r83391 was completely broken since Twines keep references to their inputs, and

some of the inputs were temporaries.  Here's a real fix for the miscompilation.
Thanks to sabre for pointing out the problem.

llvm-svn: 83417

1 files changed, 9 insertions, 4 deletions

diff --git a/llvm/lib/Support/Triple.cpp b/llvm/lib/Support/Triple.cpp
index 804769d04e9..6f805da3329 100644
--- a/llvm/lib/Support/Triple.cpp
+++ b/llvm/lib/Support/Triple.cpp
@@ -9,6 +9,7 @@
 
 #include "llvm/ADT/Triple.h"
 
+#include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/Twine.h"
 #include <cassert>
 #include <cstring>
@@ -390,10 +391,14 @@ void Triple::setOS(OSType Kind) {
 }
 
 void Triple::setArchName(const StringRef &Str) {
-  // Work around a miscompilation bug in gcc 4.0.3.
-  Twine a = getVendorName() + "-" + getOSAndEnvironmentName();
-  Twine b = Str + "-" + a;
-  setTriple(b);
+  // Work around a miscompilation bug for Twines in gcc 4.0.3.
+  SmallString<64> Triple;
+  Triple += Str;
+  Triple += "-";
+  Triple += getVendorName();
+  Triple += "-";
+  Triple += getOSAndEnvironmentName();
+  setTriple(Triple.str());
 }
 
 void Triple::setVendorName(const StringRef &Str) {