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Message-ID: <CAK7LNAQFEi=4nky4nxRA8s+ODaf89Wa5kwDhe9dppKWX0UiFJA@mail.gmail.com> Date: Mon, 25 Oct 2021 03:13:40 +0900 From: Masahiro Yamada <masahiroy@...nel.org> To: Rob Landley <rob@...dley.net> Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Andrii Nakryiko <andrii@...nel.org>, Josh Poimboeuf <jpoimboe@...hat.com> Subject: Re: Commit 0d989ac2c90b broke my x86-64 build. On Sun, Oct 24, 2021 at 3:36 PM Rob Landley <rob@...dley.net> wrote: > > The attached config built fine before the above commit, doesn't build after. The > commit in question did nothing except remove support for building x86-64 without > libelf. You enable CONFIG_STACK_VALIDATION in your .config file. At least, you observed "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" in the previous builds. > > It took me a while to notice because the commit ONLY broke x86-64. I can still > build arm (32 and 64 bit), i686, m68k, mips/mipsel, powerpc, s390x, and sh4 > without libelf in my cross compiler. Heck, I can still build i686. The change > seems to have added a unique build dependency to just x86-64. The other architectures are not affected because you cannot enable CONFIG_STACK_VALIDATION. Please note only x86_64 selects HAVE_STACK_VALIDATION. > Rob > > P.S. Why do you need a special library to parse elf anyway? It's a fairly simple > file format, linux has include/linux.elf.h, the toolchain already has an objtool > prefixed for the appropriate cross compiler... You are asking a question about the objtool implementation. CCed Josh Poimboeuf. -- Best Regards Masahiro Yamada
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