On Fri, 2016-11-04 at 19:39 +0100, Sebastian Andrzej Siewior wrote: > Debian gcc's is nowdays compiled with --enable-default-pie which means it does > -fPIE by default. This breaks atleast x86-64 compiles. > This is the third attempt to fix it, this time by using runtime detection of > the -fno-PIE compiler switch (it was introduced in gcc 3.4, min required gcc is > currently 3.2) so it can be backported to the stable kernels. > As noted by Al this won't fix `git bisect' of stable kernels prio this commit. > However using always a wrapper around gcc which adds -fno-PIE is not sollution > I want to rely in future. I applied the previous version of "kbuild: add -fno-PIE" plus "scripts/has-stack-protector: add -fno-PIE" to the Debian kernel package of v4.9-rc3 and built with gcc-6, and the results of auto- building so far are (from <https://buildd.debian.org/status/package.php?p=linux&suite=experimental>): Debian Description Result name ---------------------------------------------- amd64 x86_64 OK arm64 ARMv8 OK armel ARMv5 pending armhf ARMv7 pending i386 i686 OK mips MIPS{32,64}r2 big-endian OK mipsel MIPS{32,64}r2 little-endian pending mips64el MIPS64r2, little-endian pending ppc64el POWER8, little-endian OK s390x s390x OK PIE has not been enabled by default on other Debian architectures. The build failures on hppa and sparc64 are unrelated. We do enable CONFIG_KEXEC_FILE on amd64 so I don't know how why that build succeeded without "x86/kexec: add -fno-PIE". Ben. -- Ben Hutchings For every complex problem there is a solution that is simple, neat, and wrong.
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