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Hack to pass the full linux-mod-r1 toolchain to make during ./configure.
Not needed at build time given can pass it normally then.
Eclass has workarounds, compiler/version matching, and its own set of
user variables which creates disparity between ebuilds if not used.
For the (normal) alternative: KERNEL_{CC,LD} alone is insufficient,
but combining with KERNEL_LLVM=1 when CC_IS_CLANG will allow it
to work for *most* people (will likely still need KERNEL_LD from
linux-mod-r1, or ThinLTO kernels may fail with sandbox violations).
Note KERNEL_* also cause failure if they contain spaces.
https://bugs.gentoo.org/865157
--- a/config/kernel.m4
+++ b/config/kernel.m4
@@ -646,6 +646,5 @@
AC_TRY_COMMAND([
KBUILD_MODPOST_NOFINAL="$5" KBUILD_MODPOST_WARN="$6"
- make modules -k -j$TEST_JOBS ${KERNEL_CC:+CC=$KERNEL_CC}
- ${KERNEL_LD:+LD=$KERNEL_LD} ${KERNEL_LLVM:+LLVM=$KERNEL_LLVM}
+ make modules -k -j$TEST_JOBS '${GENTOO_MAKEARGS_EVAL}'
CONFIG_MODULES=y CFLAGS_MODULE=-DCONFIG_MODULES
-C $LINUX_OBJ $ARCH_UM M=$PWD/$1 >$1/build.log 2>&1])
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