rustllvm conditional build

[lucab]

In rustllvm, Rustwrapper.cpp uses an external symbol (DebugFlag), which is conditionally exported by LLVM in llvm/Support/Debug.h in between an #ifndef NDEBUG block.

Unfortunately the Debian packaged llvm is currently configured to define it:

$ llvm-config --cxxflags
-I/usr/lib/llvm-3.1/include  -DNDEBUG -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -g -O2 -fomit-frame-pointer -fvisibility-inlines-hidden -fno-exceptions -fPIC -Woverloaded-virtual -Wcast-qual

Thus rust fails to build. Would adding a #ifndef inside LLVMSetDebug() suffice?

[brson]

I think an #ifndef inside LLVMSetDebug is fine.