[RFC][PATCH] tcmode-default.inc: Add LLVM_PREFERRED_VERSION

[Martin Jansa <martin.jansa@gmail.com>]

* Allow to independently set P_V for llvm* recipes and actual llvm version used in other places

* This is needed for meta-clang which provides different llvm version from clang recipes, see:
  https://github.com/kraj/meta-clang/pull/766
  https://lists.openembedded.org/g/bitbake-devel/message/14521
* as reported in:
  https://lists.openembedded.org/g/bitbake-devel/message/14523
  the other places in kirkstone and langdale which use LLVMVERSION
  (which doesn't have to be the same as LLVM_PREFERRED_VERSION) are:

  meta/classes-recipe/meson.bbclass:llvm-config = 'llvm-config${LLVMVERSION}'
  meta/recipes-graphics/mesa/mesa.inc:MESA_LLVM_RELEASE ?= "${LLVMVERSION}"

  these were removed in mickledore, but there are other places which
  use LLVMVERSION as the actual LLVM version as reported in:
  https://github.com/kraj/meta-clang/pull/766#pullrequestreview-1349170591:

  meta-intel/dynamic-layers/clang-layer/recipes-opencl/igc/intel-graphics-compiler_1.0.12812.24.bb:                  -DIGC_OPTION__LLVM_PREFERRED_VERSION=${LLVMVERSION} \
  meta-intel/dynamic-layers/clang-layer/recipes-opencl/opencl-clang/opencl-clang_14.0.0.bb:                  -DPREFERRED_LLVM_VERSION=${LLVMVERSION} \
  meta-intel/dynamic-layers/clang-layer/recipes-opencl/opencl-clang/opencl-clang_15.0.0.bb:                  -DPREFERRED_LLVM_VERSION=${LLVMVERSION} \
  meta-intel/conf/machine/include/meta-intel.inc:PREFERRED_VERSION_opencl-clang ?= "${@bb.utils.contains('LLVMVERSION', '14.0.3', '14.0.0', '15.0.0', d)}"
  meta-intel/conf/machine/include/meta-intel.inc:PREFERRED_VERSION_opencl-clang-native ?= "${@bb.utils.contains('LLVMVERSION', '14.0.3', '14.0.0', '15.0.0', d)}"
  meta-riscv/recipes-graphics/mesa/mesa-pvr.inc:MESA_LLVM_RELEASE ?= "${LLVMVERSION}"
  meta-browser/meta-chromium/recipes-browser/chromium/chromium-gn.inc:# Check the LLVMVERSION defined in the meta-clang layer. Given Chromium is
  meta-browser/meta-chromium/recipes-browser/chromium/chromium-gn.inc:# developed using new C++ features, the LLVMVERSION has to be >= 12. Otherwise,
  meta-browser/meta-chromium/recipes-browser/chromium/chromium-gn.inc:  llvm_version = d.getVar('LLVMVERSION', False)
  meta-browser/meta-chromium/recipes-browser/chromium/chromium-gn.inc:    bb.fatal("Your LLVMVERSION (%s) is lower than the minimum required "
  meta-browser/meta-chromium/recipes-browser/chromium/chromium-gn.inc:             "LLVMVERSION (%s). If you are using dunfell, make sure you "
  meta-clang/conf/layer.conf:LLVMVERSION = "16.0.0"
  meta-clang/recipes-devtools/spirv-llvm-translator/spirv-llvm-translator_git.bb:        -DBASE_LLVM_VERSION=${LLVMVERSION} \
  meta-clang/dynamic-layers/openembedded-layer/recipes-devtools/bcc/bcc_0.26.0.bb:    -DLLVM_PACKAGE_VERSION=${LLVMVERSION} \
  meta-clang/dynamic-layers/openembedded-layer/recipes-devtools/bpftrace/bpftrace_0.17.0.bb:    pvsplit = d.getVar('LLVMVERSION').split('.')

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
---
 meta/conf/distro/include/tcmode-default.inc | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/meta/conf/distro/include/tcmode-default.inc b/meta/conf/distro/include/tcmode-default.inc
index 30408e0729..2a3074b940 100644
--- a/meta/conf/distro/include/tcmode-default.inc
+++ b/meta/conf/distro/include/tcmode-default.inc
@@ -24,7 +24,11 @@ GLIBCVERSION ?= "2.37"
 LINUXLIBCVERSION ?= "6.1%"
 QEMUVERSION ?= "7.2%"
 GOVERSION ?= "1.20%"
-LLVMVERSION ?= "15.%"
+# Allow to independently set P_V for llvm* recipes and actual llvm version used in other places
+# This is needed for meta-clang which provides different llvm version from clang recipes, see:
+# https://github.com/kraj/meta-clang/pull/766
+LLVM_PREFERRED_VERSION ?= "15.%"
+LLVMVERSION ?= "${LLVM_PREFERRED_VERSION}"
 RUSTVERSION ?= "1.67%"
 
 PREFERRED_VERSION_gcc ?= "${GCCVERSION}"
@@ -77,9 +81,9 @@ PREFERRED_VERSION_go-runtime ?= "${GOVERSION}"
 PREFERRED_VERSION_nativesdk-go ?= "${GOVERSION}"
 PREFERRED_VERSION_nativesdk-go-runtime ?= "${GOVERSION}"
 
-PREFERRED_VERSION_llvm = "${LLVMVERSION}"
-PREFERRED_VERSION_llvm-native = "${LLVMVERSION}"
-PREFERRED_VERSION_nativesdk-llvm = "${LLVMVERSION}"
+PREFERRED_VERSION_llvm = "${LLVM_PREFERRED_VERSION}"
+PREFERRED_VERSION_llvm-native = "${LLVM_PREFERRED_VERSION}"
+PREFERRED_VERSION_nativesdk-llvm = "${LLVM_PREFERRED_VERSION}"
 
 # Rust toolchain preferred versions:
 
-- 
2.40.0