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Build flags: Require SSE2 on i686 (#1592212)

This commit is contained in:
Florian Weimer 2018-06-18 11:48:31 +02:00
parent c7d6417a3b
commit a5c98437e2
3 changed files with 15 additions and 6 deletions
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14
buildflags.md
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@ -276,10 +276,16 @@ tuning in the `gcc` package. These settings are:
with other ARMv7-A implementations). `-mabi=aapcs-linux` switches to
the AAPCS ABI for GNU/Linux.
* **i686**: `-march=i686` is used to select a minmum support CPU level
of i686 (corresponding to the Pentium Pro). `-mtune=generic` activates
tuning for a current blend of CPUs (under the assumption that most
users of i686 packages obtain them through an x86_64 installation
on current hardware).
of i686 (corresponding to the Pentium Pro). SSE2 support is
enabled with `-msse2` (so only CPUs with SSE2 support can run the
compiled code; SSE2 was introduced first with the Pentium 4).
`-mtune=generic` activates tuning for a current blend of CPUs
(under the assumption that most users of i686 packages obtain them
through an x86_64 installation on current hardware).
`-mfpmath=sse` instructs GCC to use the SSE2 unit for floating
point math to avoid excess precision issues. `-mstackrealign`
avoids relying on the stack alignment guaranteed by the current
version of the i386 ABI.
* **ppc64le**: `-mcpu=power8 -mtune=power8` selects a minimum supported
CPU level of POWER8 (the first CPU with ppc64le support) and tunes
for POWER8.

5
redhat-rpm-config.spec
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@ -6,7 +6,7 @@
Summary: Red Hat specific rpm configuration files
Name: redhat-rpm-config
Version: 112
Version: 113
Release: 1%{?dist}
# No version specified.
License: GPL+
@ -184,6 +184,9 @@ install -p -m 755 -t %{buildroot}%{_rpmconfigdir} kmod.prov
%{_rpmconfigdir}/macros.d/macros.kmp
%changelog
* Mon Jun 18 2018 Florian Weimer <fweimer@redhat.com> - 113-1
- Build flags: Require SSE2 on i686 (#1592212)
* Mon May 28 2018 Miro Hrončok <mhroncok@redhat.com> - 112-1
- Add a possibility to opt-out form automagic Python bytecompilation
https://fedoraproject.org/wiki/Changes/No_more_automagic_Python_bytecompilation

2
rpmrc
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@ -3,7 +3,7 @@ include: /usr/lib/rpm/rpmrc
optflags: i386 %{__global_compiler_flags} -m32 -march=i386 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection
optflags: i486 %{__global_compiler_flags} -m32 -march=i486 -fasynchronous-unwind-tables -fstack-clash-protection
optflags: i586 %{__global_compiler_flags} -m32 -march=i586 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection
optflags: i686 %{__global_compiler_flags} -m32 -march=i686 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection
optflags: i686 %{__global_compiler_flags} -m32 -march=i686 -mtune=generic -msse2 -mfpmath=sse -mstackrealign -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection
optflags: athlon %{__global_compiler_flags} -m32 -march=athlon -fasynchronous-unwind-tables -fstack-clash-protection
optflags: ia64 %{__global_compiler_flags}
optflags: x86_64 %{__global_compiler_flags} -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection