Paul Burton 16fd20aa98 kbuild: Disable LD_DEAD_CODE_DATA_ELIMINATION with ftrace & GCC <= 4.7 ... When building using GCC 4.7 or older, -ffunction-sections & the -pg flag used by ftrace are incompatible. This causes warnings or build failures (where -Werror applies) such as the following: arch/mips/generic/init.c: error: -ffunction-sections disabled; it makes profiling impossible This used to be taken into account by the ordering of calls to cc-option from within the top-level Makefile, which was introduced by commit 90ad4052e8 ("kbuild: avoid conflict between -ffunction-sections and -pg on gcc-4.7"). Unfortunately this was broken when the CONFIG_LD_DEAD_CODE_DATA_ELIMINATION cc-option check was moved to Kconfig in commit e85d1d65cd ("kbuild: test dead code/data elimination support in Kconfig"), because the flags used by this check no longer include -pg. Fix this by not allowing CONFIG_LD_DEAD_CODE_DATA_ELIMINATION to be enabled at the same time as ftrace/CONFIG_FUNCTION_TRACER when building using GCC 4.7 or older. Signed-off-by: Paul Burton <paul.burton@mips.com> Fixes: e85d1d65cd ("kbuild: test dead code/data elimination support in Kconfig") Reported-by: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: stable@vger.kernel.org # v4.19+ Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>		2019-01-14 10:37:09 +09:00
..
calibrate.c
do_mounts.c
do_mounts.h
do_mounts_initrd.c
do_mounts_md.c
do_mounts_rd.c
init_task.c
initramfs.c
Kconfig	kbuild: Disable LD_DEAD_CODE_DATA_ELIMINATION with ftrace & GCC <= 4.7	2019-01-14 10:37:09 +09:00
main.c
Makefile
noinitramfs.c
version.c