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xtensa: add config option to disable linker relaxation 

The default linker behavior is to optimize identical literal values and
remove unnecessary overhead from assembler-generated "longcall" sequences
to reduce code size. Provide an option to disable this behavior to improve
compile time.

Signed-off-by: Chris Zankel <chris@zankel.net>
This commit is contained in:
Chris Zankel 2012-11-13 15:16:36 -08:00
parent 02b25d811f
commit 6550162200
2 changed files with 15 additions and 2 deletions
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13
arch/xtensa/Kconfig.debug
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@ -2,6 +2,15 @@ menu "Kernel hacking"
source "lib/Kconfig.debug" source "lib/Kconfig.debug"
config LD_NO_RELAX
bool "Disable linker relaxation"
default n
help
Enable this function to disable link-time optimizations.
The default linker behavior is to combine identical literal
values to reduce code size and remove unnecessary overhead from
assembler-generated 'longcall' sequences.
Enabling this option improves the link time but increases the
code size, and possibly execution time.
endmenu endmenu

4
arch/xtensa/Makefile
View File

@ -49,6 +49,10 @@ KBUILD_CFLAGS += -pipe -mlongcalls
KBUILD_CFLAGS += $(call cc-option,-mforce-no-pic,) KBUILD_CFLAGS += $(call cc-option,-mforce-no-pic,)
ifneq ($(CONFIG_LD_NO_RELAX),)
LDFLAGS := --no-relax
endif
vardirs := $(patsubst %,arch/xtensa/variants/%/,$(variant-y)) vardirs := $(patsubst %,arch/xtensa/variants/%/,$(variant-y))
plfdirs := $(patsubst %,arch/xtensa/platforms/%/,$(platform-y)) plfdirs := $(patsubst %,arch/xtensa/platforms/%/,$(platform-y))