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Make linking against libgcc configurable 

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