| 1 | # wint_t.m4 serial 11
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| 2 | dnl Copyright (C) 2003, 2007-2021 Free Software Foundation, Inc.
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| 3 | dnl This file is free software; the Free Software Foundation
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| 4 | dnl gives unlimited permission to copy and/or distribute it,
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| 5 | dnl with or without modifications, as long as this notice is preserved.
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| 6 |
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| 7 | dnl From Bruno Haible.
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| 8 | dnl Test whether <wchar.h> has the 'wint_t' type and whether gnulib's
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| 9 | dnl <wchar.h> or <wctype.h> would, if present, override 'wint_t'.
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| 10 | dnl Prerequisite: AC_PROG_CC
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| 11 |
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| 12 | AC_DEFUN([gt_TYPE_WINT_T],
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| 13 | [
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| 14 | AC_CACHE_CHECK([for wint_t], [gt_cv_c_wint_t],
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| 15 | [AC_COMPILE_IFELSE(
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| 16 | [AC_LANG_PROGRAM(
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| 17 | [[#include <wchar.h>
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| 18 | wint_t foo = (wchar_t)'\0';]],
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| 19 | [[]])],
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| 20 | [gt_cv_c_wint_t=yes],
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| 21 | [gt_cv_c_wint_t=no])])
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| 22 | if test $gt_cv_c_wint_t = yes; then
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| 23 | AC_DEFINE([HAVE_WINT_T], [1], [Define if you have the 'wint_t' type.])
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| 24 |
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| 25 | dnl Determine whether gnulib's <wchar.h> or <wctype.h> would, if present,
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| 26 | dnl override 'wint_t'.
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| 27 | AC_CACHE_CHECK([whether wint_t is large enough],
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| 28 | [gl_cv_type_wint_t_large_enough],
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| 29 | [AC_COMPILE_IFELSE(
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| 30 | [AC_LANG_PROGRAM(
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| 31 | [[#include <wchar.h>
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| 32 | int verify[sizeof (wint_t) < sizeof (int) ? -1 : 1];
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| 33 | ]])],
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| 34 | [gl_cv_type_wint_t_large_enough=yes],
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| 35 | [gl_cv_type_wint_t_large_enough=no])])
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| 36 | if test $gl_cv_type_wint_t_large_enough = no; then
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| 37 | GNULIBHEADERS_OVERRIDE_WINT_T=1
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| 38 | else
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| 39 | GNULIBHEADERS_OVERRIDE_WINT_T=0
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| 40 | fi
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| 41 | else
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| 42 | GNULIBHEADERS_OVERRIDE_WINT_T=0
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| 43 | fi
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| 44 | AC_SUBST([GNULIBHEADERS_OVERRIDE_WINT_T])
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| 45 | ])
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| 46 |
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| 47 | dnl Prerequisites of the 'wint_t' override.
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| 48 | AC_DEFUN([gl_TYPE_WINT_T_PREREQ],
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| 49 | [
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| 50 | AC_CHECK_HEADERS_ONCE([crtdefs.h])
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| 51 | if test $ac_cv_header_crtdefs_h = yes; then
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| 52 | HAVE_CRTDEFS_H=1
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| 53 | else
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| 54 | HAVE_CRTDEFS_H=0
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| 55 | fi
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| 56 | AC_SUBST([HAVE_CRTDEFS_H])
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| 57 | ])
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