Changeset cf84f1bf in mainline for kernel/Makefile

Timestamp:

2010-05-26T15:36:03Z (14 years ago)

Author:

Martin Decky <martin@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

3c664d6

Parents:

938f227

Message:

add kernel support for link-time optimization (GCC 4.5+)

File:

• kernel/Makefile (modified) (9 diffs)

kernel/Makefile

@@ -118 +118 @@
 endif
 
+ifeq ($(CONFIG_LTO),y)
+        GCC_CFLAGS += -flto
+endif
+
 -include arch/$(KARCH)/Makefile.inc
 -include genarch/Makefile.inc
@@ -167 +171 @@
         DEPEND_DEFS = $(DEFS) $(CONFIG_DEFS)
 endif
+
+AFLAGS =
+LFLAGS = -N -T $(LINK) -M
 
 ## Generic kernel sources
@@ -348 +355 @@
 GENARCH_OBJECTS := $(addsuffix .o,$(basename $(GENARCH_SOURCES)))
 
+LFLAGS_LTO := $(addprefix -Xlinker ,$(LFLAGS))
+
 ifeq ($(CONFIG_SYMTAB),y)
         SYMTAB_OBJECTS := generic/src/debug/real_map.o
@@ -361 +370 @@
 
 $(RAW): $(LINK) $(ARCH_OBJECTS) $(GENARCH_OBJECTS) $(GENERIC_OBJECTS) $(SYMTAB_OBJECTS)
-        $(LD) -N $(LFLAGS) -T $(LINK) -M -Map $(MAP) -o $@ $(ARCH_OBJECTS) $(GENARCH_OBJECTS) $(GENERIC_OBJECTS) $(EXTRA_OBJECTS) $(SYMTAB_OBJECTS)
+ifeq ($(CONFIG_LTO),y)
+        $(GCC) $(LFLAGS_LTO) -Xlinker -Map -Xlinker $(MAP) $(DEFS) $(GCC_CFLAGS) -o $@ $(ARCH_OBJECTS) $(GENARCH_OBJECTS) $(GENERIC_OBJECTS) $(EXTRA_OBJECTS) $(SYMTAB_OBJECTS)
+else
+        $(LD) $(LFLAGS) -Map $(MAP) -o $@ $(ARCH_OBJECTS) $(GENARCH_OBJECTS) $(GENERIC_OBJECTS) $(EXTRA_OBJECTS) $(SYMTAB_OBJECTS)
+endif
 ifeq ($(CONFIG_STRIP_BINARIES),y)
-        $(STRIP) $(RAW) 
+        $(STRIP) $(RAW)
 endif
 
@@ -370 +383 @@
 
 %.o: %.S $(DEPEND)
-        $(GCC) $(DEFS) $(GCC_CFLAGS) -D__ASM__ -c $< -o $@
+        $(GCC) $(DEFS) $(GCC_CFLAGS) -D__ASM__ -c -o $@ $<
 ifeq ($(PRECHECK),y)
         $(JOBFILE) $(JOB) $< $@ as asm/preproc $(DEFS) $(GCC_CFLAGS) -D__ASM__
@@ -387 +400 @@
 
 test/fpu/%.o: test/fpu/%.c $(DEPEND)
-        $(CC) $(DEFS) $(CFLAGS) $(EXTRA_FLAGS) -c $< -o $@
+        $(CC) $(DEFS) $(CFLAGS) $(EXTRA_FLAGS) -c -o $@ $<
 ifeq ($(PRECHECK),y)
         $(JOBFILE) $(JOB) $< $@ cc test $(DEFS) $(CFLAGS) $(EXTRA_FLAGS)
@@ -397 +410 @@
 
 %.o: %.c $(DEPEND)
-        $(CC) $(DEFS) $(CFLAGS) $(EXTRA_FLAGS) $(FPU_NO_CFLAGS) -c $< -o $@
+        $(CC) $(DEFS) $(CFLAGS) $(EXTRA_FLAGS) $(FPU_NO_CFLAGS) -c -o $@ $<
 ifeq ($(PRECHECK),y)
         $(JOBFILE) $(JOB) $< $@ cc core $(DEFS) $(CFLAGS) $(EXTRA_FLAGS) $(FPU_NO_CFLAGS)
@@ -407 +420 @@
 $(REAL_MAP).bin: $(LINK) $(ARCH_OBJECTS) $(GENARCH_OBJECTS) $(GENERIC_OBJECTS)
         echo $(SYMTAB_SECTION) | $(AS) $(AFLAGS) -o $(EMPTY_MAP)
-        $(LD) -N $(LFLAGS) -T $(LINK) -M -Map $(MAP_PREV) -o $@ $(ARCH_OBJECTS) $(GENARCH_OBJECTS) $(GENERIC_OBJECTS) $(EXTRA_OBJECTS) $(EMPTY_MAP)
+ifeq ($(CONFIG_LTO),y)
+        $(GCC) $(LFLAGS_LTO) -Xlinker -Map -Xlinker $(MAP_PREV) $(DEFS) $(GCC_CFLAGS) -o $@ $(ARCH_OBJECTS) $(GENARCH_OBJECTS) $(GENERIC_OBJECTS) $(EXTRA_OBJECTS) $(EMPTY_MAP)
+else
+        $(LD) $(LFLAGS) -Map $(MAP_PREV) -o $@ $(ARCH_OBJECTS) $(GENARCH_OBJECTS) $(GENERIC_OBJECTS) $(EXTRA_OBJECTS) $(EMPTY_MAP)
+endif
         $(OBJDUMP) -t $(ARCH_OBJECTS) $(GENARCH_OBJECTS) $(GENERIC_OBJECTS) > $(DUMP)
         $(GENMAP) $(MAP_PREV) $(DUMP) $@
@@ -415 +432 @@
         
         echo $(SYMTAB_SECTION)" .incbin \"$@\"" | $(AS) $(AFLAGS) -o $(SIZEOK_MAP)
-        $(LD) -N $(LFLAGS) -T $(LINK) -M -Map $(MAP_PREV) -o $@ $(ARCH_OBJECTS) $(GENARCH_OBJECTS) $(GENERIC_OBJECTS) $(EXTRA_OBJECTS) $(SIZEOK_MAP)
+ifeq ($(CONFIG_LTO),y)
+        $(GCC) $(LFLAGS_LTO) -Xlinker -Map -Xlinker $(MAP_PREV) $(DEFS) $(GCC_CFLAGS) -o $@ $(ARCH_OBJECTS) $(GENARCH_OBJECTS) $(GENERIC_OBJECTS) $(EXTRA_OBJECTS) $(SIZEOK_MAP)
+else
+        $(LD) $(LFLAGS) -Map $(MAP_PREV) -o $@ $(ARCH_OBJECTS) $(GENARCH_OBJECTS) $(GENERIC_OBJECTS) $(EXTRA_OBJECTS) $(SIZEOK_MAP)
+endif
         $(OBJDUMP) -t $(ARCH_OBJECTS) $(GENARCH_OBJECTS) $(GENERIC_OBJECTS) > $(DUMP)
         $(GENMAP) $(MAP_PREV) $(DUMP) $@