Difuse/u-boot
2
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

Make linking against libgcc configurable

Browse source 
Many (especially ARM) tool chains seem to come with broken or
otherwise unusable (for the purposes of builing U-Boot) run-time
support libraries `libgcc.a'. By using the "USE_PRIVATE_LIBGCC"
setting we allow to use alternative libraries instead.

"USE_PRIVATE_LIBGCC" can either be set as an environment variable in
the shell, or as a command line argument when running "make", i. e.
	$ make USE_PRIVATE_LIBGCC=yes
or
	$ USE_PRIVATE_LIBGCC=yes
	$ export USE_PRIVATE_LIBGCC
	$ make

The value of "USE_PRIVATE_LIBGCC" is the name of the directory which
contains the alternative run-time support library `libgcc.a'. The
special value "yes" selects the directory $(OBJTREE)/lib_$(ARCH) .

Note that not all architectures provide an alternative `libgcc.a' in
their lib_$(ARCH) directories - so far, only ARM does.

Signed-off-by: Wolfgang Denk <wd@denx.de>
Cc: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Cc: Prafulla Wadaskar <prafulla@marvell.com>
cc: Stefan Roese <sr@denx.de>
This commit is contained in:
Wolfgang Denk 2009-07-23 13:15:59 +02:00
parent 479105065d
commit 52b1bf2c5c
3 changed files with 34 additions and 12 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

12
Makefile
View file

@ -254,7 +254,17 @@ LIBBOARD = board/$(BOARDDIR)/lib$(BOARD).a
LIBBOARD := $(addprefix $(obj),$(LIBBOARD))
# Add GCC lib
PLATFORM_LIBS += -L $(shell dirname `$(CC) $(CFLAGS) -print-libgcc-file-name`) -lgcc
ifdef USE_PRIVATE_LIBGCC
ifeq ("$(USE_PRIVATE_LIBGCC)", "yes")
PLATFORM_LIBGCC = -L $(OBJTREE)/lib_$(ARCH) -lgcc
else
PLATFORM_LIBGCC = -L $(USE_PRIVATE_LIBGCC) -lgcc
endif
else
PLATFORM_LIBGCC = -L $(shell dirname `$(CC) $(CFLAGS) -print-libgcc-file-name`) -lgcc
endif
PLATFORM_LIBS += $(PLATFORM_LIBGCC)
export PLATFORM_LIBS
ifeq ($(CONFIG_NAND_U_BOOT),y)
NAND_SPL = nand_spl

4
board/trab/Makefile
View file

@ -36,8 +36,6 @@ SOBJS := $(addprefix $(obj),$(SOBJS))
OBJS_FKT := $(addprefix $(obj),$(COBJS_FKT))
gcclibdir := $(shell dirname `$(CC) -print-libgcc-file-name`)
LOAD_ADDR = 0xc100000
#########################################################################
@ -52,7 +50,7 @@ $(obj)trab_fkt.srec: $(OBJS_FKT) $(LIB)
-L$(obj)../../examples/standalone -lstubs \
-L$(obj)../../lib_generic -lgeneric \
$(obj)../../lib_arm/div0.o \
$(obj)../../lib_arm/_*.o
$(PLATFORM_LIBS)
$(OBJCOPY) -O srec $(<:.o=) $@
$(obj)trab_fkt.bin: $(obj)trab_fkt.srec

30
lib_arm/Makefile
View file

@ -24,13 +24,16 @@
include $(TOPDIR)/config.mk
LIB = $(obj)lib$(ARCH).a
LIBGCC = $(obj)libgcc.a
SOBJS-y += _ashldi3.o
SOBJS-y += _ashrdi3.o
SOBJS-y += _divsi3.o
SOBJS-y += _modsi3.o
SOBJS-y += _udivsi3.o
SOBJS-y += _umodsi3.o
GLSOBJS += _ashldi3.o
GLSOBJS += _ashrdi3.o
GLSOBJS += _divsi3.o
GLSOBJS += _modsi3.o
GLSOBJS += _udivsi3.o
GLSOBJS += _umodsi3.o
GLCOBJS += div0.o
COBJS-y += board.o
COBJS-y += bootm.o
@ -38,16 +41,27 @@ COBJS-y += cache.o
ifndef CONFIG_SYS_NO_CP15_CACHE
COBJS-y += cache-cp15.o
endif
COBJS-y += div0.o
COBJS-y += interrupts.o
COBJS-y += reset.o
SRCS := $(SOBJS-y:.o=.S) $(COBJS-y:.o=.c)
SRCS := $(GLSOBJS:.o=.S) $(GLCOBJS:.o=.c) \
$(SOBJS-y:.o=.S) $(COBJS-y:.o=.c)
OBJS := $(addprefix $(obj),$(SOBJS-y) $(COBJS-y))
LGOBJS := $(addprefix $(obj),$(GLSOBJS)) \
$(addprefix $(obj),$(GLCOBJS))
ifdef USE_PRIVATE_LIBGCC
all: $(LIB) $(LIBGCC)
else
all: $(LIB)
endif
$(LIB): $(obj).depend $(OBJS)
$(AR) $(ARFLAGS) $@ $(OBJS)
$(LIBGCC): $(obj).depend $(LGOBJS)
$(AR) $(ARFLAGS) $@ $(LGOBJS)
#########################################################################
# defines $(obj).depend target