[LLVMdev] Using LLVM code in projects/compiler-rt

[Alexey Samsonov]

Hi,

tl;dr How can I include LLVM headers and use code from libLLVM*.a files
when building compiler-rt libraries?

I'd like to create a symbolizer that would be used in AddressSanitizer
(ASan) and ThreadSanitizer (TSan) tools which are now part of
projects/compiler-rt (as a first step, symbolizer should be able to return
file/line info for a given address).
I'd like to use and gradually extend the interface in
"llvm/DebugInfo/DIContext.h"
I see two obstacles:

1) How can I include LLVM headers in source files inside
projects/compiler-rt?
As a local workaround, I modify configuration for ASan/TSan runtimes as
follows:
CFLAGS.asan-x86_64 := $(CFLAGS) -I$(PathToLLVMInclude)
-I$(PathToLLVMBuildInclude)
Note that I need both "/path/to/llvm_checkout/include" and
"/path/to/llvm_build/include", because some LLVM headers are generated when
LLVM is built (e.g. "llvm/Support/DataTypes.h"). This looks very broken, as
paths are hardcoded, and LLVM headers are
not included in dependencies for ASan/TSan runtime.

2) How can I use LLVM libraries when building compiler-rt?
Currently, compiler-rt builds (linux) runtime and stores it as an .a file
in "/path/to/llvm_build/Release+Asserts/lib/clang/3.2/linux".
Can I somehow make this runtime contain compiled LLVM libraries as well?
Currently I need libLLVMDebugInfo.a and libLLVMSupport.a.

For now, I patch Clang driver, so that it would pass all the necessary LLVM
libraries to linker whenever
it sees -faddress-sanitizer or -fthread-sanitizer flags, but this also
looks hacky.

TIA

-- 
Alexey Samsonov, MSK
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