB_WCSSPN])
 175   GNULIB_WCSPBRK=0;     AC_SUBST([GNULIB_WCSPBRK])
 176   GNULIB_WCSSTR=0;      AC_SUBST([GNULIB_WCSSTR])
 177   GNULIB_WCSTOK=0;      AC_SUBST([GNULIB_WCSTOK])
 178   GNULIB_WCSWIDTH=0;    AC_SUBST([GNULIB_WCSWIDTH])
 179   dnl Assume proper GNU behavior unless another module says otherwise.
 180   HAVE_BTOWC=1;         AC_SUBST([HAVE_BTOWC])
 181   HAVE_MBSINIT=1;       AC_SUBST([HAVE_MBSINIT])
 182   HAVE_MBRTOWC=1;       AC_SUBST([HAVE_MBRTOWC])
 183   HAVE_MBRLEN=1;        AC_SUBST([HAVE_MBRLEN])
 184   HAVE_MBSRTOWCS=1;     AC_SUBST([HAVE_MBSRTOWCS])
 185   HAVE_MBSNRTOWCS=1;    AC_SUBST([HAVE_MBSNRTOWCS])
 186   HAVE_WCRTOMB=1;       AC_SUBST([HAVE_WCRTOMB])
 187   HAVE_WCSRTOMBS=1;     AC_SUBST([HAVE_WCSRTOMBS])
 188   HAVE_WCSNRTOMBS=1;    AC_SUBST([HAVE_WCSNRTOMBS])
 189   HAVE_WMEMCHR=1;       AC_SUBST([HAVE_WMEMCHR])
 190   HAVE_WMEMCMP=1;       AC_SUBST([HAVE_WMEMCMP])
 191   HAVE_WMEMCPY=1;       AC_SUBST([HAVE_WMEMCPY])
 192   HAVE_WMEMMOVE=1;      AC_SUBST([HAVE_WMEMMOVE])
 193   HAVE_WMEMSET=1;       AC_SUBST([HAVE_WMEMSET])
 194   HAVE_WCSLEN=1;        AC_SUBST([HAVE_WCSLEN])
 195   HAVE_WCSNLEN=1;       AC_SUBST([HAVE_WCSNLEN])
 196   HAVE_WCSCPY=1;        AC_SUBST([HAVE_WCSCPY])
 197   HAVE_WCPCPY=1;        AC_SUBST([HAVE_WCPCPY])
 198   HAVE_WCSNCPY=1;       AC_SUBST([HAVE_WCSNCPY])
 199   HAVE_WCPNCPY=1;       AC_SUBST([HAVE_WCPNCPY])
 200   HAVE_WCSCAT=1;        AC_SUBST([HAVE_WCSCAT])
 201   HAVE_WCSNCAT=1;       AC_SUBST([HAVE_WCSNCAT])
 202   HAVE_WCSCMP=1;        AC_SUBST([HAVE_WCSCMP])
 203   HAVE_WCSNCMP=1;       AC_SUBST([HAVE_WCSNCMP])
 204   HAVE_WCSCASECMP=1;    AC_SUBST([HAVE_WCSCASECMP])
 205   HAVE_WCSNCASECMP=1;   AC_SUBST([HAVE_WCSNCASECMP])
 206   HAVE_WCSCOLL=1;       AC_SUBST([HAVE_WCSCOLL])
 207   HAVE_WCSXFRM=1;       AC_SUBST([HAVE_WCSXFRM])
 208   HAVE_WCSDUP=1;        AC_SUBST([HAVE_WCSDUP])
 209   HAVE_WCSCHR=1;        AC_SUBST([HAVE_WCSCHR])
 210   HAVE_WCSRCHR=1;       AC_SUBST([HAVE_WCSRCHR])
 211   HAVE_WCSCSPN=1;       AC_SUBST([HAVE_WCSCSPN])
 212   HAVE_WCSSPN=1;        AC_SUBST([HAVE_WCSSPN])
 213   HAVE_WCSPBRK=1;       AC_SUBST([HAVE_WCSPBRK])
 214   HAVE_WCSSTR=1;        AC_SUBST([HAVE_WCSSTR])
 215   HAVE_WCSTOK=1;        AC_SUBST([HAVE_WCSTOK])
 216   HAVE_WCSWIDTH=1;      AC_SUBST([HAVE_WCSWIDTH])
 217   HAVE_DECL_WCTOB=1;    AC_SUBST([HAVE_DECL_WCTOB])
 218   HAVE_DECL_WCWIDTH=1;  AC_SUBST([HAVE_DECL_WCWIDTH])
 219   REPLACE_MBSTATE_T=0;  AC_SUBST([REPLACE_MBSTATE_T])
 220   REPLACE_BTOWC=0;      AC_SUBST([REPLACE_BTOWC])
 221   REPLACE_WCTOB=0;      AC_SUBST([REPLACE_WCTOB])
 222   REPLACE_MBSINIT=0;    AC_SUBST([REPLACE_MBSINIT])
 223   REPLACE_MBRTOWC=0;    AC_SUBST([REPLACE_MBRTOWC])
 224   REPLACE_MBRLEN=0;     AC_SUBST([REPLACE_MBRLEN])
 225   REPLACE_MBSRTOWCS=0;  AC_SUBST([REPLACE_MBSRTOWCS])
 226   REPLACE_MBSNRTOWCS=0; AC_SUBST([REPLACE_MBSNRTOWCS])
 227   REPLACE_WCRTOMB=0;    AC_SUBST([REPLACE_WCRTOMB])
 228   REPLACE_WCSRTOMBS=0;  AC_SUBST([REPLACE_WCSRTOMBS])
 229   REPLACE_WCSNRTOMBS=0; AC_SUBST([REPLACE_WCSNRTOMBS])
 230   REPLACE_WCWIDTH=0;    AC_SUBST([REPLACE_WCWIDTH])
 231   REPLACE_WCSWIDTH=0;   AC_SUBST([REPLACE_WCSWIDTH])
 232 ])