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kernel: support setting extra CFLAGS for kernel compilation

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They may be used e.g. to optimize kernel size or performance.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
(cherry picked from commit 907d7d747243044f86588f0d82993e8c106cb02c)
This commit is contained in:
Rafał Miłecki 2022-06-15 12:36:36 +02:00
parent 44fa330a82
commit b0968be02e
2 changed files with 5 additions and 1 deletions
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4
config/Config-devel.in
View File

@ -74,6 +74,10 @@ menuconfig DEVEL
Store ccache in this directory.
If not set, uses './.ccache'
config KERNEL_CFLAGS
string "Kernel extra CFLAGS" if DEVEL
default ""
config EXTERNAL_KERNEL_TREE
string "Use external kernel tree" if DEVEL
default ""

2
include/kernel.mk
View File

@ -101,7 +101,7 @@ endif
KERNEL_MAKE = $(MAKE) $(KERNEL_MAKEOPTS)
KERNEL_MAKE_FLAGS = \
KCFLAGS="$(call iremap,$(BUILD_DIR),$(notdir $(BUILD_DIR))) $(filter-out -fno-plt,$(call qstrip,$(CONFIG_EXTRA_OPTIMIZATION)))" \
KCFLAGS="$(call iremap,$(BUILD_DIR),$(notdir $(BUILD_DIR))) $(filter-out -fno-plt,$(call qstrip,$(CONFIG_EXTRA_OPTIMIZATION))) $(call qstrip,$(CONFIG_KERNEL_CFLAGS))" \
HOSTCFLAGS="$(HOST_CFLAGS) -Wall -Wmissing-prototypes -Wstrict-prototypes" \
CROSS_COMPILE="$(KERNEL_CROSS)" \
ARCH="$(LINUX_KARCH)" \