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Subject[PATCH 3/3] kbuild: remove ARCH_{CPP,A,C}FLAGS
These flags were added by commit 61754c18752f ("kbuild: Allow arch
Makefiles to override {cpp,ld,c}flags") to allow ARC to override -O2.

We did not see any other usage after all. Now that ARC switched to
CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3, there is no more user of
these variables.

Signed-off-by: Masahiro Yamada <>

Documentation/kbuild/makefiles.rst | 7 -------
Makefile | 14 ++++----------
2 files changed, 4 insertions(+), 17 deletions(-)

diff --git a/Documentation/kbuild/makefiles.rst b/Documentation/kbuild/makefiles.rst
index 36ba92e199d2..712cdbcdbe91 100644
--- a/Documentation/kbuild/makefiles.rst
+++ b/Documentation/kbuild/makefiles.rst
@@ -988,13 +988,6 @@ When kbuild executes, the following steps are followed (roughly):
$(KBUILD_ARFLAGS) set by the top level Makefile to "D" (deterministic
mode) if this option is supported by $(AR).

- ARCH_CPPFLAGS, ARCH_AFLAGS, ARCH_CFLAGS Overrides the kbuild defaults
- These variables are appended to the KBUILD_CPPFLAGS,
- KBUILD_AFLAGS, and KBUILD_CFLAGS, respectively, after the
- top-level Makefile has set any other flags. This provides a
- means for an architecture to override the defaults.

The linker script with full path. Assigned by the top-level Makefile.
diff --git a/Makefile b/Makefile
index 891e47da503f..6551f136afb0 100644
--- a/Makefile
+++ b/Makefile
@@ -661,11 +661,6 @@ RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc

-# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
-# values of the respective KBUILD_* variables
include arch/$(SRCARCH)/Makefile

ifdef need-config
@@ -918,11 +913,10 @@ include scripts/Makefile.kasan
include scripts/Makefile.extrawarn
include scripts/Makefile.ubsan

-# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
-# last assignments
+# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments

LDFLAGS_vmlinux += --build-id
 \ /
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