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>
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 @@
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