rework config.m4

[m6w6/ext-psi] / config.ax_check_sign.m4

diff --git a/config.ax_check_sign.m4 b/config.ax_check_sign.m4
new file mode 100644 (file)
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
+])