bitbake.conf: Switch prefix mapping to use -ffile-prefix-map

-ffile-prefix map is more comprehensive when it comes to reproducible
builds and its superset of all prefix-mapping options in compilers

This makes is cleaner and workable across gcc and clang, clang does not
support -fcanon-prefix-map and it has to be explicitly omitted when using
clang.

There are lambdas generated in templates by clang which still get the
absolute paths despite -fdebug-prefix-map, this helps with that as well.

nasm is an outlier and we have fixed it by adding -fdebug-prefix-map option
luckily we do not pass DEBUG_PREFIX_MAP to nasm, in all recipes which use
nasm either pass -fdebug-prefix-map explicitly to nasm or they rewrite it
to use nasm flags syntax.

We have discussed this in past [1]

[1] https://patchwork.yoctoproject.org/project/oe-core/patch/20230428032030.2047920-1-raj.khem@gmail.com/#10281

(From OE-Core rev: ff73fa7ef7666a6dbe34f15515bc3ab6e574c5b0)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Cc: Jacob Kroon <jacob.kroon@gmail.com>
Cc: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 2 insertions, 4 deletions

diff --git a/meta/classes-recipe/kernel-arch.bbclass b/meta/classes-recipe/kernel-arch.bbclass
index 36a6e0a60a..749a266ea3 100644
--- a/meta/classes-recipe/kernel-arch.bbclass
+++ b/meta/classes-recipe/kernel-arch.bbclass
@@ -73,10 +73,8 @@ HOST_OBJCOPY_KERNEL_ARCH ?= "${TARGET_OBJCOPY_KERNEL_ARCH}"
 
 KERNEL_CC = "${CCACHE}${HOST_PREFIX}gcc ${HOST_CC_KERNEL_ARCH} \
  -fuse-ld=bfd ${DEBUG_PREFIX_MAP} \
- -fdebug-prefix-map=${STAGING_KERNEL_DIR}=${KERNEL_SRC_PATH} \
- -fmacro-prefix-map=${STAGING_KERNEL_DIR}=${KERNEL_SRC_PATH} \
- -fdebug-prefix-map=${STAGING_KERNEL_BUILDDIR}=${KERNEL_SRC_PATH} \
- -fmacro-prefix-map=${STAGING_KERNEL_BUILDDIR}=${KERNEL_SRC_PATH} \
+ -ffile-prefix-map=${STAGING_KERNEL_DIR}=${KERNEL_SRC_PATH} \
+ -ffile-prefix-map=${STAGING_KERNEL_BUILDDIR}=${KERNEL_SRC_PATH} \
 "
 KERNEL_LD = "${HOST_PREFIX}ld.bfd ${HOST_LD_KERNEL_ARCH}"
 KERNEL_AR = "${HOST_PREFIX}ar ${HOST_AR_KERNEL_ARCH}"