[LLVMdev] Invalid relocation types for Thumb in LLVM version 2.9

[PMon]

Hi Nick

I have the same problem when compiling code with LLVM 2.9 and linking the
objects with the linker which comes with iOS SDK 4.2 (which can be found in
"/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/"). 

When you say "newer linker" can you elaborate which linker to use?

Thanks
PMon


Nick Kledzik wrote:
> 
> The llvm compiler can now generated movt/movw instructions to create
> 32-bit constants.  Those new instructions use new relocations.  Mach-o
> uses different numbering for relocations than ELF does.  For mach-o,
> ARM_RELOC_PAIR=1 and ARM_RELOC_HALF=8.   You need a newer linker that
> understands the new relocations.
> 
> -Nick
> 
> On Feb 20, 2012, at 5:20 AM, Harel Cain wrote:
>> Hi all,
>> 
>> I'm trying to figure out a problem with relocation types 1 and 8 (as
>> observed using otool -r on ARM/Thumb object files). Earlier, when I used
>> LLVM 2.8 with llc to generate thumb (-march=thumb -mattr=+thumb2)
>> assembly listings, then assemble those using the gcc of iPhone 4.2 SDK,
>> there wasn't any problem.
>> 
>> However starting with LLVM 2.9, the same toolchain emits slightly
>> different assembly listings that after assembly into object files have
>> relocation entries of type 1 and 8 which the iPhonsOS 4.2 SDK linker
>> doesn't like (they produce warnings, and the linked binary crashes).
>> 
>> According to http://simplemachines.it/doc/aaelf.pdf, these relocation
>> types are called R_ARM_PC24 and R_ARM_ABS8. They simply weren't created
>> with the assembly listings generated with LLVM 2.8.
>> 
>> Anyone has any suggestion has to solve this? Is there any other toolchain
>> combination you can suggest in order to build Thumb object files for the
>> iOS/ARM platform? I'm not sure I'm even using LLVM the way I should here.
>> 
>> 
>> Many thanks!
>> 
>> 
>> Harel Cain
>> 
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> 
> 
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