Jacob Garber has uploaded this change for review.
coreinfo: Add support for link time optimization
This introduces a Kconfig option for compiling coreinfo with LTO.
This option can be used independently of LTO in libpayload, though will
benefit most if that is enabled as well. If both are enabled, the
final size of coreinfo.elf is reduced from 125K to 122K.
Change-Id: I6feacdb911b52b946869bff369e03dcf72897c9f
Signed-off-by: Jacob Garber <jgarber1@ualberta.ca>
---
M payloads/coreinfo/Kconfig
M payloads/coreinfo/Makefile
2 files changed, 12 insertions(+), 1 deletion(-)
git pull ssh://review.coreboot.org:29418/coreboot refs/changes/93/38293/1
diff --git a/payloads/coreinfo/Kconfig b/payloads/coreinfo/Kconfig
index fd4c1b4..5fb17bb 100644
--- a/payloads/coreinfo/Kconfig
+++ b/payloads/coreinfo/Kconfig
@@ -56,6 +56,13 @@
help
The version number of this payload.
+config LTO
+ bool "Use link time optimization"
+ default n
+ help
+ Compile with link time optimization. This can often decrease the
+ final binary size, but may increase compilation time.
+
endmenu
menu "Modules"
diff --git a/payloads/coreinfo/Makefile b/payloads/coreinfo/Makefile
index 34c45d9..6452c00 100644
--- a/payloads/coreinfo/Makefile
+++ b/payloads/coreinfo/Makefile
@@ -90,9 +90,13 @@
include $(src)/.config
real-all: $(TARGET)
+ifeq ($(CONFIG_LTO),y)
+CFLAGS += -flto=$(CPUS) -fuse-linker-plugin -fno-fat-lto-objects
+endif
+
$(TARGET): $(src)/.config $(coreinfo_obj)/config.h $(OBJS) libpayload
printf " LPCC $(subst $(CURDIR)/,,$(@)) (LINK)\n"
- $(LPCC) -o $@ $(OBJS)
+ $(LPCC) $(CFLAGS) -o $@ $(OBJS)
$(OBJCOPY) --only-keep-debug $@ $(TARGET).debug
$(OBJCOPY) --strip-debug $@
$(OBJCOPY) --add-gnu-debuglink=$(TARGET).debug $@
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