[PATCH v3 08/16] kernel-yocto.bbclass: Disable ccache when rust-kernel is enabled

[Harish.Sadineni@windriver.com]

From: Yoann Congal <yoann.congal@smile.fr>

Currently, a ccache enabled build fails with:
  |   HOSTRUSTC scripts/generate_rust_target
  |   HOSTCC  scripts/kallsyms
  |   HOSTCC  scripts/sorttable
  |   HOSTCC  scripts/asn1_compiler
  |   TOUCH   include/generated/gcc-plugins.h
  |   DESCEND objtool
  | error: multiple input filenames provided (first two filenames are gcc and
.../tmp/work-shared/qemux86-64/kernel-source/scripts/generate_rust_target.rs)

when using ccache, value of "HOSTCC=cache gcc" when this value is passing
to rustc, It is thinking gcc is a input file. when ccache is not used "HOSTCC=gcc" is passed.

Disable ccache for kernel build if rust-kernel is enabled to workaround
this.

Signed-off-by: El Mehdi YOUNES <elmehdi.younes@smile.fr>
Signed-off-by: Yoann Congal <yoann.congal@smile.fr>
Signed-off-by: Harish Sadineni <Harish.Sadineni@windriver.com>
---
 meta/classes-recipe/kernel-yocto.bbclass | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/meta/classes-recipe/kernel-yocto.bbclass b/meta/classes-recipe/kernel-yocto.bbclass
index cd5daaf33b..bfdafbee8c 100644
--- a/meta/classes-recipe/kernel-yocto.bbclass
+++ b/meta/classes-recipe/kernel-yocto.bbclass
@@ -34,6 +34,11 @@ RUST_DEBUG_REMAP = "${@bb.utils.contains('DISTRO_FEATURES', 'rust-kernel', '--re
 KRUSTFLAGS:append = " ${RUST_DEBUG_REMAP}"
 EXTRA_OEMAKE:append = " ${@bb.utils.contains('DISTRO_FEATURES', 'rust-kernel', ' KRUSTFLAGS="${KRUSTFLAGS}"', '',d)}"
 
+# TODO: rust-kernel enabled kernel fails to build with:
+#  | error: multiple input filenames provided (first two filenames are gcc and .../tmp/work-shared/qemux86-64/kernel-source/scripts/generate_rust_target.rs)
+# Disable ccache for kernel build if rust-kernel is enabled to workaround this.
+CCACHE_DISABLE ?= "${@bb.utils.contains('DISTRO_FEATURES', 'rust-kernel', '1', '0', d)}"
+
 # returns local (absolute) path names for all valid patches in the
 # src_uri
 def find_patches(d,subdir):
-- 
2.49.0