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authorH. Peter Anvin <hpa@linux.intel.com>2012-02-27 14:09:10 -0800
committerH. Peter Anvin <hpa@linux.intel.com>2012-02-27 14:09:10 -0800
commit0bf6276392e990dd0da0ccd8e10f42597d503f29 (patch)
tree11c01cc99a28ab84f8d8790baedd104bb825e970 /arch/x86/Makefile
parente0a449cab53814b73faf824284a6b3809b9b1316 (diff)
downloadlinux-0bf6276392e990dd0da0ccd8e10f42597d503f29.tar.bz2
x32: Warn and disable rather than error if binutils too old
If X32 is enabled in .config, but the binutils can't build it, issue a warning and disable the feature rather than erroring out. In order to support this, have CONFIG_X86_X32 be the option set in Kconfig, and CONFIG_X86_X32_ABI be the option set by the Makefile when it is enabled and binutils has been found to be functional. Requested-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com> Cc: H. J. Lu <hjl.tools@gmail.com> Link: http://lkml.kernel.org/r/1329696488-16970-1-git-send-email-hpa@zytor.com
Diffstat (limited to 'arch/x86/Makefile')
-rw-r--r--arch/x86/Makefile16
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index 209ba1294592..31bb1eb1216a 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -82,6 +82,22 @@ ifdef CONFIG_CC_STACKPROTECTOR
endif
endif
+ifdef CONFIG_X86_X32
+ x32_ld_ok := $(call try-run,\
+ /bin/echo -e '1: .quad 1b' | \
+ $(CC) $(KBUILD_AFLAGS) -c -xassembler -o "$$TMP" - && \
+ $(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMPO" && \
+ $(LD) -m elf32_x86_64 "$$TMPO" -o "$$TMP",y,n)
+ ifeq ($(x32_ld_ok),y)
+ CONFIG_X86_X32_ABI := y
+ KBUILD_AFLAGS += -DCONFIG_X86_X32_ABI
+ KBUILD_CFLAGS += -DCONFIG_X86_X32_ABI
+ else
+ $(warning CONFIG_X86_X32 enabled but no binutils support)
+ endif
+endif
+export CONFIG_X86_X32_ABI
+
# Don't unroll struct assignments with kmemcheck enabled
ifeq ($(CONFIG_KMEMCHECK),y)
KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy)