Fixed the bug that redefined macros could co-exist but not all be undefined with a single #undef.

2022-08-06 18:21:42 +08:00
parent b93f9fbba4
commit ae811baaf1
2 changed files with 155 additions and 126 deletions
--- a/test/val/bug1822-pptest.c
+++ b/test/val/bug1822-pptest.c
@@ -0,0 +1,25 @@
+/* Bug #1822 - Redefined macros failed to be all undefined with a single #undef */
+
+#undef F
+#undef F
+
+#define F 1
+#define F 1
+
+#undef F
+#if defined F
+#error #undef F fails!
+#endif
+
+#define F 0
+
+#include <stdio.h>
+
+int main(void)
+{
+    if (F != 0)
+    {
+        printf("failed: F = %d\n", F);
+    }
+    return F;
+}