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-rw-r--r--lib/CodeGen/LLVMTargetMachine.cpp5
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/CodeGen/LLVMTargetMachine.cpp b/lib/CodeGen/LLVMTargetMachine.cpp
index 8f463e2d3f..3bd1d6071e 100644
--- a/lib/CodeGen/LLVMTargetMachine.cpp
+++ b/lib/CodeGen/LLVMTargetMachine.cpp
@@ -114,6 +114,11 @@ LLVMTargetMachine::LLVMTargetMachine(const Target &T, StringRef Triple,
: TargetMachine(T, Triple, CPU, FS) {
CodeGenInfo = T.createMCCodeGenInfo(Triple, RM, CM);
AsmInfo = T.createMCAsmInfo(Triple);
+ // TargetSelect.h moved to different directory between LLVM 2.9 and 3.0,
+ // and if the old one gets included then MCAsmInfo will be NULL and we'd crash
+ // later.
+ // Provide the user a useful error message about whats wrong.
+ assert(AsmInfo && "MCAsmInfo not initialized. Make sure you include the correct TargetSelect.h!");
}
bool LLVMTargetMachine::addPassesToEmitFile(PassManagerBase &PM,