From: Bob Wilson <bob.wilson@apple.com>
Date: Wed, 7 Mar 2012 23:50:05 +0000 (+0000)
Subject: Workaround module test failures by removing the version info from module hashes.
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=e286d9b8b19b24da5158ffeb17a7de03644f1009;p=clang

Workaround module test failures by removing the version info from module hashes.

PR12196: The module hash strings are not actually hashing the compiler version
string; the entire version string is being included in the hash.  Depending on
the module cache directory name, that can lead to failures where the path
names become too long.  As a temporary workaround, just remove the version
string from the hash.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@152266 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Frontend/CompilerInvocation.cpp b/lib/Frontend/CompilerInvocation.cpp
index 7038e85c4a..9ccd9b2373 100644
--- a/lib/Frontend/CompilerInvocation.cpp
+++ b/lib/Frontend/CompilerInvocation.cpp
@@ -2196,7 +2196,10 @@ std::string CompilerInvocation::getModuleHash() const {
   ModuleSignature Signature;
   
   // Start the signature with the compiler version.
-  Signature.add(getClangFullRepositoryVersion());
+  // FIXME: The full version string can be quite long.  Omit it from the
+  // module hash for now to avoid failures where the path name becomes too
+  // long.  An MD5 or similar checksum would work well here.
+  // Signature.add(getClangFullRepositoryVersion());
   
   // Extend the signature with the language options
 #define LANGOPT(Name, Bits, Default, Description) \