X-Git-Url: https://git.m6w6.name/?p=m6w6%2Fext-psi;a=blobdiff_plain;f=config.ax_check_sign.m4;fp=config.ax_check_sign.m4;h=244865f4ea4ea565860f1617ac8c41692f4bd676;hp=0000000000000000000000000000000000000000;hb=5d54598329a4d04dd0080bc1252d1de85a7befef;hpb=f18f62c084371e0da16305db4de27bfa124934c1

diff --git a/config.ax_check_sign.m4 b/config.ax_check_sign.m4
new file mode 100644
index 0000000..244865f
--- /dev/null
+++ b/config.ax_check_sign.m4
@@ -0,0 +1,14 @@
+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
+])