[Buildroot] [PATCH v2 1/2] package/mesa3d: explicitly enable llvm for host-mesa3d

[Thomas Devoogdt <thomas@devoogdt.com>]

LLVM is already implicitly enabled for host-mesa3d when
BR2_PACKAGE_MESA3D_NEEDS_PRECOMP_COMPILER is selected. This blind
option is automatically enabled when LLVM is required by drivers such
as intel-iris, panfrost, imagination, or intel-vulkan.

The BR2_PACKAGE_MESA3D_LLVM option also independently selects host-llvm,
but this change makes the dependency more explicit for host-mesa3d
builds.

Note that disabling LLVM is not possible for host-mesa3d, as the build
will fail with:
../../../br-test-pkg/bootlin-armv5-uclibc/build/host-mesa3d-25.3.2/meson.build:847:3: ERROR: Feature llvm cannot be disabled: CLC requires LLVM

Signed-off-by: Thomas Devoogdt <thomas@devoogdt.com>
---
v2: Explicitly added the llvm flag to host-mesa3d configuration,
    see https://lore.kernel.org/buildroot/20251226101445.2b29f439@windsurf/.
    @bkuhls, I can see that CLC support is needed to compile the intel-iris
    driver, (commit 317260f "package/{mesa3d, mesa3d-headers}: bump version to
    25.0.6") but can you elaborate why this is required for the generic
    host-mesa3d? Perhaps some llvm related logic should be added for the host.
---
 package/mesa3d/mesa3d.mk | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/package/mesa3d/mesa3d.mk b/package/mesa3d/mesa3d.mk
index e41bf68d8ec..09b098628ab 100644
--- a/package/mesa3d/mesa3d.mk
+++ b/package/mesa3d/mesa3d.mk
@@ -297,6 +297,7 @@ HOST_MESA3D_CONF_OPTS = \
 	-Dgallium-drivers=$(subst $(space),$(comma),$(HOST_MESA3D_GALLIUM_DRIVERS-y)) \
 	-Dtools=$(subst $(space),$(comma),$(HOST_MESA3D_TOOLS)) \
 	-Dinstall-mesa-clc=true \
+	-Dllvm=enabled \
 	-Dmesa-clc=enabled \
 	-Dplatforms= \
 	-Dprecomp-compiler=enabled \
@@ -306,6 +307,7 @@ HOST_MESA3D_CONF_OPTS = \
 HOST_MESA3D_DEPENDENCIES = \
 	host-libclc \
 	host-libdrm \
+	host-llvm \
 	host-python-mako \
 	host-python-pyyaml \
 	host-spirv-tools
-- 
2.43.0

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