mesa: fix build with llvm 21 on exotic platforms (#447955)

  patches = [

    ./opencl.patch

    # https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/37027

    ./gallivm-llvm-21.patch

  ];

  postPatch = ''

From eca19331d94005485de5246cfa87a21621486cd8 Mon Sep 17 00:00:00 2001

From: no92 <no92.mail@gmail.com>

Date: Wed, 27 Aug 2025 16:02:31 +0200

Subject: [PATCH] gallivm: support LLVM 21

LLVM PR#146819 changed the signature of `setObjectLinkingLayerCreator`,

dropping the Triple argument. The PR was first included in the LLVM 21

series, and the new signature is gated behind a version check for that.

`LLVMOrcThreadSafeContextGetContext` was removed in LLVM commit b18e5b6,

and the ORC examples in the LLVM tree seem to just create a context

instead, which we replicate here.

With this commit, mesa successfully builds the llvmpipe gallium driver

on riscv64 with LLVM 21.1.0.

Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/13785

Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/13852

Reviewed-by: David Heidelberg <david@ixit.cz>

---

 src/gallium/auxiliary/gallivm/lp_bld_init_orc.cpp | 7 ++++++-

 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/gallium/auxiliary/gallivm/lp_bld_init_orc.cpp b/src/gallium/auxiliary/gallivm/lp_bld_init_orc.cpp

index 3d2b8cf81bc0c..0be69b02b6eef 100644

--- a/src/gallium/auxiliary/gallivm/lp_bld_init_orc.cpp

+++ b/src/gallium/auxiliary/gallivm/lp_bld_init_orc.cpp

@@ -340,7 +340,12 @@ LPJit::LPJit() :jit_dylib_count(0) {

          .setJITTargetMachineBuilder(std::move(JTMB))

 #ifdef USE_JITLINK

          .setObjectLinkingLayerCreator(

+#if LLVM_VERSION_MAJOR >= 21

+            /* LLVM 21 removed the Triple argument */

+            [&](ExecutionSession &ES) {

+#else

             [&](ExecutionSession &ES, const llvm::Triple &TT) {

+#endif

                return std::make_unique<ObjectLinkingLayer>(

                   ES, ExitOnErr(llvm::jitlink::InProcessMemoryManager::Create()));

             })

@@ -552,7 +557,7 @@ init_gallivm_state(struct gallivm_state *gallivm, const char *name,

    gallivm->cache = cache;

    gallivm->_ts_context = context->ref;

-   gallivm->context = LLVMOrcThreadSafeContextGetContext(context->ref);

+   gallivm->context = LLVMContextCreate();

    gallivm->module_name = LPJit::get_unique_name(name);

    gallivm->module = LLVMModuleCreateWithNameInContext(gallivm->module_name,

-- 

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