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Make use of -fasynchronous-unwind-tables more explicit (#1536431)

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This commit is contained in:
Florian Weimer 2018-01-22 15:17:14 +01:00
parent 5b96b31cac
commit e43ce312b7
3 changed files with 16 additions and 9 deletions
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14
buildflags.md
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@ -168,11 +168,15 @@ not), but their selection depends on the architecture:
* `-fasynchronous-unwind-tables`: Generate full unwind information
covering all program points. This is required for support of
asynchronous cancellation and proper unwinding from signal
handlers. It also makes performance and debugging tools more useful
because unwind information is available without having to install
(and load) debugging information.
This flag is enabled explictly for i686 (and derived architectures),
and implicity for x86-64.
handlers. It also makes performance and debugging tools more
useful because unwind information is available without having to
install (and load) debugging ienformation.
Asynchronous unwind tables are enabled for aarch64, i686, s390x,
and x86-64. They are not needed on armhfp, ppc64 and ppc64le due
to architectural differences in stack management. On these
architectures, `-fexceptions` (see above) still enables regular
unwind tables (or they are enabled by default even without this
option).
In addition, `redhat-rpm-config` re-selects the built-in default
tuning in the `gcc` package. These settings are:

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: 81
Version: 82
Release: 1%{?dist}
# No version specified.
License: GPL+
@ -157,6 +157,9 @@ install -p -m 755 -t %{buildroot}%{_rpmconfigdir} kmod.prov
%{_rpmconfigdir}/macros.d/macros.kmp
%changelog
* Mon Jan 22 2018 Florian Weimer <fweimer@redhat.com> - 82-1
- Make use of -fasynchronous-unwind-tables more explicit (#1536431)
* Mon Jan 22 2018 Florian Weimer <fweimer@redhat.com> - 81-1
- Remove --param=ssp-buffer-size=4

6
rpmrc
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@ -6,7 +6,7 @@ optflags: i586 %{__global_compiler_flags} -m32 -march=i586 -mtune=generic -fasyn
optflags: i686 %{__global_compiler_flags} -m32 -march=i686 -fasynchronous-unwind-tables -fstack-clash-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 -fstack-clash-protection
optflags: x86_64 %{__global_compiler_flags} -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection
optflags: alpha %{__global_compiler_flags} -mieee
optflags: alphaev5 %{__global_compiler_flags} -mieee -mcpu=ev5
@ -71,8 +71,8 @@ optflags: atariclone %{__global_compiler_flags}
optflags: milan %{__global_compiler_flags}
optflags: hades %{__global_compiler_flags}
optflags: s390 %{__global_compiler_flags} -m31 -march=zEC12 -mtune=z13
optflags: s390x %{__global_compiler_flags} -m64 -march=zEC12 -mtune=z13 -fstack-clash-protection
optflags: s390 %{__global_compiler_flags} -m31 -march=zEC12 -mtune=z13 -fasynchronous-unwind-tables
optflags: s390x %{__global_compiler_flags} -m64 -march=zEC12 -mtune=z13 -fasynchronous-unwind-tables -fstack-clash-protection
optflags: aarch64 %{__global_compiler_flags} -fstack-clash-protection