Add test coverage for recent behavior change in GNU line marker pre-processing

llvm-svn: 303642

clang/test/Frontend/Inputs/line-directive.h

@@ -0,0 +1,2 @@
+#line 10 "foo.h"
+foo(); // will warn if not treated as a system header

clang/test/Frontend/system-header-line-directive.c

@@ -1,20 +1,23 @@
-// RUN: %clang_cc1 -Wall %s -isystem %S/Inputs/SystemHeaderPrefix -verify
-// RUN: %clang_cc1 %s -E -o - -isystem %S/Inputs/SystemHeaderPrefix | FileCheck %s
+// RUN: %clang_cc1 -Wall %s -I %S/Inputs -isystem %S/Inputs/SystemHeaderPrefix -verify
+// RUN: %clang_cc1 %s -E -o - -I %S/Inputs -isystem %S/Inputs/SystemHeaderPrefix | FileCheck %s
 #include <noline.h>
-#include <line.h>
+#include <line-directive-in-system.h>
+
+// expected-warning@line-directive.h:* {{type specifier missing, defaults to 'int'}}
+#include "line-directive.h"
 
 // This tests that "#line" directives in system headers preserve system
 // header-ness just like GNU line markers that don't have filenames.  This was
 // PR30752.
 
-// expected-no-diagnostics
-
 // CHECK: # {{[0-9]+}} "{{.*}}system-header-line-directive.c" 2
 // CHECK: # 1 "{{.*}}noline.h" 1 3
 // CHECK: foo();
 // CHECK: # 4 "{{.*}}system-header-line-directive.c" 2
-// CHECK: # 1 "{{.*}}line.h" 1 3
+// CHECK: # 1 "{{.*}}line-directive-in-system.h" 1 3
 //      The "3" below indicates that "foo.h" is considered a system header.
 // CHECK: # 1 "foo.h" 3
 // CHECK: foo();
 // CHECK: # {{[0-9]+}} "{{.*}}system-header-line-directive.c" 2
+// CHECK: # 1 "{{.*}}line-directive.h" 1
+// CHECK: # 10 "foo.h"{{$}}

clang/test/Preprocessor/line-directive-output.c

@@ -76,3 +76,10 @@ extern int z;
 
 // CHECK: # 50 "a\n.c"
 # 50 "a\012.c"
+
+# 1 "system.h" 3
+# 2
+void sys_foo(void);
+// CHECK: # 1 "system.h" 3
+// CHECK-NEXT: # 2 "system.h" 3
+// CHECK-NEXT: void sys_foo(void);