On 24.1.2011 11:35, Philippe Auphelle wrote: > Hi All, > > Building an x86_64 external module from an x86 (32-bit) Linux 2.6.35, > I get a "stack protector enabled but no compiler support" error. > I'm by no way a kbuild (or even make) specialist, but it looks to me > like the problem is this: > > The error is produced in arch/x86/Makefile, line 81. > > Looking further, it looks like this code relies on $(biarch) being set > to the CC bitness parm (-m32 / -m64) to call the cc_has_sp detection > script (line 77). > Problem is, $(biarch) is only set (to -m32) when CONFIG_X86_32 is set > (line 20), but *not* when the else clause is taken (-m64 option is > directly set then in KBUILD_AFLAGS and KBUILD_CFLAGS then, (lines > 49-50) ). > As a result, the detection scripts always fails. > > replacing lines 49-50 by something like: > biarch := $(call cc-option,-m64) > KBUILD_AFLAGS += $(biarch) > KBUILD_CFLAGS += $(biarch) I think you can omit the cc-option call and simply set biarch := -m64, because the gcc x86_64 target always had the -m64 option. > > solves the problem. > > I just checked with the latest 2.6.37, and arch/x86/Makefile hasn't > changed since 2.6.35 (at least not in that part of the file). > > Questions are: > - Could someone more knowledgeable than me in that matter be kind > enough to confirm that this is truely the problem (and a valid > solution)? > and if so, > - Is this the right place to report it to get it eventually fixed? > (and if it ain't, where should it be?) You should send a proper patch (refer to Documentation/SubmittingPatches) to lkml and the people under the "X86 ARCHITECTURE (32-BIT AND 64-BIT)" entry in the MAINTAINERS file. Michal -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
