Building LLVM and Clang with Xcode 5

Clang Frontend
#1

Hi All,

I’m new to hacking on clang and I’m trying to build with Xcode.

I got the code from the git mirror, first checking out llvm, and then clang into llvm/tools/clang, compiler-rt code to llvm/project/compiler-rt and the test suite to llvm/projects/test-suite (I basically followed the instructions here: http://llvm.org/docs/GettingStarted.html#git-mirror)

I then used cmake to generate the LLVM xcode project.

When I build the ALL_BUILD target I very quickly get the following error compiling asan_activation.c:

lang: error: invalid argument ‘-mmacosx-version-min=10.9’ not allowed with ‘-mios-simulator-version-min=7.0’

Any thoughts on what is going wrong? I am a little surprised because I haven’t even tried to change anything yet.

Thanks,

Guy.

#2

Hi ,

knowing the exact commands would be good, but this usually works well for me:

mkdir llvm_build_xcode
cd llvm_build_xcode
cmake -G Xcode -DCMAKE_BUILD_TYPE=Debug /Path/To/llvm
open Xcode project and compile.

Let me know if it works for you

Marcello

#3

Hi ,

knowing the exact commands would be good, but this usually works well for me:

mkdir llvm_build_xcode
cd llvm_build_xcode
cmake -G Xcode -DCMAKE_BUILD_TYPE=Debug /Path/To/llvm
open Xcode project and compile.

Let me know if it works for you

Marcello

#4

Seems like my mail client had some problems and sent too many messages, sorry about that :stuck_out_tongue:

Marcello

#5

If you just want to hack on clang, remove the compiler-rt and test-suite checkouts. Clang has tests in its source checkout that are small, targeted, and run in ~1min.

The specific error you got has something to do with cross-compiling the sanitizers for iOS from Mac OS, which I’m guessing you may not care about. Here’s an old thread about it:
http://clang-developers.42468.n3.nabble.com/CMake-Xcode-build-fails-trying-to-build-asan-td4037916.html

#6

Hi Marcello,

That didn’t seem to solve my problem… My commands were almost the same as yours the first time anyway… I just left out -DCMAKE_BUILD_TYPE=Debug.

Anyhow, there was another email which suggested that I can probably leave out the compiler-rt stuff. I’m going to give that at try.

Thanks,

Guy.

#7

Hi Reid,

I will try removing the compiler-rt and test suite checkouts and see how it goes.

Thanks,

Guy.

#8

Ouch, you are right, I also use other CMake options actually , which are :

Turning off LLVM_EXTERNAL_COMPILER_RT_BUILD and LLVM_BUILD_EXTERNAL_COMPILER_RT with Xcode because I don’t need those.

Marcello