Extended VerifyDiagnosticConsumer to also verify source file for diagnostic.

VerifyDiagnosticConsumer previously would not check that the diagnostic and
its matching directive referenced the same source file.  Common practice was
to create directives that referenced other files but only by line number,
and this led to problems such as when the file containing the directive
didn't have enough lines to match the location of the diagnostic in the
other file, leading to bizarre file formatting and other oddities.

This patch causes VerifyDiagnosticConsumer to match source files as well as
line numbers.  Therefore, a new syntax is made available for directives, for
example:

// expected-error@file:line {{diagnostic message}}

This extends the @line feature where "file" is the file where the diagnostic
is generated.  The @line syntax is still available and uses the current file
for the diagnostic.  "file" can be specified either as a relative or absolute
path - although the latter has less usefulness, I think!  The #include search
paths will be used to locate the file and if it is not found an error will be
generated.

The new check is not optional: if the directive is in a different file to the
diagnostic, the file must be specified.  Therefore, a number of test-cases
have been updated with regard to this.

This closes out PR15613.

llvm-svn: 179677

1 files changed, 11 insertions, 12 deletions

diff --git a/clang/test/Modules/linkage-merge.m b/clang/test/Modules/linkage-merge.m
index 16e22050783..e838ca10183 100644
--- a/clang/test/Modules/linkage-merge.m
+++ b/clang/test/Modules/linkage-merge.m
@@ -1,27 +1,26 @@
-// In module: expected-note{{previous declaration}}
-
-
-
-
-// In module: expected-note{{previous definition is here}}
+// RUN: rm -rf %t
+// RUN: %clang_cc1 -fmodules -x objective-c -fmodules-cache-path=%t -emit-module -fmodule-name=linkage_merge_left %S/Inputs/module.map
+// RUN: %clang_cc1 -fmodules -fmodules-cache-path=%t -w %s -verify
 
 // Test redeclarations of functions where the original declaration is
 // still hidden.
 
 @import linkage_merge_left; // excludes "sub"
 
-extern int f0(float); // expected-error{{conflicting types for 'f0'}}
+extern int f0(float);
+// expected-error@-1{{conflicting types for 'f0'}}
+// expected-note@Inputs/linkage-merge-sub.h:1{{previous declaration}}
+
 static int f1(float); // okay: considered distinct
 static int f2(float); // okay: considered distinct
 extern int f3(float); // okay: considered distinct
 
-extern float v0; // expected-error{{redefinition of 'v0' with a different type: 'float' vs 'int'}}
+extern float v0;
+// expected-error@-1{{redefinition of 'v0' with a different type: 'float' vs 'int'}}
+// expected-note@Inputs/linkage-merge-sub.h:6{{previous definition is here}}
+
 static float v1;
 static float v2;
 extern float v3;
 
 typedef float T0;
-
-// RUN: rm -rf %t
-// RUN: %clang_cc1 -fmodules -x objective-c -fmodules-cache-path=%t -emit-module -fmodule-name=linkage_merge_left %S/Inputs/module.map
-// RUN: %clang_cc1 -fmodules -fmodules-cache-path=%t -w %s -verify