[LLVMdev] How to determine the architecture that clang/llvm will compile in CMake.

[Daniel Sanders]

Hi,

The default CMake options produce a compiler that is capable of targeting all the architectures that were present in the source tree. The list of supported architectures can be reduced using LLVM_TARGETS_TO_BUILD in case you want to save disk-space, compilation-time, etc.. The default architecture targeted by the resulting compiler is specified by LLVM_TARGET_ARCH and LLVM_DEFAULT_TARGET_TRIPLE.

Hope that helps.

From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu] On Behalf Of Peyton, Jonathan L
Sent: 22 May 2015 19:12
To: llvmdev at cs.uiuc.edu
Subject: [LLVMdev] How to determine the architecture that clang/llvm will compile in CMake.

I've been working on getting the LLVM OpenMP library to build smoothly alongside llvm/clang using CMake, but one problem I'm having is determining exactly which CMake option designates the architecture the compiler will compile.  I see LLVM_TARGET_ARCH, LLVM_TARGETS_TO_BUILD, LLVM_DEFAULT_TARGET_TRIPLE, etc.

I thought I should just ask which one designates the architecture the compiler will build, but I wouldn't mind an explanation for all of them :)

And yes, I've looked at http://llvm.org/docs/CMake.html<https://urldefense.proofpoint.com/v2/url?u=http-3A__llvm.org_docs_CMake.html&d=AwMFAg&c=8hUWFZcy2Z-Za5rBPlktOQ&r=Mfk2qtn1LTDThVkh6-oGglNfMADXfJdty4_bhmuhMHA&m=y71jwqIExOpM3n490cz13SVJmybYCml5fWmWLCtYDQc&s=ufiTk8h8xDI8qA2S1uu1O39smCzzKWdbMH3ys2M-Cdw&e=>, but am still confused.

Any help is greatly appreciated!
-- Johnny

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