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Re: -fno-PIE, take #3

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On Fri, Nov 04, 2016 at 07:39:37PM +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.

A wrapper around gcc which adds -fno-PIE doesn't work for the HOSTCC
builds, anyway:

% gcc -fno-PIE -o /tmp/hello /tmp/hello.c
/usr/bin/ld: /tmp/cckzDf9X.o: relocation R_X86_64_32 against `.rodata' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: final link failed: Nonrepresentable section on output
collect2: error: ld returned 1 exit status

Alas, the only workaround I've found which doesn't involve bisecting
the kernel is to add "CC=gcc-5" to the Makefile invocation (assuming
gcc-5 is installed of course).

					- Ted
					

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-fno-PIE, take #3 Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-11-04 19:50 +0100
  [PATCH 1/3] kbuild: add -fno-PIE Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-11-04 19:50 +0100
    Re: [PATCH 1/3] kbuild: add -fno-PIE Michal Marek <mmarek@suse.com> - 2016-11-08 23:20 +0100
      Re: [PATCH 1/3] kbuild: add -fno-PIE Ingo Molnar <mingo@kernel.org> - 2016-11-09 07:20 +0100
        Re: [PATCH 1/3] kbuild: add -fno-PIE Michal Marek <mmarek@suse.com> - 2016-11-09 22:30 +0100
          Re: [PATCH 1/3] kbuild: add -fno-PIE Ingo Molnar <mingo@kernel.org> - 2016-11-10 10:30 +0100
  [PATCH 3/3] x86/kexec: add -fno-PIE Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-11-04 19:50 +0100
  [PATCH 2/3] scripts/has-stack-protector: add -fno-PIE Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-11-04 19:50 +0100
  Re: -fno-PIE, take #3 Theodore Ts'o <tytso@mit.edu> - 2016-11-07 07:40 +0100
  Re: -fno-PIE, take #3 "H. Peter Anvin" <hpa@zytor.com> - 2016-11-07 23:40 +0100
  Re: -fno-PIE, take #3 Borislav Petkov <bp@alien8.de> - 2016-11-08 14:50 +0100
  Re: -fno-PIE, take #3 Ben Hutchings <ben@decadent.org.uk> - 2016-11-09 00:00 +0100

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