[cfe-dev] Cross-compiling Clang on Gentoo Linux

[Neil Nelson via cfe-dev]

Just noticed a clang-tblgen after a compile of llvm and clang using the 
clang-llvm documented method.

/home/nnelson/Documents/llvm-project/build/bin/clang-tblgen

It is apparently not copied to /usr/bin/local during the install after a 
local build, but if you have that file, you could manually copy it and 
it might be found for your purpose.

If you do not have that file, we may need to come up with a different 
plan. The first one that comes to mind is to build clang-llvm using the 
documented method and then do the copy and continue with what you are 
doing. The second one, in a stretch, might be to get the file from a 
download, depending on the hardware you are using. There is a reasonably 
good chance I could copy the file I have here to you from this x86_64.

Neil Nelson

On 7/9/20 9:48 AM, Jakov Smolic via cfe-dev wrote:

>> On Ubuntu 20.04 I have
>>
>> /usr/bin/llvm-tblgen
>> /usr/bin/llvm-tblgen-10
>> /usr/lib/llvm-10/bin/llvm-tblgen
>> /usr/local/bin/llvm-tblgen
> Yes, I have those binaries as well. `llvm-tblgen` is, unlike
> `clang-tblgen`, installed as part of the llvm package in Gentoo. I can
> successfully cross-compile llvm. Likewise as clang, llvm requires the
> `tblgen` binary for cross-compiling, but it's not an issue as it is
> installed along with other llvm components.
>
>> The first three were installed from the distribution. The last was
>> compiled from the llvm-project at github. I do not have a
>> clang- tblgen.
>>
>> Is your sequence something like this?
>> https://github.com/llvm/llvm-project
>> git clone https://github.com/llvm/llvm-project.git
>> cd llvm-project
>>
>> And then what do you do?
> I did not perform it directly like that, rather as part of the
> packaging, but Gentoo, being source-based distribution, downaloads the
> source and compiles the components from there, and sets some CMake
> options [1].
>
> Regards,
> Jakov Smolic
>
>
> [1] https://gitweb.gentoo.org/repo/gentoo.git/tree/sys-devel/llvm/llvm-10.0.0.ebuild#n249
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