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15d5761ad3
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 $(CC_FLAGS_FTRACE)
from all objects in the directory, then adds it back to
trace_selftest_dynamic.o and CFLAGS_trace_kprobe_selftest.o
The same applies to lib/livepatch/Makefile.
Please note ccflags-remove-y has no effect to the sub-directories.
In contrast, the previous notation got rid of compiler flags also from
all the sub-directories.
The following are not affected because they have no sub-directories:
arch/arm/boot/compressed/
arch/powerpc/xmon/
arch/sh/
kernel/trace/
However, lib/ has several sub-directories.
To keep the behavior, I added ccflags-remove-y to all Makefiles
in subdirectories of lib/, except the following:
lib/vdso/Makefile - Kbuild does not descend into this Makefile
lib/raid/test/Makefile - This is not used for the kernel build
I think commit 2464a609ded0 ("ftrace: do not trace library functions")
excluded too much. In the next commit, I will remove ccflags-remove-y
from the sub-directories of lib/.
Suggested-by: Sami Tolvanen <samitolvanen@google.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Acked-by: Brendan Higgins <brendanhiggins@google.com> (KUnit)
Tested-by: Anders Roxell <anders.roxell@linaro.org>
26 lines
662 B
Makefile
26 lines
662 B
Makefile
# SPDX-License-Identifier: GPL-2.0
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# Makefile for xmon
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GCOV_PROFILE := n
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KCOV_INSTRUMENT := n
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UBSAN_SANITIZE := n
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KASAN_SANITIZE := n
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# Disable ftrace for the entire directory
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ccflags-remove-$(CONFIG_FUNCTION_TRACER) += $(CC_FLAGS_FTRACE)
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ifdef CONFIG_CC_IS_CLANG
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# clang stores addresses on the stack causing the frame size to blow
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# out. See https://github.com/ClangBuiltLinux/linux/issues/252
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KBUILD_CFLAGS += -Wframe-larger-than=4096
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endif
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ccflags-$(CONFIG_PPC64) := $(NO_MINIMAL_TOC)
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obj-y += xmon.o nonstdio.o spr_access.o xmon_bpts.o
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ifdef CONFIG_XMON_DISASSEMBLY
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obj-y += ppc-dis.o ppc-opc.o
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obj-$(CONFIG_SPU_BASE) += spu-dis.o spu-opc.o
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endif
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