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From: "howarth at nitro dot med.uc.edu" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug bootstrap/55289] darwin bootstrap fails due to missing libsanitizer/interception/mach_override directory and files
Date: Tue, 13 Nov 2012 14:30:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55289

--- Comment #7 from Jack Howarth <howarth at nitro dot med.uc.edu> 2012-11-13 14:29:57 UTC ---
(In reply to comment #6)
> > what you need is to have "-framework CoreFoundation" on the link line - and I
> > guess the configury  &c. needs to arrange this.
> 
> When compiled with -faddress-sanitizer -framework CoreFoundation -lasan, the
> executable fails to run with
> 
> dyld: lazy symbol binding failed: Symbol not found:
> ___asan_mach_override_ptr_custom
>   Referenced from: /opt/gcc/gcc4.8w/lib/libasan.0.dylib
>   Expected in: flat namespace
> 
> dyld: Symbol not found: ___asan_mach_override_ptr_custom
>   Referenced from: /opt/gcc/gcc4.8w/lib/libasan.0.dylib
>   Expected in: flat namespace
> 
> Trace/BPT trap

This symbol is contained in mach_override.c which we currently don't build in
the Makefiles. Note that llvm's cmake files show mach_override.c is compiled
with -std=c99.

# Custom flags:
projects/compiler-rt/lib/interception/CMakeFiles/RTInterception.osx.dir/mach_override/mach_override.c.o_FLAGS
= -std=c99 

The interception/mach_override/mach_override.c.o object file will need to be
linked into both libasan.dylib and libasan.a.