Hi, Just to briefly share with wider audience progress on cross-compiling for ARM using llvm/clang. I managed to cross-compile kernel with clang for Marvel SoC and run world compiled with gcc in multiuser. It works stable and I didn't notice any issues so far. Cross compiling even works from MacOS. Caveat is that it still requires binutils as integrated assembler is not stable enough. The real benefit of having clang in place is support of new ARM architectures (ARMv6, ARMv7) which are not supported in last GPLv2 gcc/binutils. With regards to building world, main issue is ARM ABI. FreeBSD uses ATPCS[1] procedure call standard which is older one. New one is called AAPCS [2] and introduces some important performance related stuff. llvm/clang doesn't support older ATPCS standard so it fails to build some libraries. Andrew already did some work on moving to AAPCS[3]. When we will have AAPCS implemented then I expect that building of world should work without any major issues. Damjan [1] http://infocenter.arm.com/help/topic/com.arm.doc.espc0002/ATPCS.pdf [2] http://infocenter.arm.com/help/topic/com.arm.doc.ihi0042d/IHI0042D_aapcs.pdf [3] http://svnweb.freebsd.org/base/projects/arm_eabi/Received on Mon Jul 04 2011 - 13:11:11 UTC
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