[CMake] Change compiler for certain files in the project

[Thompson, KT]

Aaron,

Another way to do this is by using external project, but it is very 'hacky'.  A good place to look for examples is CMake's own AddCMakeFortranSubdirectory features.  This is designed to allow Fortran to be compiled with MinGW when the main project uses a VisualStudio generator. The same general logic would work to allow you to process a subdirectory with a different toolchain.

-kt

-----Original Message-----
From: CMake [mailto:cmake-bounces at cmake.org] On Behalf Of P F via CMake
Sent: Saturday, October 28, 2017 9:22 AM
To: Aaron Boxer <boxerab at gmail.com>
Cc: cmake <cmake at cmake.org>
Subject: Re: [CMake] Change compiler for certain files in the project


> On Oct 28, 2017, at 9:50 AM, Aaron Boxer <boxerab at gmail.com> wrote:
> 
> Hello,
> 
> I have a cmake project on linux, and I would like to change the compiler
> for certain files from g++ to  another, llvm-based compiler called hcc.
> (hcc is AMDs HIP compiler for GPGPU)
> 
> 
> Is there a way of doing this in my cmake file ?

There isn’t a simple way to do that. The FindCUDA and FindHIP cmake modules do that, but its not at all easy to follow, and brings its own set of issues.

Of course, why do you need to use g++ to compile host code? Being clang-based hcc should be able to compile any g++ code. So you can just use hcc as the compiler for everything and then link with the `hccrt` cmake target(provided by `find_package(hcc)`) which will enable GPU compiling when you want to compile code for the device.


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