Merge pull request #5664 from ematejska/master

Adding getSwiftRevision().

Author: ematejska

include/swift/Basic/Version.h

@@ -149,6 +149,10 @@ std::pair<unsigned, unsigned> getSwiftNumericVersion();
 std::string getSwiftFullVersion(Version effectiveLanguageVersion =
                                 Version::getCurrentLanguageVersion());
 
+/// Retrieves the repository revision number (or identifer) from which                               
+/// this Swift was built.
+std::string getSwiftRevision();
+
 } // end namespace version
 } // end namespace swift
 

lib/Basic/Version.cpp

@@ -406,6 +406,14 @@ std::string getSwiftFullVersion(Version effectiveVersion) {
   return OS.str();
 }
 
+std::string getSwiftRevision() {
+#ifdef SWIFT_REVISION
+  return SWIFT_REVISION;
+#else
+  return "";
+#endif
+}
+
 } // end namespace version
 } // end namespace swift