examples: select libgcc for non-default architecture

In case of multilib-enabled toolchains if default architecture differ from
the one examples are being built for linker will fail to link example object
files with libgcc of another (non-compatible) architecture.

Interesting enough for years in main Makefile we used CFLAGS/c_flags for this
but not for examples.

So fixing it now.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>

Cc: Masahiro Yamada <yamada.m@jp.panasonic.com>
Cc: Tom Rini <trini@ti.com>
Cc: Wolfgang Denx <wd@denx.de>
Acked-by: WOlfgang Denk <wd@denx.de>
Acked-by: Masahiro Yamada <yamada.m@jp.panasonic.com>

Makefile

@@ -699,6 +699,7 @@ PLATFORM_LIBGCC := -L $(shell dirname `$(CC) $(c_flags) -print-libgcc-file-name`
 endif
 PLATFORM_LIBS += $(PLATFORM_LIBGCC)
 export PLATFORM_LIBS
+export PLATFORM_LIBGCC
 
 # Special flags for CPP when processing the linker script.
 # Pass the version down so we can handle backwards compatibility

examples/standalone/Makefile

@@ -38,8 +38,6 @@ targets += $(patsubst $(obj)/%,%,$(LIB)) $(COBJS) $(LIBOBJS-y)
 LIBOBJS	:= $(addprefix $(obj)/,$(LIBOBJS-y))
 ELF	:= $(addprefix $(obj)/,$(ELF))
 
-gcclibdir := $(shell dirname `$(CC) -print-libgcc-file-name`)
-
 # For PowerPC there's no need to compile standalone applications as a
 # relocatable executable.  The relocation data is not needed, and
 # also causes the entry point of the standalone application to be
@@ -63,7 +61,7 @@ $(LIB):	$(LIBOBJS) FORCE
 
 quiet_cmd_link_elf = LD      $@
       cmd_link_elf = $(LD) $(LDFLAGS) -g -Ttext $(CONFIG_STANDALONE_LOAD_ADDR) \
-		     -o $@ -e $(SYM_PREFIX)$(@F) $< $(LIB) -L$(gcclibdir) -lgcc
+		     -o $@ -e $(SYM_PREFIX)$(@F) $< $(LIB) $(PLATFORM_LIBGCC)
 
 $(ELF): $(obj)/%: $(obj)/%.o $(LIB) FORCE
 	$(call if_changed,link_elf)