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build: Disable gcc's use-linker-plugin option 

On GCC v6 the -fwhole-program option does not take effect when
-fuse-linker-plugin is also in effect. The -fuse-linker-plugin option
does not optimize as well as -fwhole-program, so explicitly disable
the linker plugin via -fno-use-linker-plugin.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2016-12-22 22:48:14 -05:00
parent 9894348e12
commit 4e8674d5df
1 changed files with 2 additions and 2 deletions
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4
Makefile
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@ -35,9 +35,9 @@ cc-option=$(shell if test -z "`$(1) $(2) -S -o /dev/null -xc /dev/null 2>&1`" \
CFLAGS-y := -I$(OUT) -Isrc -I$(OUT)board-generic/ -O2 -MD -g \ CFLAGS-y := -I$(OUT) -Isrc -I$(OUT)board-generic/ -O2 -MD -g \
-Wall -Wold-style-definition $(call cc-option,$(CC),-Wtype-limits,) \ -Wall -Wold-style-definition $(call cc-option,$(CC),-Wtype-limits,) \
-ffunction-sections -fdata-sections -ffunction-sections -fdata-sections
CFLAGS-y += -flto -fwhole-program CFLAGS-y += -flto -fwhole-program -fno-use-linker-plugin
LDFLAGS-y := -Wl,--gc-sections LDFLAGS-y := -Wl,--gc-sections -fno-whole-program
CPPFLAGS = -I$(OUT) -P -MD -MT $@ CPPFLAGS = -I$(OUT) -P -MD -MT $@