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software: enable link time optimization (LTO)
authorTim 'mithro' Ansell <me@mith.ro>
Tue, 27 Nov 2018 08:48:44 +0000 (00:48 -0800)
committerPawel Czarnecki <pczarnecki@internships.antmicro.com>
Mon, 24 Feb 2020 15:12:21 +0000 (16:12 +0100)
Co-authored-by: Pawel Czarnecki <pczarnecki@internships.antmicro.com>
litex/soc/software/bios/Makefile patch | blob | history
litex/soc/software/common.mak patch | blob | history

diff --git a/litex/soc/software/bios/Makefile b/litex/soc/software/bios/Makefile
index 66be372c70c21ef37562d1587155ccb9226046eb..6966ff973338409aa6aac105501fe315957e9311 100755 (executable)
--- a/litex/soc/software/bios/Makefile
+++ b/litex/soc/software/bios/Makefile
@@ -29,7 +29,7 @@ bios.elf: $(BIOS_DIRECTORY)/linker.ld $(OBJECTS)
 
 
 %.elf: ../libbase/crt0-$(CPU)-ctr.o ../libnet/libnet.a ../libbase/libbase-nofloat.a ../libcompiler_rt/libcompiler_rt.a
-       $(LD) $(LDFLAGS) -T $(BIOS_DIRECTORY)/linker.ld -N -o $@ \
+       $(CC) $(LDFLAGS) -T $(BIOS_DIRECTORY)/linker.ld -N -o $@ \
                ../libbase/crt0-$(CPU)-ctr.o \
                $(OBJECTS) \
                -L../libnet \
diff --git a/litex/soc/software/common.mak b/litex/soc/software/common.mak
index 18fc50c3f299e751a0dc538477c8a7327186b858..259ff4734cbd570ad320d574f6be25ee81348adf 100644 (file)
--- a/litex/soc/software/common.mak
+++ b/litex/soc/software/common.mak
@@ -14,7 +14,7 @@ else
 CC_normal      := $(TARGET_PREFIX)gcc -std=gnu99
 CX_normal      := $(TARGET_PREFIX)g++
 endif
-AR_normal      := $(TARGET_PREFIX)ar
+AR_normal      := $(TARGET_PREFIX)gcc-ar
 LD_normal      := $(TARGET_PREFIX)ld
 OBJCOPY_normal := $(TARGET_PREFIX)objcopy
 
@@ -46,10 +46,10 @@ DEPFLAGS += -MD -MP
 # Toolchain options
 #
 INCLUDES = -I$(SOC_DIRECTORY)/software/include/base -I$(SOC_DIRECTORY)/software/include -I$(SOC_DIRECTORY)/common -I$(BUILDINC_DIRECTORY)
-COMMONFLAGS = $(DEPFLAGS) -Os $(CPUFLAGS) -g3 -fomit-frame-pointer -Wall -fno-builtin -nostdinc $(INCLUDES)
+COMMONFLAGS = $(DEPFLAGS) -Os $(CPUFLAGS) -g3 -fomit-frame-pointer -Wall -fno-builtin -nostdinc $(INCLUDES) -flto -fuse-linker-plugin -ffunction-sections -fdata-sections -nostartfiles -nostdlib -nodefaultlibs
 CFLAGS = $(COMMONFLAGS) -fexceptions -Wstrict-prototypes -Wold-style-definition -Wmissing-prototypes
 CXXFLAGS = $(COMMONFLAGS) -std=c++11 -I$(SOC_DIRECTORY)/software/include/basec++ -fexceptions -fno-rtti -ffreestanding
-LDFLAGS = -nostdlib -nodefaultlibs -L$(BUILDINC_DIRECTORY)
+LDFLAGS = -nostdlib -nodefaultlibs -Os $(CPUFLAGS) -L$(BUILDINC_DIRECTORY)
 
 define compilexx
 $(CX) -c $(CXXFLAGS) $(1) $< -o $@