How to build with multiple toolchains as a part of a single build command

[Garrett Kajmowicz]

I have a build scenario where I need to compile a set of libraries with multiple toolchains as a part of a single "blaze build" operation.

As a simplified example, consider a graphics processing application which will, at run-time, determine the processor features supported and load a different version of the library which does the actual math work. Different toolchains might be the Intel compiler, and gcc with different linking options. And for $reasons this is implemented as separate toolchains.

In this case it's obvious that a "product build" involves building the external application once for the target platform, and the library multiple times.

How do I go about annotating the BUILD file that I need to do the build of the libraries for each of a set of toolchains?

[Alex Garcia Mayans]

I have an example on how to achieve that using transitions here:

https://github.com/thekyz/snippets/tree/master/multi_platform

Just build ‘//board/…’ in that folder and you will see 2 packages being built with 2 different tool chains using the same app as source.

Regards,

Alexandre Garcia Mayans

On 2 Jun 2021, at 19:09, Garrett Kajmowicz <garrett....@gmail.com> wrote:

I have a build scenario where I need to compile a set of libraries with multiple toolchains as a part of a single "blaze build" operation.

As a simplified example, consider a graphics processing application which will, at run-time, determine the processor features supported and load a different version of the library which does the actual math work. Different toolchains might be the Intel compiler, and gcc with different linking options. And for $reasons this is implemented as separate toolchains.

In this case it's obvious that a "product build" involves building the external application once for the target platform, and the library multiple times.

How do I go about annotating the BUILD file that I need to do the build of the libraries for each of a set of toolchains?

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[Garrett Kajmowicz]

I finally managed to get this implemented and it works quite well. Thank you!

-     Garrett