From a2a9d6e4e5b6001b86b7dfc5db1ea296ce29a3d3 Mon Sep 17 00:00:00 2001
From: Ted Kremenek <kremenek@apple.com>
Date: Fri, 12 Feb 2010 22:54:40 +0000
Subject: [PATCH] Make the following functions thread-safe but having them
 return an std::string that is reconstructed every time they are called:

getClangRevision()
getClangFullRepositoryVersion()
getClangFullVersion()

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@96033 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/clang-c/Index.h       |  2 +-
 include/clang/Basic/Version.h |  6 ++---
 lib/Basic/Version.cpp         | 47 +++++++++++++++--------------------
 tools/CIndex/CIndex.cpp       |  4 +--
 4 files changed, 26 insertions(+), 33 deletions(-)

diff --git a/include/clang-c/Index.h b/include/clang-c/Index.h
index 90894e303e..a42ec0669e 100644
--- a/include/clang-c/Index.h
+++ b/include/clang-c/Index.h
@@ -1638,7 +1638,7 @@ void clang_disposeCodeCompleteResults(CXCodeCompleteResults *Results);
  * \brief Return a version string, suitable for showing to a user, but not
  *        intended to be parsed (the format is not guaranteed to be stable).
  */
-CINDEX_LINKAGE const char *clang_getClangVersion();
+CINDEX_LINKAGE CXString clang_getClangVersion();
 
 /**
  * \brief Return a version string, suitable for showing to a user, but not
diff --git a/include/clang/Basic/Version.h b/include/clang/Basic/Version.h
index 4710b6b608..2728637ba4 100644
--- a/include/clang/Basic/Version.h
+++ b/include/clang/Basic/Version.h
@@ -56,16 +56,16 @@ namespace clang {
   
   /// \brief Retrieves the repository revision number (or identifer) from which
   ///  this Clang was built.
-  llvm::StringRef getClangRevision();
+  std::string getClangRevision();
   
   /// \brief Retrieves the full repository version that is an amalgamation of
   ///  the information in getClangRepositoryPath() and getClangRevision().
-  llvm::StringRef getClangFullRepositoryVersion();
+  std::string getClangFullRepositoryVersion();
   
   /// \brief Retrieves a string representing the complete clang version,
   ///   which includes the clang version number, the repository version, 
   ///   and the vendor tag.
-  const char *getClangFullVersion();
+  std::string getClangFullVersion();
 }
 
 #endif // LLVM_CLANG_BASIC_VERSION_H
diff --git a/lib/Basic/Version.cpp b/lib/Basic/Version.cpp
index f9d62f9dc7..0c81fdd075 100644
--- a/lib/Basic/Version.cpp
+++ b/lib/Basic/Version.cpp
@@ -39,44 +39,37 @@ llvm::StringRef getClangRepositoryPath() {
   return llvm::StringRef(URL, URLEnd - URL);
 }
 
-
-llvm::StringRef getClangRevision() {
+std::string getClangRevision() {
 #ifndef SVN_REVISION
   // Subversion was not available at build time?
-  return llvm::StringRef();
+  return "";
 #else
-  static std::string revision;
-  if (revision.empty()) {
-    llvm::raw_string_ostream OS(revision);
-    OS << strtol(SVN_REVISION, 0, 10);
-  }
+  std::string revision;
+  llvm::raw_string_ostream OS(revision);
+  OS << strtol(SVN_REVISION, 0, 10);
   return revision;
 #endif
 }
 
-llvm::StringRef getClangFullRepositoryVersion() {
-  static std::string buf;
-  if (buf.empty()) {
-    llvm::raw_string_ostream OS(buf);
-    OS << getClangRepositoryPath();
-    llvm::StringRef Revision = getClangRevision();
-    if (!Revision.empty())
-      OS << ' ' << Revision;
-  }
+std::string getClangFullRepositoryVersion() {
+  std::string buf;
+  llvm::raw_string_ostream OS(buf);
+  OS << getClangRepositoryPath();
+  llvm::StringRef Revision = getClangRevision();
+  if (!Revision.empty())
+    OS << ' ' << Revision;
   return buf;
 }
   
-const char *getClangFullVersion() {
-  static std::string buf;
-  if (buf.empty()) {
-    llvm::raw_string_ostream OS(buf);
+std::string getClangFullVersion() {
+  std::string buf;
+  llvm::raw_string_ostream OS(buf);
 #ifdef CLANG_VENDOR
-    OS << CLANG_VENDOR;
+  OS << CLANG_VENDOR;
 #endif
-    OS << "clang version " CLANG_VERSION_STRING " ("
-       << getClangFullRepositoryVersion() << ')';
-  }
-  return buf.c_str();
+  OS << "clang version " CLANG_VERSION_STRING " ("
+     << getClangFullRepositoryVersion() << ')';
+  return buf;
 }
-  
+
 } // end namespace clang
diff --git a/tools/CIndex/CIndex.cpp b/tools/CIndex/CIndex.cpp
index dc1608bbc8..8d887eb32e 100644
--- a/tools/CIndex/CIndex.cpp
+++ b/tools/CIndex/CIndex.cpp
@@ -2169,8 +2169,8 @@ void clang_disposeString(CXString string) {
   
 extern "C" {
 
-const char *clang_getClangVersion() {
-  return getClangFullVersion();
+CXString clang_getClangVersion() {
+  return CIndexer::createCXString(getClangFullVersion(), true);
 }
 
 } // end: extern "C"
-- 
2.40.0