[gentoo-dev] [PATCH 3/3] kernel-build.eclass: set toolchain variables more comprehensibly

[Andrew Ammerlaan <andrewammerlaan@gentoo.org>]

From: Alfred Wingate <parona@protonmail.com>

Building on llvm profiles is problematic if toolchain variables are not properly
set. So set HOSTLD and HOSTAR to match at least the kernels own LLVM=1 variable
to ensure a smoother build for end users.

For example an unset HOSTLD causes issues as it defaults to GNU ld
otherwise.

https://docs.kernel.org/kbuild/llvm.html#the-llvm-argument

Signed-off-by: Alfred Wingate <parona@protonmail.com>
Closes: https://github.com/gentoo/gentoo/pull/37690
Signed-off-by: Andrew Ammerlaan <andrewammerlaan@gentoo.org>
---
 eclass/kernel-build.eclass | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/eclass/kernel-build.eclass b/eclass/kernel-build.eclass
index f478cf636a27..893a1bdb449c 100644
--- a/eclass/kernel-build.eclass
+++ b/eclass/kernel-build.eclass
@@ -187,6 +187,10 @@ kernel-build_src_configure() {
 	fi
 
 	# force ld.bfd if we can find it easily
+	local HOSTLD="$(tc-getBUILD_LD)"
+	if type -P "${HOSTLD}.bfd" &>/dev/null; then
+		HOSTLD+=.bfd
+	fi
 	local LD="$(tc-getLD)"
 	if type -P "${LD}.bfd" &>/dev/null; then
 		LD+=.bfd
@@ -198,6 +202,8 @@ kernel-build_src_configure() {
 
 		HOSTCC="$(tc-getBUILD_CC)"
 		HOSTCXX="$(tc-getBUILD_CXX)"
+		HOSTLD="${HOSTLD}"
+		HOSTAR="$(tc-getBUILD_AR)"
 		HOSTCFLAGS="${BUILD_CFLAGS}"
 		HOSTLDFLAGS="${BUILD_LDFLAGS}"
 
@@ -210,6 +216,7 @@ kernel-build_src_configure() {
 		STRIP="$(tc-getSTRIP)"
 		OBJCOPY="$(tc-getOBJCOPY)"
 		OBJDUMP="$(tc-getOBJDUMP)"
+		READELF="$(tc-getREADELF)"
 
 		# we need to pass it to override colliding Gentoo envvar
 		ARCH=$(tc-arch-kernel)
-- 
2.45.2