[LLVMdev] Preventing C backend from using gcc builtin functions

[Harel Cain]

Hi all,

Working with llvm 2.8 installed on Mac OS, when using the llvm-gcc frontend
and the C backend I see it converting regular (non-checking) memcpy and
memset calls to __memset_chk and __memcpy_chk already at the IR stage. Then
in the CBE output these are retained as gcc builtin functions.
In a similar manner, llvm.objectsize.* calls are replaced with
__builtin_object_size calls, another gcc builtin function.

This way the resulting C code is usable as-is only on gcc-compatible
compilers.

Is there a way, either by passing some flags to the llvm-gcc frontend, or by
specifying some other flag to llc, to prevent this from happening?


Your help is as always much appreciated,

Harel Cain
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