Question

I’m under Ubuntu 12.04 x86 64 bit, I have compiled a 32 bit version of llvm/clang from the official svn repository successfully.

I’m now trying to compile c++ code for ARM, at this point i don’t care about platform versions like armv5 vs armv7a, I’m focusing on how the platform switch works for clang:

llvm-config --targets-built
ARM CellSPU CppBackend Hexagon Mips MBlaze MSP430 NVPTX PowerPC Sparc X86 XCore

but the following command doesn’t work

clang++ -arch arm soft.cpp -o soft_ARM

the output is

clang-3: warning: argument unused during compilation: '-arch arm'

I have also tried gcc-like variants or other combinations like -arch=arm, -arch=armv7a, -march=armv5 but nothing seems to work.

After reading some docs i noticed that clang works for ARM only under MAC OS X / Darwin and it’s not supposed to work for ARM under other OS.

How i can compile for ARM with clang and what the output of llvm-config --targets-built is really about ?

Answer 1

-arch is darwin-only feature. You should use -target on non-darwin platforms. Alternatively, compile llvm/target specifying target triplet or create a link from clang to -clang. In your case the target triplet would be arm-none-linux-gnueabi