fix Issue 11239 - [REG2.064beta] ctRegex causes link errors with -debug since Pull2550

src/glue.c

@@ -603,6 +603,12 @@ void FuncDeclaration::toObjFile(int multiobj)
     TemplateInstance *ti = inTemplateInstance();
     if (!global.params.useUnitTests &&
         !global.params.allInst &&
+        /* The issue is that if the importee is compiled with a different -debug
+         * setting than the importer, the importer may believe it exists
+         * in the compiled importee when it does not, when the instantiation
+         * is behind a conditional debug declaration.
+         */
+        !global.params.debuglevel &&     // workaround for Bugzilla 11239
         ti && ti->instantiatingModule && !ti->instantiatingModule->isRoot())
     {
         Module *mi = ti->instantiatingModule;

test/runnable/imports/inc11239.d

@@ -0,0 +1,11 @@
+// REQUIRED_ARGS:
+
+int foo(T)(T x)
+{
+    return 3;
+}
+
+debug
+{
+    int x = foo(2);
+}

test/runnable/test11239.d

@@ -0,0 +1,11 @@
+// EXTRA_SOURCES: imports/inc11239.d
+// REQUIRED_ARGS: -debug
+// COMPILE_SEPARATELY
+// PERMUTE_ARGS:
+
+import imports.inc11239;
+
+void main()
+{
+    foo(1);
+}