Add a testcase for https://github.com/cc65/cc65/pull/757

test/misc/Makefile

@@ -72,6 +72,11 @@ $(WORKDIR)/limits.$1.$2.prg: limits.c $(DIFF)
 	$(SIM65) $(SIM65FLAGS) $$@ > $(WORKDIR)/limits.$1.out
 	$(DIFF) $(WORKDIR)/limits.$1.out limits.ref
 
+$(WORKDIR)/goto.$1.$2.prg: goto.c $(DIFF)
+	$(if $(QUIET),echo misc/goto.$1.$2.prg)
+	$(CL65) -t sim$2 -$1 -o $$@ $$< 2>$(WORKDIR)/goto.$1.out
+	$(DIFF) $(WORKDIR)/goto.$1.out goto.ref
+
 # the rest are tests that fail currently for one reason or another
 $(WORKDIR)/fields.$1.$2.prg: fields.c | $(WORKDIR)
 	@echo "FIXME: " $$@ "currently will fail."

test/misc/goto.c

@@ -0,0 +1,65 @@
+#include <stdio.h>
+#define false 0
+#define true (!false)
+
+int main () {
+    int var  = 3;
+    int quit = false;
+
+    goto finish;
+
+    while (!quit) {
+        var += 1;
+        {
+            if (var % 2) {
+                int var2 = 2;
+                int var3 = 4;
+                goto safe;
+                goto unsafe;
+                {
+                another:
+                    var2 = 0x5599;
+                safe:
+                    printf ("var2: %d\n", var2);
+                }
+            } else {
+                int var3 = 3;
+                int x    = 4;
+                goto unsafe;
+                goto bad;
+            unused:
+                printf ("var3: %d\n", var3);
+                {
+                    int var = 1;
+                bad:
+                    var++;
+                    if (var < 4)
+                        goto bad;
+                    goto finish;
+                }
+            unsafe:
+                var3 = 4;
+                goto another;
+            }
+
+            {
+                int var = 2;
+                goto bad;
+            }
+
+
+            var += 1;
+            if (var >= 10)
+                goto finish;
+        }
+    }
+finish:
+    return var;
+}
+
+int function () {
+    goto end;
+
+end:
+    ;
+}

test/misc/goto.ref

@@ -0,0 +1,7 @@
+goto.c(34): Warning: Goto from line 29 to label 'bad' can result in a trashed stack
+goto.c(40): Warning: Goto from line 18 to label 'unsafe' can result in a trashed stack
+goto.c(42): Warning: Goto from line 42 to label 'another' can result in a trashed stack
+goto.c(47): Warning: Goto from line 47 to label 'bad' can result in a trashed stack
+goto.c(56): Warning: Goto from line 38 to label 'finish' can result in a trashed stack
+goto.c(58): Warning: `unused' is defined but never used
+goto.c(65): Warning: Control reaches end of non-void function