How to generate assembly code with clang in Intel syntax?

Solution 1:

As noted below by @thakis, newer versions of Clang (3.5+) accept the -masm=intel argument.

For older versions, this should get clang to emit assembly code with Intel syntax:

clang++ -S -mllvm --x86-asm-syntax=intel test.cpp

You can use -mllvm <arg> to pass in llvm options from the clang command line. Sadly this option doesn't appear to be well documented, and thus I only found it by browsing through the llvm mailing lists.

Solution 2:

As of clang r208683 (clang 3.5+), it understands -masm=intel. So if your clang is new enough, you can just use that.

Solution 3:

Presuming you can have Clang emit normal LLVM byte codes, you can then use llc to compile to assembly language, and use its --x86-asm-syntax=intel option to get the result in Intel syntax.