wint_t.m4 (1795B)
1 # wint_t.m4 serial 10 2 dnl Copyright (C) 2003, 2007-2021 Free Software Foundation, Inc. 3 dnl This file is free software; the Free Software Foundation 4 dnl gives unlimited permission to copy and/or distribute it, 5 dnl with or without modifications, as long as this notice is preserved. 6 7 dnl From Bruno Haible. 8 dnl Test whether <wchar.h> has the 'wint_t' type and whether gnulib's 9 dnl <wchar.h> or <wctype.h> would, if present, override 'wint_t'. 10 dnl Prerequisite: AC_PROG_CC 11 12 AC_DEFUN([gt_TYPE_WINT_T], 13 [ 14 AC_CACHE_CHECK([for wint_t], [gt_cv_c_wint_t], 15 [AC_COMPILE_IFELSE( 16 [AC_LANG_PROGRAM( 17 [[#include <wchar.h> 18 wint_t foo = (wchar_t)'\0';]], 19 [[]])], 20 [gt_cv_c_wint_t=yes], 21 [gt_cv_c_wint_t=no])]) 22 if test $gt_cv_c_wint_t = yes; then 23 AC_DEFINE([HAVE_WINT_T], [1], [Define if you have the 'wint_t' type.]) 24 25 dnl Determine whether gnulib's <wchar.h> or <wctype.h> would, if present, 26 dnl override 'wint_t'. 27 AC_CACHE_CHECK([whether wint_t is large enough], 28 [gl_cv_type_wint_t_large_enough], 29 [AC_COMPILE_IFELSE( 30 [AC_LANG_PROGRAM( 31 [[#include <wchar.h> 32 int verify[sizeof (wint_t) < sizeof (int) ? -1 : 1]; 33 ]])], 34 [gl_cv_type_wint_t_large_enough=yes], 35 [gl_cv_type_wint_t_large_enough=no])]) 36 if test $gl_cv_type_wint_t_large_enough = no; then 37 GNULIB_OVERRIDES_WINT_T=1 38 else 39 GNULIB_OVERRIDES_WINT_T=0 40 fi 41 else 42 GNULIB_OVERRIDES_WINT_T=0 43 fi 44 AC_SUBST([GNULIB_OVERRIDES_WINT_T]) 45 ]) 46 47 dnl Prerequisites of the 'wint_t' override. 48 AC_DEFUN([gl_TYPE_WINT_T_PREREQ], 49 [ 50 AC_CHECK_HEADERS_ONCE([crtdefs.h]) 51 if test $ac_cv_header_crtdefs_h = yes; then 52 HAVE_CRTDEFS_H=1 53 else 54 HAVE_CRTDEFS_H=0 55 fi 56 AC_SUBST([HAVE_CRTDEFS_H]) 57 ])