From 515b5b379f3508f36f647bfdafce409e28a3d90b Mon Sep 17 00:00:00 2001
From: Reid Spencer <rspencer@reidspencer.com>
Date: Mon, 5 Jun 2006 16:22:56 +0000
Subject: [PATCH] Make it possible to override the standard version printer.
 Not all tools built with CommandLine.h will want the --version option to
 report that the tool belongs to LLVM. To override simply pass a void func()
 to the cl::SetVersionPrinter() function and that void func() will be called
 when it is time to print the version information.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28687 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/Support/CommandLine.h |  7 +++++
 lib/Support/CommandLine.cpp        | 47 ++++++++++++++++++------------
 2 files changed, 36 insertions(+), 18 deletions(-)

diff --git a/include/llvm/Support/CommandLine.h b/include/llvm/Support/CommandLine.h
index 19b5f29fb7f..8517032fefe 100644
--- a/include/llvm/Support/CommandLine.h
+++ b/include/llvm/Support/CommandLine.h
@@ -48,6 +48,13 @@ void ParseCommandLineOptions(int &argc, char **argv,
 void ParseEnvironmentOptions(const char *progName, const char *envvar,
                              const char *Overview = 0);
 
+///===---------------------------------------------------------------------===//
+/// SetVersionPrinter - Override the default (LLVM specific) version printer
+///                     used to print out the version when --version is given
+///                     on the command line. This gives other systems using the
+///                     CommandLine utilities to print their own version string.
+void SetVersionPrinter(void (*func)());
+
 //===----------------------------------------------------------------------===//
 // Flags permitted to be passed to command line arguments
 //
diff --git a/lib/Support/CommandLine.cpp b/lib/Support/CommandLine.cpp
index 90867e7da71..4b3a1d8f7d2 100644
--- a/lib/Support/CommandLine.cpp
+++ b/lib/Support/CommandLine.cpp
@@ -951,24 +951,6 @@ public:
   }
 };
 
-class VersionPrinter {
-public:
-  void operator=(bool OptionWasSpecified) {
-    if (OptionWasSpecified) {
-      std::cout << "Low Level Virtual Machine (" << PACKAGE_NAME << ") "
-                << PACKAGE_VERSION << " (see http://llvm.org/)";
-#ifndef NDEBUG
-      std::cout << " ASSERTIONS ENABLED\n";
-#else
-      std::cout << "\n";
-#endif
-      getOpts().clear();  // Don't bother making option dtors remove from map.
-      exit(1);
-    }
-  }
-};
-
-
 // Define the two HelpPrinter instances that are used to print out help, or
 // help-hidden...
 //
@@ -983,6 +965,31 @@ cl::opt<HelpPrinter, true, parser<bool> >
 HHOp("help-hidden", cl::desc("Display all available options"),
      cl::location(HiddenPrinter), cl::Hidden, cl::ValueDisallowed);
 
+void (*OverrideVersionPrinter)() = 0;
+
+class VersionPrinter {
+public:
+  void operator=(bool OptionWasSpecified) {
+    if (OptionWasSpecified) {
+      if (OverrideVersionPrinter == 0) {
+        std::cout << "Low Level Virtual Machine (" << PACKAGE_NAME << ") "
+                  << PACKAGE_VERSION << " (see http://llvm.org/)";
+#ifndef NDEBUG
+        std::cout << " ASSERTIONS ENABLED\n";
+#else
+        std::cout << "\n";
+#endif
+        getOpts().clear();  // Don't bother making option dtors remove from map.
+        exit(1);
+      } else {
+        (*OverrideVersionPrinter)();
+        exit(1);
+      }
+    }
+  }
+};
+
+
 // Define the --version option that prints out the LLVM version for the tool
 VersionPrinter VersionPrinterInstance;
 cl::opt<VersionPrinter, true, parser<bool> >
@@ -1002,3 +1009,7 @@ void cl::PrintHelpMessage() {
   // to make it look like --help was given, so we assign true.
   NormalPrinter = true;
 }
+
+void cl::SetVersionPrinter(void (*func)()) {
+  OverrideVersionPrinter = func;
+}