[cfe-dev] -fsanitize=undefined and shared libraries

[zapadinsky]

>> The issue is we emit overflow intrinsics that aren't neatly supported
>> on the platform and so a call to the supporting runtime is emitted
>> instead.  Unfortunately libgcc doesn't implement __mulodi4
>> (compiler-rt does) resulting in the undefined reference you're seeing.

>Yes, I've seen this too. The easiest solution might be to include
>compiler-rt's mulodi4.o in libclang_rt.ubsan.*.a. -- that's the approach
>I've been using when testing UBSan -- although this doesn't fix the problem
>for code not using UBSan.

ar rs libclang_rt.ubsan-i386.a mulodi4.o has solved the problem, thanks! If
ubsan is so dependent from this implementation may be it should be added to
the make script?




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