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) 2007-2019 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 44
  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   AC_REQUIRE([gl_TYPE_WINT_T_PREREQ])
  39
  40   dnl Check for declarations of anything we want to poison if the
  41   dnl corresponding gnulib module is not in use.
  42   gl_WARN_ON_USE_PREPARE([[
  43 /* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
  44    <wchar.h>.
  45    BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be
  46    included before <wchar.h>.  */
  47 #if !(defined __GLIBC__ && !defined __UCLIBC__)
  48 # include <stddef.h>
  49 # include <stdio.h>
  50 # include <time.h>
  51 #endif
  52 #include <wchar.h>
  53     ]],
  54     [btowc wctob mbsinit mbrtowc mbrlen mbsrtowcs mbsnrtowcs wcrtomb
  55      wcsrtombs wcsnrtombs wcwidth wmemchr wmemcmp wmemcpy wmemmove wmemset
  56      wcslen wcsnlen wcscpy wcpcpy wcsncpy wcpncpy wcscat wcsncat wcscmp
  57      wcsncmp wcscasecmp wcsncasecmp wcscoll wcsxfrm wcsdup wcschr wcsrchr
  58      wcscspn wcsspn wcspbrk wcsstr wcstok wcswidth wcsftime
  59     ])
  60 ])
  61
  62 dnl Check whether <wchar.h> is usable at all.
  63 AC_DEFUN([gl_WCHAR_H_INLINE_OK],
  64 [
  65   dnl Test whether <wchar.h> suffers due to the transition from '__inline' to
  66   dnl 'gnu_inline'. See <https://sourceware.org/bugzilla/show_bug.cgi?id=4022>
  67   dnl and <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=42440>. In summary,
  68   dnl glibc version 2.5 or older, together with gcc version 4.3 or newer and
  69   dnl the option -std=c99 or -std=gnu99, leads to a broken <wchar.h>.
  70   AC_CACHE_CHECK([whether <wchar.h> uses 'inline' correctly],
  71     [gl_cv_header_wchar_h_correct_inline],
  72     [gl_cv_header_wchar_h_correct_inline=yes
  73      AC_LANG_CONFTEST([
  74        AC_LANG_SOURCE([[#define wcstod renamed_wcstod
  75 /* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
  76    <wchar.h>.
  77    BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be
  78    included before <wchar.h>.  */
  79 #include <stddef.h>
  80 #include <stdio.h>
  81 #include <time.h>
  82 #include <wchar.h>
  83 extern int zero (void);
  84 int main () { return zero(); }
  85 ]])])
  86      dnl Do not rename the object file from conftest.$ac_objext to
  87      dnl conftest1.$ac_objext, as this will cause the link to fail on
  88      dnl z/OS when using the XPLINK object format (due to duplicate
  89      dnl CSECT names). Instead, temporarily redefine $ac_compile so
  90      dnl that the object file has the latter name from the start.
  91      save_ac_compile="$ac_compile"
  92      ac_compile=`echo "$save_ac_compile" | sed s/conftest/conftest1/`
  93      if echo '#include "conftest.c"' >conftest1.c &&
  94         AC_TRY_EVAL([ac_compile]); then
  95        AC_LANG_CONFTEST([
  96          AC_LANG_SOURCE([[#define wcstod renamed_wcstod
  97 /* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
  98    <wchar.h>.
  99    BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be
 100    included before <wchar.h>.  */
 101 #include <stddef.h>
 102 #include <stdio.h>
 103 #include <time.h>
 104 #include <wchar.h>
 105 int zero (void) { return 0; }
 106 ]])])
 107        dnl See note above about renaming object files.
