On 07/06/2018 06:45 PM, Benjamin Herrenschmidt wrote: > On Thu, 2018-07-05 at 14:30 -0700, Randy Dunlap wrote: >> Hi, >> >> Is there a good way (or a shortcut) to do something like: >> >> $ make ARCH=powerpc O=PPC32 [other_options] allmodconfig >> to get a PPC32/32BIT allmodconfig >> >> and also be able to do: >> >> $make ARCH=powerpc O=PPC64 [other_options] allmodconfig >> to get a PPC64/64BIT allmodconfig? > > Hrm... O= is for the separate build dir, so there much be something > else. > > You mean having ARCH= aliases like ppc/ppc32 and ppc64 ? Yes. > That would be a matter of overriding some .config defaults I suppose, I > don't know how this is done on other archs. > > I see the aliasing trick in the Makefile but that's about it. > >> Note that arch/x86, arch/sh, and arch/sparc have ways to do >> some flavor(s) of this (from Documentation/kbuild/kbuild.txt; >> sh and sparc based on a recent "fix" patch from me): > > I fail to see what you are actually talking about here ... sorry. Do > you have concrete examples on x86 or sparc ? From what I can tell the > "i386" or "sparc32/sparc64" aliases just change SRCARCH in Makefile and > 32 vs 64-bit is just a Kconfig option... Yes, your summary is mostly correct. I'm just looking for a way to do cross-compile builds that are close to ppc32 allmodconfig and ppc64 allmodconfig. >> x86: i386 for 32 bit, x86_64 for 64 bit >> sh: sh for 32 bit, sh64 for 64 bit >> sparc: sparc32 for 32 bit, sparc64 for 64 bit I saw the powerpc merge-config targets after I sent this original email. I can do my own homebrew that I prefer over those, though. thanks, -- ~Randy -- 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
