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Groups > linux.debian.bugs.dist > #930925

Bug#914543: meson adds both -fPIE and -fPIC options in LTO compiles with gcc-8

From Jussi Pakkanen <jpakkane@gmail.com>
Newsgroups linux.debian.bugs.dist
Subject Bug#914543: meson adds both -fPIE and -fPIC options in LTO compiles with gcc-8
Date 2018-12-01 23:00 +0100
Message-ID <x0lsR-2dv-3@gated-at.bofh.it> (permalink)
References <wXIFk-oQ-9@gated-at.bofh.it> <wXIFk-oQ-9@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Sat, Nov 24, 2018 at 6:09 PM John David Anglin <dave.anglin@bell.net> wrote:

> My understanding is -fPIE should be used when creating objects for a
> PIE executable.  -fPIC should be used when creating objects for a shared
> library.  Only one is recorded when -flto is specified.

I reviewed the code and we only add -fPIE arguments when building
executables. The discussion on the other bug seems to support this:

-------------

Most of the problem is in systemd's top meson.build file:

# the oss-fuzz fuzzers are not built with -fPIE, so don't
# enable it when we are linking against them
if not fuzzer_build
        possible_cc_flags += '-fPIE'
        possible_link_flags += '-pie'
endif

------------

Thus it would seem that this is not a bug in Meson, but instead in
systemd's build setup as the pie arguments are added by the latter.

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Thread

Bug#914543: meson adds both -fPIE and -fPIC options in LTO compiles with gcc-8 Jussi Pakkanen <jpakkane@gmail.com> - 2018-12-01 23:00 +0100
  Bug#914543: meson adds both -fPIE and -fPIC options in LTO compiles with gcc-8 Jussi Pakkanen <jpakkane@gmail.com> - 2018-12-01 23:30 +0100
    Bug#914543: meson adds both -fPIE and -fPIC options in LTO compiles with gcc-8 John David Anglin <dave.anglin@bell.net> - 2018-12-02 17:40 +0100
      Bug#914543: meson adds both -fPIE and -fPIC options in LTO compiles with gcc-8 Jussi Pakkanen <jpakkane@gmail.com> - 2018-12-02 18:00 +0100
    Bug#914543: meson adds both -fPIE and -fPIC options in LTO compiles with gcc-8 John David Anglin <dave.anglin@bell.net> - 2019-01-13 15:30 +0100
  Bug#914543: meson adds both -fPIE and -fPIC options in LTO compiles with gcc-8 John David Anglin <dave.anglin@bell.net> - 2018-12-01 23:40 +0100
    Bug#909396: Bug#914543: meson adds both -fPIE and -fPIC options in LTO compiles with gcc-8 John David Anglin <dave.anglin@bell.net> - 2019-01-10 16:30 +0100
      Bug#909396: Bug#914543: meson adds both -fPIE and -fPIC options in LTO compiles with gcc-8 John David Anglin <dave.anglin@bell.net> - 2019-01-10 17:50 +0100
    Bug#909396: Bug#914543: meson adds both -fPIE and -fPIC options in LTO compiles with gcc-8 John David Anglin <dave.anglin@bell.net> - 2019-01-12 19:40 +0100

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