 108        ac_compile=`echo "$save_ac_compile" | sed s/conftest/conftest2/`
 109        if echo '#include "conftest.c"' >conftest2.c &&
 110           AC_TRY_EVAL([ac_compile]); then
 111          if $CC -o conftest$ac_exeext $CFLAGS $LDFLAGS conftest1.$ac_objext conftest2.$ac_objext $LIBS >&AS_MESSAGE_LOG_FD 2>&1; then
 112            :
 113          else
 114            gl_cv_header_wchar_h_correct_inline=no
 115          fi
 116        fi
 117      fi
 118      ac_compile="$save_ac_compile"
 119      rm -f conftest[12].c conftest[12].$ac_objext conftest$ac_exeext
 120     ])
 121   if test $gl_cv_header_wchar_h_correct_inline = no; then
 122     AC_MSG_ERROR([<wchar.h> cannot be used with this compiler ($CC $CFLAGS $CPPFLAGS).
 123 This is a known interoperability problem of glibc <= 2.5 with gcc >= 4.3 in
 124 C99 mode. You have four options:
 125   - Add the flag -fgnu89-inline to CC and reconfigure, or
 126   - Fix your include files, using parts of
 127     <https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=b037a293a48718af30d706c2e18c929d0e69a621>, or
 128   - Use a gcc version older than 4.3, or
 129   - Don't use the flags -std=c99 or -std=gnu99.
 130 Configuration aborted.])
 131   fi
 132 ])
 133
 134 AC_DEFUN([gl_WCHAR_MODULE_INDICATOR],
 135 [
 136   dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
 137   AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
 138   gl_MODULE_INDICATOR_SET_VARIABLE([$1])
 139   dnl Define it also as a C macro, for the benefit of the unit tests.
 140   gl_MODULE_INDICATOR_FOR_TESTS([$1])
 141 ])
 142
 143 AC_DEFUN([gl_WCHAR_H_DEFAULTS],
 144 [
 145   GNULIB_BTOWC=0;       AC_SUBST([GNULIB_BTOWC])
 146   GNULIB_WCTOB=0;       AC_SUBST([GNULIB_WCTOB])
 147   GNULIB_MBSINIT=0;     AC_SUBST([GNULIB_MBSINIT])
 148   GNULIB_MBRTOWC=0;     AC_SUBST([GNULIB_MBRTOWC])
 149   GNULIB_MBRLEN=0;      AC_SUBST([GNULIB_MBRLEN])
 150   GNULIB_MBSRTOWCS=0;   AC_SUBST([GNULIB_MBSRTOWCS])
 151   GNULIB_MBSNRTOWCS=0;  AC_SUBST([GNULIB_MBSNRTOWCS])
 152   GNULIB_WCRTOMB=0;     AC_SUBST([GNULIB_WCRTOMB])
 153   GNULIB_WCSRTOMBS=0;   AC_SUBST([GNULIB_WCSRTOMBS])
 154   GNULIB_WCSNRTOMBS=0;  AC_SUBST([GNULIB_WCSNRTOMBS])
 155   GNULIB_WCWIDTH=0;     AC_SUBST([GNULIB_WCWIDTH])
 156   GNULIB_WMEMCHR=0;     AC_SUBST([GNULIB_WMEMCHR])
