commit 7c1383ec502ea467fc47d59b0150f9db4f060da6
author Bruno Cardoso Lopes <bruno.cardoso@gmail.com> Tue Feb 07 13:54:29 2017 -0800
committer Bruno Cardoso Lopes <bruno.cardoso@gmail.com> Tue Feb 07 13:54:29 2017 -0800
tree d447e233422583ef765924a4fc31c2c55d44f8e5
parent e8941c161d64948e879a4d728dd2f5ffb1f02076

[Modules] Improve ReadASTBlock error message when module not available

Point to the PCM file that could not be found.

rdar://problem/30381981

lib/Serialization/ASTReader.cpp

diff --git a/lib/Serialization/ASTReader.cpp b/lib/Serialization/ASTReader.cpp
index c5edca7..9d50f7a 100644
--- a/lib/Serialization/ASTReader.cpp
+++ b/lib/Serialization/ASTReader.cpp
@@ -2976,7 +2976,10 @@
         Data += Len;
         ModuleFile *OM = ModuleMgr.lookup(Name);
         if (!OM) {
-          Error("SourceLocation remap refers to unknown module");
+          std::string Msg =
+              "SourceLocation remap refers to unknown module, cannot find ";
+          Msg.append(Name);
+          Error(Msg);
           return Failure;
         }