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>
diff --git a/lib_arm/Makefile b/lib_arm/Makefile
index 4469361..241782c 100644
--- a/lib_arm/Makefile
+++ b/lib_arm/Makefile
@@ -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 @@
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