 157   GNULIB_WMEMCMP=0;     AC_SUBST([GNULIB_WMEMCMP])
 158   GNULIB_WMEMCPY=0;     AC_SUBST([GNULIB_WMEMCPY])
 159   GNULIB_WMEMMOVE=0;    AC_SUBST([GNULIB_WMEMMOVE])
 160   GNULIB_WMEMSET=0;     AC_SUBST([GNULIB_WMEMSET])
 161   GNULIB_WCSLEN=0;      AC_SUBST([GNULIB_WCSLEN])
 162   GNULIB_WCSNLEN=0;     AC_SUBST([GNULIB_WCSNLEN])
 163   GNULIB_WCSCPY=0;      AC_SUBST([GNULIB_WCSCPY])
 164   GNULIB_WCPCPY=0;      AC_SUBST([GNULIB_WCPCPY])
 165   GNULIB_WCSNCPY=0;     AC_SUBST([GNULIB_WCSNCPY])
 166   GNULIB_WCPNCPY=0;     AC_SUBST([GNULIB_WCPNCPY])
 167   GNULIB_WCSCAT=0;      AC_SUBST([GNULIB_WCSCAT])
 168   GNULIB_WCSNCAT=0;     AC_SUBST([GNULIB_WCSNCAT])
 169   GNULIB_WCSCMP=0;      AC_SUBST([GNULIB_WCSCMP])
 170   GNULIB_WCSNCMP=0;     AC_SUBST([GNULIB_WCSNCMP])
 171   GNULIB_WCSCASECMP=0;  AC_SUBST([GNULIB_WCSCASECMP])
 172   GNULIB_WCSNCASECMP=0; AC_SUBST([GNULIB_WCSNCASECMP])
 173   GNULIB_WCSCOLL=0;     AC_SUBST([GNULIB_WCSCOLL])
 174   GNULIB_WCSXFRM=0;     AC_SUBST([GNULIB_WCSXFRM])
 175   GNULIB_WCSDUP=0;      AC_SUBST([GNULIB_WCSDUP])
 176   GNULIB_WCSCHR=0;      AC_SUBST([GNULIB_WCSCHR])
 177   GNULIB_WCSRCHR=0;     AC_SUBST([GNULIB_WCSRCHR])
 178   GNULIB_WCSCSPN=0;     AC_SUBST([GNULIB_WCSCSPN])
 179   GNULIB_WCSSPN=0;      AC_SUBST([GNULIB_WCSSPN])
 180   GNULIB_WCSPBRK=0;     AC_SUBST([GNULIB_WCSPBRK])
 181   GNULIB_WCSSTR=0;      AC_SUBST([GNULIB_WCSSTR])
 182   GNULIB_WCSTOK=0;      AC_SUBST([GNULIB_WCSTOK])
 183   GNULIB_WCSWIDTH=0;    AC_SUBST([GNULIB_WCSWIDTH])
 184   GNULIB_WCSFTIME=0;    AC_SUBST([GNULIB_WCSFTIME])
 185   dnl Assume proper GNU behavior unless another module says otherwise.
 186   HAVE_BTOWC=1;         AC_SUBST([HAVE_BTOWC])
 187   HAVE_MBSINIT=1;       AC_SUBST([HAVE_MBSINIT])
 188   HAVE_MBRTOWC=1;       AC_SUBST([HAVE_MBRTOWC])
 189   HAVE_MBRLEN=1;        AC_SUBST([HAVE_MBRLEN])
 190   HAVE_MBSRTOWCS=1;     AC_SUBST([HAVE_MBSRTOWCS])
 191   HAVE_MBSNRTOWCS=1;    AC_SUBST([HAVE_MBSNRTOWCS])
 192   HAVE_WCRTOMB=1;       AC_SUBST([HAVE_WCRTOMB])
 193   HAVE_WCSRTOMBS=1;     AC_SUBST([HAVE_WCSRTOMBS])
 194   HAVE_WCSNRTOMBS=1;    AC_SUBST([HAVE_WCSNRTOMBS])
 195   HAVE_WMEMCHR=1;       AC_SUBST([HAVE_WMEMCHR])
 196   HAVE_WMEMCMP=1;       AC_SUBST([HAVE_WMEMCMP])
 197   HAVE_WMEMCPY=1;       AC_SUBST([HAVE_WMEMCPY])
 198   HAVE_WMEMMOVE=1;      AC_SUBST([HAVE_WMEMMOVE])
