Pre-commit commit to get URL keyword expansion for Clang version information
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@83319 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Basic/Version.cpp b/lib/Basic/Version.cpp
new file mode 100644
index 0000000..3a51ccb
--- /dev/null
+++ b/lib/Basic/Version.cpp
@@ -0,0 +1,63 @@
+//===- Version.cpp - Clang Version Number -----------------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines several version-related utility functions for Clang.
+//
+//===----------------------------------------------------------------------===//
+#include <cstring>
+#include <cstdlib>
+using namespace std;
+
+namespace clang {
+
+const char *getClangSubversionPath() {
+ static const char *Path = 0;
+ if (Path)
+ return Path;
+
+ static char URL[] = "$URL$";
+ char *End = strstr(URL, "/lib/Basic");
+ if (End)
+ *End = 0;
+
+ char *Begin = strstr(URL, "cfe/");
+ if (Begin) {
+ Path = Begin + 4;
+ return Path;
+ }
+
+ Path = URL;
+ return Path;
+}
+
+
+unsigned getClangSubversionRevision() {
+#ifndef SVN_REVISION
+ return 0;
+#else
+ // What follows is an evil trick. We can end up getting three different
+ // kinds of results when asking for the Subversion information:
+ // - if SVN_REVISION is a number, we return that number (adding 0 to it is
+ // harmless).
+ // - if SVN_REVISION is "exported" (for an tree without any Subversion
+ // info), we end up referencing the local variable "exported" and adding
+ // zero to it, and we return 0.
+ // - if SVN_REVISION is empty (because "svn info" returned no results),
+ // the "+" turns into a unary "+" operator and we return 0.
+ //
+ // Making this less ugly requires doing more computation in the CMake- and
+ // Makefile-based build systems, with all sorts of checking to make sure we
+ // don't end up breaking this build. It's better this way. Really.
+ const unsigned exported = 0;
+ (void)exported;
+ return SVN_REVISION + 0;
+#endif
+}
+
+} // end namespace clang