make getFileCharacteristic linetable aware. line markers that
play around with the 'is system header' bit now function correctly.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@63720 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Preprocessor/line-directive.c b/test/Preprocessor/line-directive.c
index 6946ad4..0a4b582 100644
--- a/test/Preprocessor/line-directive.c
+++ b/test/Preprocessor/line-directive.c
@@ -34,3 +34,23 @@
#error ABC // expected-error {{#error ABC}}
#error DEF // expected-error {{#error DEF}}
+
+// Verify that linemarker diddling of the system header flag works.
+
+# 192 "glomp.h" // not a system header.
+typedef int x; // expected-note {{previous definition is here}}
+typedef int x; // expected-error {{redefinition of 'x'}}
+
+# 192 "glomp.h" 3 // System header.
+typedef int y; // ok
+typedef int y; // ok
+
+#line 42 "blonk.h" // doesn't change system headerness.
+
+typedef int z; // ok
+typedef int z; // ok
+
+# 42 "blonk.h" // DOES change system headerness.
+
+typedef int w; // expected-note {{previous definition is here}}
+typedef int w; // expected-error {{redefinition of 'w'}}