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| author | Reuben Thomas <rrt@sc3d.org> | 2009-08-06 13:40:02 +0100 |
|---|---|---|
| committer | Reuben Thomas <rrt@sc3d.org> | 2009-08-06 13:40:02 +0100 |
| commit | 67e8fe88d9a9a1bc930a906bc12310ed3bae9a86 (patch) | |
| tree | 89393abb338535957334cb73c2a542919a35e3a9 /m4/ax_decl_wchar_max.m4 | |
| parent | 190f63935ec25ddce7ee9a580f55b27d83efac15 (diff) | |
| download | autoconf-archive-67e8fe88d9a9a1bc930a906bc12310ed3bae9a86.tar.gz | |
Rename VL_* macros to AX_* macros.
Diffstat (limited to 'm4/ax_decl_wchar_max.m4')
| -rw-r--r-- | m4/ax_decl_wchar_max.m4 | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/m4/ax_decl_wchar_max.m4 b/m4/ax_decl_wchar_max.m4 new file mode 100644 index 0000000..9aad3c8 --- /dev/null +++ b/m4/ax_decl_wchar_max.m4 @@ -0,0 +1,48 @@ +# =========================================================================== +# http://www.nongnu.org/autoconf-archive/vl_decl_wchar_max.html +# =========================================================================== +# +# SYNOPSIS +# +# AX_DECL_WCHAR_MAX +# +# DESCRIPTION +# +# Checks whether the system headers define WCHAR_MAX or not. If it is +# already defined, does nothing. Otherwise checks the size and signedness +# of `wchar_t', and defines WCHAR_MAX to the maximum value that can be +# stored in a variable of type `wchar_t'. +# +# LICENSE +# +# Copyright (c) 2008 Ville Laurikari <vl@iki.fi> +# +# Copying and distribution of this file, with or without modification, are +# permitted in any medium without royalty provided the copyright notice +# and this notice are preserved. + +AC_DEFUN([AX_DECL_WCHAR_MAX], [ + AC_CACHE_CHECK([whether WCHAR_MAX is defined], vl_cv_decl_wchar_max, [ + AC_TRY_COMPILE([ +#ifdef HAVE_WCHAR_H +#include <wchar.h> +#endif +],[WCHAR_MAX],[vl_cv_decl_wchar_max="yes"],[vl_cv_decl_wchar_max="no"])]) + if test $vl_cv_decl_wchar_max = "no"; then + AX_CHECK_SIGN([wchar_t], + [ wc_signed="yes" + AC_DEFINE(WCHAR_T_SIGNED, 1, [Define if wchar_t is signed]) ], + [ wc_signed="no" + AC_DEFINE(WCHAR_T_UNSIGNED, 1, [Define if wchar_t is unsigned])], [ +#ifdef HAVE_WCHAR_H +#include <wchar.h> +#endif +]) + if test "$wc_signed" = "yes"; then + AC_DEFINE(WCHAR_MAX, [(1L << (sizeof(wchar_t) * 8 - 1) - 1)], [ +Define to the maximum value of wchar_t if not already defined elsewhere]) + elif test "$wc_signed" = "no"; then + AC_DEFINE(WCHAR_MAX, [(1L << (sizeof(wchar_t) * 8) - 1)]) + fi + fi +])dnl |