u-boot/arch/x86/config.mk
Vasili Galka dbb7234b2a x86: Enable 32-bit build using x86_64 multilib toolchain
Until now building the x86 arch boards required 32-bit toolchain. As
many x86_64 toolchains come with 32-bit support (multilib) that's a
good idea to enable build with such toolchains.

The change required was to specify the usage of 32-bit explicitly to
the compiler and the linker (-m32 and -m elf_i386 flags) and locate
the right libgcc path.

Signed-off-by: Vasili Galka <vvv444@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
2014-06-23 15:37:23 -06:00

33 lines
1.1 KiB
Makefile

#
# (C) Copyright 2000-2002
# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
#
# SPDX-License-Identifier: GPL-2.0+
#
CONFIG_STANDALONE_LOAD_ADDR ?= 0x40000
PLATFORM_CPPFLAGS += -fno-strict-aliasing
PLATFORM_CPPFLAGS += -mregparm=3
PLATFORM_CPPFLAGS += -fomit-frame-pointer
PF_CPPFLAGS_X86 := $(call cc-option, -fno-toplevel-reorder, \
$(call cc-option, -fno-unit-at-a-time)) \
$(call cc-option, -mpreferred-stack-boundary=2)
PLATFORM_CPPFLAGS += $(PF_CPPFLAGS_X86)
PLATFORM_CPPFLAGS += -fno-dwarf2-cfi-asm
PLATFORM_CPPFLAGS += -DREALMODE_BASE=0x7c0
PLATFORM_CPPFLAGS += -march=i386 -m32
# Support generic board on x86
__HAVE_ARCH_GENERIC_BOARD := y
PLATFORM_RELFLAGS += -ffunction-sections -fvisibility=hidden
PLATFORM_LDFLAGS += --emit-relocs -Bsymbolic -Bsymbolic-functions -m elf_i386
LDFLAGS_FINAL += --gc-sections -pie
LDFLAGS_FINAL += --wrap=__divdi3 --wrap=__udivdi3
LDFLAGS_FINAL += --wrap=__moddi3 --wrap=__umoddi3
export NORMAL_LIBGCC = $(shell $(CC) $(PLATFORM_CPPFLAGS) -print-libgcc-file-name)
CONFIG_USE_PRIVATE_LIBGCC := arch/x86/lib