diff options
| author | Jacob Garber <jgarber1@ualberta.ca> | 2019-10-02 18:55:23 -0600 |
|---|---|---|
| committer | Stefan Reinauer <stefan.reinauer@coreboot.org> | 2020-11-02 22:10:23 +0000 |
| commit | 5e6c30bc421757a11ec6f7c1f730bf36c7de1b57 (patch) | |
| tree | e27ae86da5d144cacfd2c95ad8576ac320183346 /payloads/coreinfo | |
| parent | 04540f1549a6fea5227ac9538edb8b2643c4d719 (diff) | |
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 95 KiB to 92 KiB.
Tested in QEMU and on Thinkpad T500.
Change-Id: I6feacdb911b52b946869bff369e03dcf72897c9f
Signed-off-by: Jacob Garber <jgarber1@ualberta.ca>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/38293
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>
Reviewed-by: Martin Roth <martinroth@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'payloads/coreinfo')
| -rw-r--r-- | payloads/coreinfo/Kconfig | 9 | ||||
| -rw-r--r-- | payloads/coreinfo/Makefile | 6 |
2 files changed, 14 insertions, 1 deletions
diff --git a/payloads/coreinfo/Kconfig b/payloads/coreinfo/Kconfig index eafb879363..2c1f91c874 100644 --- a/payloads/coreinfo/Kconfig +++ b/payloads/coreinfo/Kconfig @@ -42,6 +42,15 @@ config PAYLOAD_INFO_VERSION help The version number of this payload. +config LTO + bool "Use link time optimization (LTO)" + default n + help + Compile with link time optimization. This can often decrease the + final binary size, but may increase compilation time. This option + is most effective when LTO is also enabled in libpayload, which + is done separately. + endmenu menu "Modules" diff --git a/payloads/coreinfo/Makefile b/payloads/coreinfo/Makefile index d842b469c4..cd58f392dd 100644 --- a/payloads/coreinfo/Makefile +++ b/payloads/coreinfo/Makefile @@ -76,9 +76,13 @@ ifneq ($(strip $(HAVE_DOTCONFIG)),) include $(src)/.config real-all: $(TARGET) +ifeq ($(CONFIG_LTO),y) +CFLAGS += -flto +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 $@ |