Make this assertion more self-explanatory.
llvm-svn: 10879
diff --git a/llvm/lib/Target/TargetInstrInfo.cpp b/llvm/lib/Target/TargetInstrInfo.cpp
index 0f9015f..a3131bb 100644
--- a/llvm/lib/Target/TargetInstrInfo.cpp
+++ b/llvm/lib/Target/TargetInstrInfo.cpp
@@ -23,13 +23,13 @@
//
const TargetInstrDescriptor* TargetInstrDescriptors = 0;
-
TargetInstrInfo::TargetInstrInfo(const TargetInstrDescriptor* Desc,
unsigned DescSize,
unsigned NumRealOpCodes)
: desc(Desc), descSize(DescSize), numRealOpCodes(NumRealOpCodes) {
// FIXME: TargetInstrDescriptors should not be global
- assert(TargetInstrDescriptors == NULL && desc != NULL);
+ assert(TargetInstrDescriptors == NULL && desc != NULL
+ && "TargetMachine data structure corrupt; maybe you tried to create another TargetMachine? (only one may exist in a program)");
TargetInstrDescriptors = desc; // initialize global variable
}