[llvm-dev] llvm cross compilation issue

[Tobias Hieta via llvm-dev]

Hello,

There might be a smarter way - but I just build the tree twice:

mkdir native ; cd native ; cmake -GNinja .. ; ninja
mkdir target ; cd target ; cmake -GNinja
-DCMAKE_TOOLCHAIN_FILE=cross.cmake
-DLLVM_TABLEGEN_PATH=../native/bin/llvm-tblgen ..

I know there are runtime builds as well - but I am not familiar with it.

-- Tobias

On Thu, Sep 17, 2020 at 3:28 PM Денис Онищенко via llvm-dev
<llvm-dev at lists.llvm.org> wrote:
>
> I am trying to compile llvm using a toolchain file where I have
> specified the target system and compilers as suggested at
> https://cmake.org/cmake/help/latest/manual/cmake-toolchains.7.html#cross-compilation-tool
> chain:
>
> set(CMAKE_SYSTEM_NAME Linux)
> set(CMAKE_SYSTEM_PROCESSOR arm)
>
> set(CMAKE_C_COMPILER arm-unknown-linux-gnueabi-gcc)
> set(CMAKE_CXX_COMPILER arm-unknown-linux-gnueabi-g++)
>
> But the problem is that native tools like llvm-config, llvm-tblgen and
> clang-tblgen, which must be built by the native compiler, are also
> created by the target compiler.
>
> What cmake / "toolchain file" options should I use to use the native
> (host) compiler for these native tools (which are placed in the NATIVE
> subdirectory), and target compilers for other binaries and libraries?
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