ar71xx: lzma loader use LTO
authorJulien Dusser <julien.dusser@free.fr>
Wed, 19 Jul 2017 13:45:08 +0000 (15:45 +0200)
committerFelix Fietkau <nbd@nbd.name>
Tue, 24 Oct 2017 11:24:04 +0000 (13:24 +0200)
Change the Makefile to use LTO for better code optimisations. Gains are
very low, only 270 bytes saved, but it's only Makefile changes.

Signed-off-by: Julien Dusser <julien.dusser@free.fr>
target/linux/ar71xx/image/lzma-loader/src/Makefile

index 5f10bdb..682b31f 100644 (file)
@@ -37,11 +37,13 @@ CFLAGS              = -D__KERNEL__ -Wall -Wstrict-prototypes -Wno-trigraphs -Os \
                  -mabi=32 -march=mips32r2 \
                  -Wa,-32 -Wa,-march=mips32r2 -Wa,-mips32r2 -Wa,--trap
 CFLAGS         += -D_LZMA_PROB32
+CFLAGS         += -flto
 
 ASFLAGS                = $(CFLAGS) -D__ASSEMBLY__
 
-LDFLAGS                = -static --gc-sections -no-warn-mismatch
-LDFLAGS                += -e startup -T loader.lds -Ttext $(LZMA_TEXT_START)
+LDFLAGS                = -static -Wl,--gc-sections -Wl,-no-warn-mismatch
+LDFLAGS                += -Wl,-e,startup -T loader.lds -Wl,-Ttext,$(LZMA_TEXT_START)
+LDFLAGS                += -flto -fwhole-program
 
 O_FORMAT       = $(shell $(OBJDUMP) -i | head -2 | grep elf32)
 
@@ -86,7 +88,7 @@ data.o: $(LOADER_DATA)
        $(LD) -r -b binary --oformat $(O_FORMAT) -T lzma-data.lds -o $@ $<
 
 loader: $(OBJECTS)
-       $(LD) $(LDFLAGS) -o $@ $(OBJECTS)
+       $(CC) $(CFLAGS) $(LDFLAGS) -o $@ $(OBJECTS)
 
 loader.bin: loader
        $(OBJCOPY) $(BIN_FLAGS) $< $@