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https://github.com/brain-hackers/u-boot-brain
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c91d456c05
Using -fno-toplevel-reorder causes gcc to not reorder functions. This
ensures that an application's entry point will be the first function in
the application's source file.
This change, along with commit 620bbba524
should cause a standalone application's entry point to be at the base of
the compiled binary. Previously, the entry point could change depending
on gcc version and flags.
Note -fno-toplevel-reorder is only available in gcc version 4.2 or
greater.
Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
118 lines
3.6 KiB
Makefile
118 lines
3.6 KiB
Makefile
#
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# (C) Copyright 2000-2006
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# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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#
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# See file CREDITS for list of people who contributed to this
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# project.
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation; either version 2 of
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# the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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# MA 02111-1307 USA
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#
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include $(TOPDIR)/config.mk
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ELF-$(ARCH) :=
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ELF-$(BOARD) :=
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ELF-$(CPU) :=
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ELF-y := hello_world
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ELF-$(CONFIG_SMC91111) += smc91111_eeprom
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ELF-$(CONFIG_SMC911X) += smc911x_eeprom
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ELF-$(CONFIG_SPI_FLASH_ATMEL) += atmel_df_pow2
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ELF-i386 += 82559_eeprom
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ELF-mpc5xxx += interrupt
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ELF-mpc8xx += test_burst timer
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ELF-mpc8260 += mem_to_mem_idma2intr
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ELF-ppc += sched
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ELF-oxc += eepro100_eeprom
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#
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# Some versions of make do not handle trailing white spaces properly;
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# leading to build failures. The problem was found with GNU Make 3.80.
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# Using 'strip' as a workaround for the problem.
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#
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ELF := $(strip $(ELF-y) $(ELF-$(ARCH)) $(ELF-$(BOARD)) $(ELF-$(CPU)))
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SREC = $(addsuffix .srec,$(ELF))
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BIN = $(addsuffix .bin,$(ELF))
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COBJS := $(ELF:=.o)
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LIB = $(obj)libstubs.a
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LIBAOBJS-$(ARCH) :=
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LIBAOBJS-$(CPU) :=
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LIBAOBJS-ppc += $(ARCH)_longjmp.o $(ARCH)_setjmp.o
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LIBAOBJS-mpc8xx += test_burst_lib.o
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LIBAOBJS := $(LIBAOBJS-$(ARCH)) $(LIBAOBJS-$(CPU))
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LIBCOBJS = stubs.o
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LIBOBJS = $(addprefix $(obj),$(LIBAOBJS) $(LIBCOBJS))
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SRCS := $(COBJS:.o=.c) $(LIBCOBJS:.o=.c) $(LIBAOBJS:.o=.S)
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OBJS := $(addprefix $(obj),$(COBJS))
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ELF := $(addprefix $(obj),$(ELF))
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BIN := $(addprefix $(obj),$(BIN))
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SREC := $(addprefix $(obj),$(SREC))
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gcclibdir := $(shell dirname `$(CC) -print-libgcc-file-name`)
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CPPFLAGS += -I..
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# For PowerPC there's no need to compile standalone applications as a
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# relocatable executable. The relocation data is not needed, and
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# also causes the entry point of the standalone application to be
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# inconsistent.
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ifeq ($(ARCH),powerpc)
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AFLAGS := $(filter-out $(RELFLAGS),$(AFLAGS))
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CFLAGS := $(filter-out $(RELFLAGS),$(CFLAGS))
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CPPFLAGS := $(filter-out $(RELFLAGS),$(CPPFLAGS))
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endif
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# We don't want gcc reordering functions if possible. This ensures that an
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# application's entry point will be the first function in the application's
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# source file.
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CFLAGS += $(call cc-option,-fno-toplevel-reorder)
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all: $(obj).depend $(OBJS) $(LIB) $(SREC) $(BIN) $(ELF)
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#########################################################################
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$(LIB): $(obj).depend $(LIBOBJS)
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$(AR) $(ARFLAGS) $@ $(LIBOBJS)
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$(ELF):
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$(obj)%: $(obj)%.o $(LIB)
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$(LD) -g -Ttext $(STANDALONE_LOAD_ADDR) \
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-o $@ -e $(SYM_PREFIX)$(notdir $(<:.o=)) $< $(LIB) \
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-L$(gcclibdir) -lgcc
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$(SREC):
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$(obj)%.srec: $(obj)%
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$(OBJCOPY) -O srec $< $@ 2>/dev/null
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$(BIN):
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$(obj)%.bin: $(obj)%
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$(OBJCOPY) -O binary $< $@ 2>/dev/null
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#########################################################################
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# defines $(obj).depend target
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include $(SRCTREE)/rules.mk
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sinclude $(obj).depend
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#########################################################################
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