kernel.bbclass: remove unnecessary dead code

The grep pattern seems to have been wrong ever since we stopped adding
the -ffile-prefix-map via a patch in commit 20aea61385e, because the
actual upstream gcc produces

  -ffile-prefix-map=<old>=<new>

and not

  -ffile-prefix-map=<old=new>

Besides, these *-prefix-map options are already used when building the
kernel due to the setting of KERNEL_CC, and the kernel build system
itself also probes for and uses at least -fmacro-prefix-map (hence
taking care of __FILE__ etc., but not necessarily things that go in
.debug_info sections).

(From OE-Core rev: 5d56de8cd653d2a3a7f4c104d50c14e22d412f66)

Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 2 insertions, 13 deletions

diff --git a/meta/classes/kernel.bbclass b/meta/classes/kernel.bbclass
index d13c38fb02..4acec1877e 100644
--- a/meta/classes/kernel.bbclass
+++ b/meta/classes/kernel.bbclass
@@ -322,15 +322,6 @@ python do_devshell:prepend () {
 
 addtask bundle_initramfs after do_install before do_deploy
 
-get_cc_option () {
-                # Check if KERNEL_CC supports the option "file-prefix-map".
-                # This option allows us to build images with __FILE__ values that do not
-                # contain the host build path.
-                if ${KERNEL_CC} -Q --help=joined | grep -q "\-ffile-prefix-map=<old=new>"; then
-                        echo "-ffile-prefix-map=${S}=/kernel-source/"
-                fi
-}
-
 kernel_do_compile() {
         unset CFLAGS CPPFLAGS CXXFLAGS LDFLAGS MACHINE
         if [ "${BUILD_REPRODUCIBLE_BINARIES}" = "1" ]; then
@@ -361,9 +352,8 @@ kernel_do_compile() {
                 copy_initramfs
                 use_alternate_initrd=CONFIG_INITRAMFS_SOURCE=${B}/usr/${INITRAMFS_IMAGE_NAME}.cpio
         fi
-        cc_extra=$(get_cc_option)
         for typeformake in ${KERNEL_IMAGETYPE_FOR_MAKE} ; do
-                oe_runmake ${typeformake} CC="${KERNEL_CC} $cc_extra " LD="${KERNEL_LD}" ${KERNEL_EXTRA_ARGS} $use_alternate_initrd
+                oe_runmake ${typeformake} CC="${KERNEL_CC}" LD="${KERNEL_LD}" ${KERNEL_EXTRA_ARGS} $use_alternate_initrd
         done
         # vmlinux.gz is not built by kernel
         if (echo "${KERNEL_IMAGETYPES}" | grep -wq "vmlinux\.gz"); then
@@ -390,8 +380,7 @@ do_compile_kernelmodules() {
                 bbnote "KBUILD_BUILD_TIMESTAMP: $ts"
         fi
         if (grep -q -i -e '^CONFIG_MODULES=y$' ${B}/.config); then
-                cc_extra=$(get_cc_option)
-                oe_runmake -C ${B} ${PARALLEL_MAKE} modules CC="${KERNEL_CC} $cc_extra " LD="${KERNEL_LD}" ${KERNEL_EXTRA_ARGS}
+                oe_runmake -C ${B} ${PARALLEL_MAKE} modules CC="${KERNEL_CC}" LD="${KERNEL_LD}" ${KERNEL_EXTRA_ARGS}
 
                 # Module.symvers gets updated during the 
                 # building of the kernel modules. We need to