3 files changed, 85 insertions, 2 deletions
diff --git a/src/glsl/glcpp/glcpp-lex.l b/src/glsl/glcpp/glcpp-lex.l
index a81c8f92c14..6773832f29d 100644
--- a/src/glsl/glcpp/glcpp-lex.l
+++ b/src/glsl/glcpp/glcpp-lex.l
@@ -90,16 +90,18 @@ HEXADECIMAL_INTEGER	0[xX][0-9a-fA-F]+[uU]?
 }
 
 {HASH}ifdef/.*\n {
+	yyextra->lexing_if = 1;
 	yyextra->space_tokens = 0;
 	return HASH_IFDEF;
 }
 
 {HASH}ifndef/.*\n {
+	yyextra->lexing_if = 1;
 	yyextra->space_tokens = 0;
 	return HASH_IFNDEF;
 }
 
-{HASH}if{HSPACE}*/[^_a-zA-Z0-9].*\n {
+{HASH}if/[^_a-zA-Z0-9].*\n {
 	yyextra->lexing_if = 1;
 	yyextra->space_tokens = 0;
 	return HASH_IF;
@@ -122,7 +124,7 @@ HEXADECIMAL_INTEGER	0[xX][0-9a-fA-F]+[uU]?
 }
 
 	/* When skipping (due to an #if 0 or similar) consume anything
-	 * up to a newline. We do this less priroty than any
+	 * up to a newline. We do this with less priority than any
 	 * #if-related directive (#if, #elif, #else, #endif), but with
 	 * more priority than any other directive or token to avoid
 	 * any side-effects from skipped content.
diff --git a/src/glsl/glcpp/tests/067-nested-ifdef-ifndef.c b/src/glsl/glcpp/tests/067-nested-ifdef-ifndef.c
new file mode 100644
index 00000000000..f46cce4e60a
--- /dev/null
+++ b/src/glsl/glcpp/tests/067-nested-ifdef-ifndef.c
@@ -0,0 +1,40 @@
+#define D1
+#define D2
+
+#define result success
+
+#ifdef U1
+#ifdef U2
+#undef result
+#define result failure
+#endif
+#endif
+result
+
+#ifndef D1
+#ifndef D2
+#undef result
+#define result failure
+#endif
+#endif
+result
+
+#undef result
+#define result failure
+#ifdef D1
+#ifdef D2
+#undef result
+#define result success
+#endif
+#endif
+result
+
+#undef result
+#define result failure
+#ifndef U1
+#ifndef U2
+#undef result
+#define result success
+#endif
+#endif
+result
diff --git a/src/glsl/glcpp/tests/067-nested-ifdef-ifndef.c.expected b/src/glsl/glcpp/tests/067-nested-ifdef-ifndef.c.expected
new file mode 100644
index 00000000000..3340daaa1f9
--- /dev/null
+++ b/src/glsl/glcpp/tests/067-nested-ifdef-ifndef.c.expected
@@ -0,0 +1,41 @@
+
+
+
+
+
+
+
+
+
+
+
+success
+
+
+
+
+
+
+
+success
+
+
+
+
+
+
+
+
+
+success
+
+
+
+
+
+
+
+
+
+success
+