15992 2025-10-09 17:04:04 +0000 Unexpected behaviour with TOOLCHAIN 2026-03-12 15:14:14 +0000 1 1 7 Build System, Metadata & Runtime OE-Core devtools / tool chain 5.2 x86 Multiple RESOLVED FIXED Medium+ normal 5.3 M4 1 ross.burton ross.burton antonin.godard meta.mr.watcher meta.watcher raj.khem randy.macleod --- --- Yes (doc changes required) oldest_to_newest 102900 0 ross.burton 2025-10-09 17:04:04 +0000 If I set TOOLCHAIN=clang in local.conf and then build a native recipe, the overrides that are used as not quite as expected: $ bitbake-getvar -r gn-native --value OVERRIDES linux:aarch64:pn-gn-native:layer-core::poky:class-native:toolchain-clang:forcevariable Specifically, "toolchain-clang" is unexpected because the build will be using the host GCC. I suspect the answer is "set PREFERRED_TOOLCHAIN instead", which is fine. But should native.bbclass be setting TOOLCHAIN=TOOLCHAIN_NATIVE too? 102901 1 raj.khem 2025-10-09 20:23:10 +0000 (In reply to Ross Burton from comment #0) > If I set TOOLCHAIN=clang in local.conf and then build a native recipe, the > overrides that are used as not quite as expected: > > $ bitbake-getvar -r gn-native --value OVERRIDES > linux:aarch64:pn-gn-native:layer-core::poky:class-native:toolchain-clang: > forcevariable > > Specifically, "toolchain-clang" is unexpected because the build will be > using the host GCC. > PREFERRED_TOOLCHAIN_{TARGET|NATIVE|SDK} are new interfaces > I suspect the answer is "set PREFERRED_TOOLCHAIN instead", which is fine. > But should native.bbclass be setting TOOLCHAIN=TOOLCHAIN_NATIVE too? yeah perhaps might be ok, I also wonder if we have similar issue with SDK case. 102956 2 ross.burton 2025-10-16 14:39:37 +0000 We should at least have something in the migration guide about this. We should say that clang has been integrated into core, meta-clang is no longer essential, but when picking a compiler at a distro level PREFERRED_TOOLCHAIN should be used instead of TOOLCHAIN. Antonin, can you add something like that? 102971 3 antonin.godard 2025-10-16 15:18:05 +0000 I added a note on that to the release note updates I sent today: > .. warning:: > The :term:`TOOLCHAIN` should **not** be set globally. For overridding > the toolchain globally, use :term:`PREFERRED_TOOLCHAIN_TARGET`, > :term:`PREFERRED_TOOLCHAIN_NATIVE` and :term:`PREFERRED_TOOLCHAIN_SDK`. (I realize now I'm missing "variable" after TOOLCHAIN, will fix that) https://lore.kernel.org/yocto-docs/20251016-release-note-5-3-second-hunk-v1-17-20f21db1f93c@bootlin.com/ Do you think that's enough or should I mention something else? 104609 4 ross.burton 2026-03-12 15:14:14 +0000 The doc changes look good.