kernel-2.eclass: Respect portage toolchain variables
This backports the following commit from Gentoo upstream:
https://github.com/gentoo/gentoo/commit/55f5c68c01e791c7339144aadc1f20802791551e
Starting with kernel>=v5.7 the build system can override the
tools vars by setting LLVM=1 [1], but older kernels still use
the default GNU tools, so to be able to use a full LLVM/Clang
build, CC & co should be set to their respective portage values.
[1] a0d1c951ef08 kbuild: support LLVM=1 to switch the default tools to Clang/LLVM
BUG=b:193847062
TEST=Local builds on x64 & arm; CQ.
Change-Id: Ie99ae59fc9686f45cbf2f52249510e780fe61b33
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/3367255
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Tested-by: Manoj Gupta <manojgupta@chromium.org>
Tested-by: Adrian Ratiu <adrian.ratiu@collabora.corp-partner.google.com>
Commit-Queue: Adrian Ratiu <adrian.ratiu@collabora.corp-partner.google.com>
diff --git a/eclass/kernel-2.eclass b/eclass/kernel-2.eclass
index 351a61f..9965c99 100644
--- a/eclass/kernel-2.eclass
+++ b/eclass/kernel-2.eclass
@@ -535,7 +535,7 @@
elif type -p ${CHOST}-ar > /dev/null ; then
xmakeopts="${xmakeopts} CROSS_COMPILE=${CHOST}-"
fi
- xmakeopts="${xmakeopts} HOSTCC=$(tc-getBUILD_CC)"
+ xmakeopts="${xmakeopts} HOSTCC=$(tc-getBUILD_CC) CC=$(tc-getCC) LD=$(tc-getLD) AR=$(tc-getAR) NM=$(tc-getNM) NM=$(tc-getNM) OBJCOPY=$(tc-getOBJCOPY) READELF=$(tc-getREADELF) STRIP=$(tc-getSTRIP)"
export xmakeopts
}
