# =========================================================================== # http://www.gnu.org/software/autoconf-archive/ax_check_sign.html # =========================================================================== # # SYNOPSIS # # AX_CHECK_SIGN (TYPE, [ACTION-IF-SIGNED], [ACTION-IF-UNSIGNED], [INCLUDES]) # # DESCRIPTION # # Checks whether TYPE is signed or not. If no INCLUDES are specified, the # default includes are used. If ACTION-IF-SIGNED is given, it is # additional shell code to execute when the type is signed. If # ACTION-IF-UNSIGNED is given, it is executed when the type is unsigned. # # This macro assumes that the type exists. Therefore the existence of the # type should be checked before calling this macro. For example: # # AC_CHECK_HEADERS([wchar.h]) # AC_CHECK_TYPE([wchar_t],,[ AC_MSG_ERROR([Type wchar_t not found.]) ]) # AX_CHECK_SIGN([wchar_t], # [ AC_DEFINE(WCHAR_T_SIGNED, 1, [Define if wchar_t is signed]) ], # [ AC_DEFINE(WCHAR_T_UNSIGNED, 1, [Define if wchar_t is unsigned]) ], [ # #ifdef HAVE_WCHAR_H # #include <wchar.h> # #endif # ]) # # 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. This file is offered as-is, without any # warranty. #serial 6 AU_ALIAS([VL_CHECK_SIGN], [AX_CHECK_SIGN]) AC_DEFUN([AX_CHECK_SIGN], [ typename=`echo $1 | sed "s/@<:@^a-zA-Z0-9_@:>@/_/g"` AC_CACHE_CHECK([whether $1 is signed], ax_cv_decl_${typename}_signed, [ AC_TRY_COMPILE([$4], [ int foo @<:@ 1 - 2 * !((($1) -1) < 0) @:>@ ], [ eval "ax_cv_decl_${typename}_signed=\"yes\"" ], [ eval "ax_cv_decl_${typename}_signed=\"no\"" ])]) symbolname=`echo $1 | sed "s/@<:@^a-zA-Z0-9_@:>@/_/g" | tr "a-z" "A-Z"` if eval "test \"\${ax_cv_decl_${typename}_signed}\" = \"yes\""; then $2 elif eval "test \"\${ax_cv_decl_${typename}_signed}\" = \"no\""; then $3 fi ])dnl