use __traits(externDmangle) if supported by compiler

rainers · rainers · commit 68f59edb2b96 · 2017-05-27T18:26:01.000+02:00
diff --git a/src/core/internal/traits.d b/src/core/internal/traits.d
@@ -88,7 +88,12 @@ private template substInoutForm(T)
 /// used to declare an extern(D) function that is defined in a different module
 template externDFunc(string fqn, T:FT*, FT) if(is(FT == function))
 {
-    static if (is(FT RT == return) && is(FT Args == function))
+    static if (__traits(compiles, __traits(foo, void function())))
+    {
+        alias _wrap(alias T) = T; // fool the parser
+        alias externDFunc = _wrap!(__traits(externDmangle, fqn, FT));
+    }
+    else static if (is(FT RT == return) && is(FT Args == function))
     {
         import core.demangle : mangleFunc;
         enum decl = {

Original file line number	Diff line number	Diff line change
`@@ -88,7 +88,12 @@ private template substInoutForm(T)`
`88`	`88`	`/// used to declare an extern(D) function that is defined in a different module`
`89`	`89`	`template externDFunc(string fqn, T:FT*, FT) if(is(FT == function))`
`90`	`90`	`{`
`91`		`- static if (is(FT RT == return) && is(FT Args == function))`
	`91`	`+ static if (__traits(compiles, __traits(foo, void function())))`
	`92`	`+ {`
	`93`	`+ alias _wrap(alias T) = T; // fool the parser`
	`94`	`+ alias externDFunc = _wrap!(__traits(externDmangle, fqn, FT));`
	`95`	`+ }`
	`96`	`+ else static if (is(FT RT == return) && is(FT Args == function))`
`92`	`97`	`{`
`93`	`98`	`import core.demangle : mangleFunc;`
`94`	`99`	`enum decl = {`