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@@ -17,7 +17,7 @@
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#global prerel ...
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%global upstream_version %{general_version}%{?prerel}
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Version: %{general_version}%{?prerel:~%{prerel}}
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- Release: 2%{?dist}
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+ Release: 3%{?dist}
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License: Python
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@@ -667,14 +667,14 @@
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# Fedora packages utilizing %%py3_build will use them as well
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# https://fedoraproject.org/wiki/Changes/Python_Extension_Flags
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export CFLAGS="%{extension_cflags} -D_GNU_SOURCE -fPIC -fwrapv"
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- export CFLAGS_NODIST="%{build_cflags} -D_GNU_SOURCE -fPIC -fwrapv"
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+ export CFLAGS_NODIST="%{build_cflags} -D_GNU_SOURCE -fPIC -fwrapv -fno-semantic-interposition"
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export CXXFLAGS="%{extension_cxxflags} -D_GNU_SOURCE -fPIC -fwrapv"
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export CPPFLAGS="$(pkg-config --cflags-only-I libffi)"
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export OPT="%{extension_cflags} -D_GNU_SOURCE -fPIC -fwrapv"
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export LINKCC="gcc"
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export CFLAGS="$CFLAGS $(pkg-config --cflags openssl)"
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export LDFLAGS="%{extension_ldflags} -g $(pkg-config --libs-only-L openssl)"
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- export LDFLAGS_NODIST="%{build_ldflags} -g $(pkg-config --libs-only-L openssl)"
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+ export LDFLAGS_NODIST="%{build_ldflags} -fno-semantic-interposition -g $(pkg-config --libs-only-L openssl)"
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# We can build several different configurations of Python: regular and debug.
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# Define a common function that does one build:
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@@ -1569,6 +1569,10 @@
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# ======================================================
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%changelog
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+ * Tue Dec 03 2019 Miro Hrončok <mhroncok@redhat.com> - 3.8.0-3
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+ - Build Python with -fno-semantic-interposition for better performance
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+ - https://fedoraproject.org/wiki/Changes/PythonNoSemanticInterpositionSpeedup
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+
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* Thu Nov 28 2019 Miro Hrončok <mhroncok@redhat.com> - 3.8.0-2
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- Recommend python3-tkinter when tk is installed
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cstratak
commented 4 years ago
The compiler flag has been added to CFLAGS_NODIST and
LDFLAGS_NODIST. This will compile the core interpreter
and the stdlib modules with -fno-semantic-interposition
but will not affect user build and rpm C extension modules
compiled by distutils.
This has the effect of speeding up the interpreter up to
27%, depending on the workload, with the drawback of disabling
the capability of using LD_PRELOAD to override symbols in
libpython.
https://fedoraproject.org/wiki/Changes/PythonNoSemanticInterpositionSpeedup