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 ---
For example on x86_64 Ubuntu "sudo apt-get install gcc-multilib" is enough and no need to install additional 32-bit toolchain.
arch/x86/config.mk | 5 +++-- arch/x86/cpu/config.mk | 2 +- 2 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/arch/x86/config.mk b/arch/x86/config.mk index 38cb7c9..3106079 100644 --- a/arch/x86/config.mk +++ b/arch/x86/config.mk @@ -16,17 +16,18 @@ PF_CPPFLAGS_X86 := $(call cc-option, -fno-toplevel-reorder, \ 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 +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) $(CFLAGS) -print-libgcc-file-name) +export NORMAL_LIBGCC = $(shell $(CC) $(PLATFORM_CPPFLAGS) -print-libgcc-file-name) CONFIG_USE_PRIVATE_LIBGCC := arch/x86/lib diff --git a/arch/x86/cpu/config.mk b/arch/x86/cpu/config.mk index c1568cac..4b2c873 100644 --- a/arch/x86/cpu/config.mk +++ b/arch/x86/cpu/config.mk @@ -7,7 +7,7 @@
CROSS_COMPILE ?= i386-linux-
-PLATFORM_CPPFLAGS += -DCONFIG_X86 -D__I386__ -march=i386 -Werror +PLATFORM_CPPFLAGS += -DCONFIG_X86 -D__I386__ -Werror
# DO NOT MODIFY THE FOLLOWING UNLESS YOU REALLY KNOW WHAT YOU ARE DOING! LDPPFLAGS += -DRESET_SEG_START=0xffff0000