Masahiro Yamada 15d5761ad3 kbuild: introduce ccflags-remove-y and asflags-remove-y ... CFLAGS_REMOVE_<file>.o filters out flags when compiling a particular object, but there is no convenient way to do that for every object in a directory. Add ccflags-remove-y and asflags-remove-y to make it easily. Use ccflags-remove-y to clean up some Makefiles. The add/remove order works as follows: [1] KBUILD_CFLAGS specifies compiler flags used globally [2] ccflags-y adds compiler flags for all objects in the current Makefile [3] ccflags-remove-y removes compiler flags for all objects in the current Makefile (New feature) [4] CFLAGS_<file> adds compiler flags per file. [5] CFLAGS_REMOVE_<file> removes compiler flags per file. Having [3] before [4] allows us to remove flags from most (but not all) objects in the current Makefile. For example, kernel/trace/Makefile removes $(CC_FLAGS_FTRACE) from all objects in the directory, then adds it back to trace_selftest_dynamic.o and CFLAGS_trace_kprobe_selftest.o The same applies to lib/livepatch/Makefile. Please note ccflags-remove-y has no effect to the sub-directories. In contrast, the previous notation got rid of compiler flags also from all the sub-directories. The following are not affected because they have no sub-directories: arch/arm/boot/compressed/ arch/powerpc/xmon/ arch/sh/ kernel/trace/ However, lib/ has several sub-directories. To keep the behavior, I added ccflags-remove-y to all Makefiles in subdirectories of lib/, except the following: lib/vdso/Makefile - Kbuild does not descend into this Makefile lib/raid/test/Makefile - This is not used for the kernel build I think commit 2464a609de ("ftrace: do not trace library functions") excluded too much. In the next commit, I will remove ccflags-remove-y from the sub-directories of lib/. Suggested-by: Sami Tolvanen <samitolvanen@google.com> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc) Acked-by: Brendan Higgins <brendanhiggins@google.com> (KUnit) Tested-by: Anders Roxell <anders.roxell@linaro.org>		2020-08-10 01:32:59 +09:00
..
bitstream.h	lib: zstd: Mark expected switch fall-throughs	2019-04-08 18:39:18 -05:00
compress.c	lib: zstd: Mark expected switch fall-throughs	2019-04-08 18:39:18 -05:00
decompress.c	lib: zstd: Mark expected switch fall-throughs	2019-04-08 18:39:18 -05:00
entropy_common.c
error_private.h
fse_compress.c
fse_decompress.c
fse.h
huf_compress.c	lib: zstd: Mark expected switch fall-throughs	2019-04-08 18:39:18 -05:00
huf_decompress.c
huf.h
Makefile	kbuild: introduce ccflags-remove-y and asflags-remove-y	2020-08-10 01:32:59 +09:00
mem.h	lib/zstd/mem.h: replace __inline by inline	2019-09-15 19:42:16 +02:00
zstd_common.c
zstd_internal.h
zstd_opt.h