[LLVMdev] [compiler-rt] is the arm lib complete?

[David Chisnall]

My memory may be fuzzy, but I believe that those functions are required for ARMv6 support.  On ARMv7 and newer they are not used.  Apple only supports ARMv7 currently, and so they probably won't have encountered this problem.  We're probably going to be adding some things to compiler-rt for FreeBSD on ARM over the next year, but if you get there and do it before us then we certainly won't complain...

David

On 15 Nov 2012, at 18:33, liangh at codeaurora.org wrote:

> Hi,
> 
> I'm trying to link my objs with compiler-rt built runtime lib for arm.
> According to the compiler-rt doc, it should be able to replace libgcc.
> However, if I replace "-lgcc" with "compiler-rt.a" for a static linking,
> gcc linker complains about undefined functions. Using "nm -g", I compared
> the functions in libgcc and compiler-rt.full-arm.a and found there are
> many missing functions in compiler-rt, such as "__aeabi_dcmpeq"
> "__sync_lock_release_1" "_interwork_call_via_fp", etc.
> 
> Although I can use compiler-rt.a via using "-allow-multiple-definition" to
> override libgcc, this is an ugly solution.
> 
> Anybody know how to fully replace libgcc with compiler-rt? Do I need to
> link some other lib to totally replace libgcc when using compiler-rt, or
> compiler-rt cannot fully replace libgcc yet? I know Apple is using
> compiler-rt built runtime libs. How did they link?
> 
> Thanks.
> -Liang
> 
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