[bug#49794] [PATCH core-updates-frozen] fix mesa-opencl and mesa-opencl-icd build failure

[John Kehayias via Guix-patches via <guix-patches@gnu.org>]

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Hello,

Attached is a patch to fix failures for mesa-opencl and mesa-opencl-icd building with the update to 21.1.6 for Mesa. This is from upstream, a change in meson.build that removed LLVM targets (for CMake users it seems) but then breaks compilation for us on a shared library LLVM build.

https://gitlab.freedesktop.org/mesa/mesa/-/issues/4443

https://gitlab.freedesktop.org/mesa/mesa/-/issues/4302

And the commit that changed it: https://gitlab.freedesktop.org/mesa/mesa/-/commit/80817b6e344258ac9b955f824ebf9019a0fc1610

The patch restores 'all-targets' to llvm_modules and successfully builds. Apologies about the long line and I'm still guessing at some of the scheme patching code. Since Mesa takes a while to build I didn't want to go through many iterations to get the code cleaner. Please feel free to make it better, and I would think mesa-opencl-icu should be able to inherit the patch from mesa-opencl, but I didn't try to do that.

Thanks,
John

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From 92744e9f54db9931253e17245d2c3841c6ac6369 Mon Sep 17 00:00:00 2001
From: John Kehayias <john.kehayias@protonmail.com>
Date: Sat, 31 Jul 2021 13:57:37 -0400
Subject: [PATCH] gnu: mesa: fix mesa-opencl and mesa-opencl-icd 21.1.6

* gnu/packages/gl.scm (mesa-opencl): Restore LLVM targets to meson.build
* gnu/packages/gl.scm (mesa-opencl-icd): Restore LLVM targets to meson.build
---
 gnu/packages/gl.scm | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/gnu/packages/gl.scm b/gnu/packages/gl.scm
index e316352377..cdd98dd8fd 100644
--- a/gnu/packages/gl.scm
+++ b/gnu/packages/gl.scm
@@ -474,7 +474,16 @@ from software emulation to complete hardware acceleration for modern GPUs.")
     (arguments
      (substitute-keyword-arguments (package-arguments mesa)
        ((#:configure-flags flags)
-        `(cons "-Dgallium-opencl=standalone" ,flags))))
+        `(cons "-Dgallium-opencl=standalone" ,flags))
+       ((#:phases phases)
+        `(modify-phases ,phases
+           (add-after 'unpack 'enable-llvm-platforms
+             (lambda* (#:key inputs #:allow-other-keys)
+               ;; Restore all LLVM targets in order to build with our LLVM
+               ;; as a shared library.
+               (substitute* "meson.build"
+                 (("'linker', 'coverage', 'instrumentation', 'ipo', 'irreader',")
+                  "'all-targets', 'linker', 'coverage', 'instrumentation', 'ipo', 'irreader',"))))))))
     (inputs
      `(("libclc" ,libclc)
        ,@(package-inputs mesa)))
@@ -492,6 +501,13 @@ from software emulation to complete hardware acceleration for modern GPUs.")
                 ,(delete "-Dgallium-opencl=standalone" flags)))
         ((#:phases phases)
          `(modify-phases ,phases
+            (add-after 'unpack 'enable-llvm-platforms
+              (lambda* (#:key inputs #:allow-other-keys)
+               ;; Restore all LLVM targets in order to build with our LLVM
+               ;; as a shared library.
+                (substitute* "meson.build"
+                  (("'linker', 'coverage', 'instrumentation', 'ipo', 'irreader',")
+                   "'all-targets', 'linker', 'coverage', 'instrumentation', 'ipo', 'irreader',"))))
             (add-after 'install 'mesa-icd-absolute-path
               (lambda _
                 ;; Use absolute path for OpenCL platform library.
-- 
2.32.0