 199   HAVE_WMEMSET=1;       AC_SUBST([HAVE_WMEMSET])
 200   HAVE_WCSLEN=1;        AC_SUBST([HAVE_WCSLEN])
 201   HAVE_WCSNLEN=1;       AC_SUBST([HAVE_WCSNLEN])
 202   HAVE_WCSCPY=1;        AC_SUBST([HAVE_WCSCPY])
 203   HAVE_WCPCPY=1;        AC_SUBST([HAVE_WCPCPY])
 204   HAVE_WCSNCPY=1;       AC_SUBST([HAVE_WCSNCPY])
 205   HAVE_WCPNCPY=1;       AC_SUBST([HAVE_WCPNCPY])
 206   HAVE_WCSCAT=1;        AC_SUBST([HAVE_WCSCAT])
 207   HAVE_WCSNCAT=1;       AC_SUBST([HAVE_WCSNCAT])
 208   HAVE_WCSCMP=1;        AC_SUBST([HAVE_WCSCMP])
 209   HAVE_WCSNCMP=1;       AC_SUBST([HAVE_WCSNCMP])
 210   HAVE_WCSCASECMP=1;    AC_SUBST([HAVE_WCSCASECMP])
 211   HAVE_WCSNCASECMP=1;   AC_SUBST([HAVE_WCSNCASECMP])
 212   HAVE_WCSCOLL=1;       AC_SUBST([HAVE_WCSCOLL])
 213   HAVE_WCSXFRM=1;       AC_SUBST([HAVE_WCSXFRM])
 214   HAVE_WCSDUP=1;        AC_SUBST([HAVE_WCSDUP])
 215   HAVE_WCSCHR=1;        AC_SUBST([HAVE_WCSCHR])
 216   HAVE_WCSRCHR=1;       AC_SUBST([HAVE_WCSRCHR])
 217   HAVE_WCSCSPN=1;       AC_SUBST([HAVE_WCSCSPN])
 218   HAVE_WCSSPN=1;        AC_SUBST([HAVE_WCSSPN])
 219   HAVE_WCSPBRK=1;       AC_SUBST([HAVE_WCSPBRK])
 220   HAVE_WCSSTR=1;        AC_SUBST([HAVE_WCSSTR])
 221   HAVE_WCSTOK=1;        AC_SUBST([HAVE_WCSTOK])
 222   HAVE_WCSWIDTH=1;      AC_SUBST([HAVE_WCSWIDTH])
 223   HAVE_WCSFTIME=1;      AC_SUBST([HAVE_WCSFTIME])
 224   HAVE_DECL_WCTOB=1;    AC_SUBST([HAVE_DECL_WCTOB])
 225   HAVE_DECL_WCWIDTH=1;  AC_SUBST([HAVE_DECL_WCWIDTH])
 226   REPLACE_MBSTATE_T=0;  AC_SUBST([REPLACE_MBSTATE_T])
 227   REPLACE_BTOWC=0;      AC_SUBST([REPLACE_BTOWC])
 228   REPLACE_WCTOB=0;      AC_SUBST([REPLACE_WCTOB])
 229   REPLACE_MBSINIT=0;    AC_SUBST([REPLACE_MBSINIT])
 230   REPLACE_MBRTOWC=0;    AC_SUBST([REPLACE_MBRTOWC])
 231   REPLACE_MBRLEN=0;     AC_SUBST([REPLACE_MBRLEN])
 232   REPLACE_MBSRTOWCS=0;  AC_SUBST([REPLACE_MBSRTOWCS])
 233   REPLACE_MBSNRTOWCS=0; AC_SUBST([REPLACE_MBSNRTOWCS])
 234   REPLACE_WCRTOMB=0;    AC_SUBST([REPLACE_WCRTOMB])
 235   REPLACE_WCSRTOMBS=0;  AC_SUBST([REPLACE_WCSRTOMBS])
 236   REPLACE_WCSNRTOMBS=0; AC_SUBST([REPLACE_WCSNRTOMBS])
 237   REPLACE_WCWIDTH=0;    AC_SUBST([REPLACE_WCWIDTH])
 238   REPLACE_WCSWIDTH=0;   AC_SUBST([REPLACE_WCSWIDTH])
 239   REPLACE_WCSFTIME=0;   AC_SUBST([REPLACE_WCSFTIME])
 240   REPLACE_WCSTOK=0;     AC_SUBST([REPLACE_WCSTOK])
 241 ])