[whinlatter][PATCH v1 1/2] mesa: fix build error with llvmpipe gallium driver

["João Marcos Costa" <joaomarcos.costa@bootlin.com>]

For RISC-V, and if the PACKAGECONFIG 'gallium-llvm' is enabled, mesa's
do_compile fails due to a change in setObjectLinkingLayerCreator's
signature. This change was first included in LLVM v21.

This issue is further described below:
https://gitlab.freedesktop.org/mesa/mesa/-/issues/13852

Backport the fix - from upstream - to Whinlatter.

Signed-off-by: João Marcos Costa <joaomarcos.costa@bootlin.com>
---
 .../files/0001-gallivm-support-LLVM-21.patch  | 56 +++++++++++++++++++
 meta/recipes-graphics/mesa/mesa.inc           |  1 +
 2 files changed, 57 insertions(+)
 create mode 100644 meta/recipes-graphics/mesa/files/0001-gallivm-support-LLVM-21.patch

diff --git a/meta/recipes-graphics/mesa/files/0001-gallivm-support-LLVM-21.patch b/meta/recipes-graphics/mesa/files/0001-gallivm-support-LLVM-21.patch
new file mode 100644
index 0000000000..cf3bdd36cf
--- /dev/null
+++ b/meta/recipes-graphics/mesa/files/0001-gallivm-support-LLVM-21.patch
@@ -0,0 +1,56 @@
+From cd129dbf8af2d16b1243f2ce287ff69c6a5dc557 Mon Sep 17 00:00:00 2001
+From: no92 <no92.mail@gmail.com>
+Date: Wed, 27 Aug 2025 16:02:31 +0200
+Subject: 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>
+Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/37027>
+
+Upstream-Status: Backport [https://cgit.freedesktop.org/mesa/mesa/commit/?id=cd129dbf8af2d16b1243f2ce287ff69c6a5dc557]
+---
+ 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 6651ea439da..e5d8e461dd6 100644
+--- a/src/gallium/auxiliary/gallivm/lp_bld_init_orc.cpp
++++ b/src/gallium/auxiliary/gallivm/lp_bld_init_orc.cpp
+@@ -339,7 +339,12 @@ 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()));
+             })
+@@ -551,7 +556,7 @@ 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,
+-- 
+cgit v1.2.3
+
diff --git a/meta/recipes-graphics/mesa/mesa.inc b/meta/recipes-graphics/mesa/mesa.inc
index 3124db0986..a35dff3347 100644
--- a/meta/recipes-graphics/mesa/mesa.inc
+++ b/meta/recipes-graphics/mesa/mesa.inc
@@ -17,6 +17,7 @@ PE = "2"
 SRC_URI = "https://archive.mesa3d.org/mesa-${PV}.tar.xz \
            file://0001-meson-misdetects-64bit-atomics-on-mips-clang.patch \
            file://0001-freedreno-don-t-encode-build-path-into-binaries.patch \
+           file://0001-gallivm-support-LLVM-21.patch \
 "
 
 SRC_URI[sha256sum] = "bb6243e7a6f525febfa1e6ab50827ca4d4bfdad73812377b0ca9b6c50998b03e"
-- 
2.47.0