Hi Inada-san,
You can query the sysconfig module to check how Python has been built.
Example:
pyvstinner@apu$ python3
Python 3.7.4 (default, Jul 9 2019, 16:32:37)
[GCC 9.1.1 20190503 (Red Hat 9.1.1-1)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import sysconfig
>>> sysconfig.get_config_var('PY_CFLAGS')
'-Wno-unused-result -Wsign-compare -DDYNAMIC_ANNOTATIONS_ENABLED=1
-DNDEBUG -O2 -g -pipe -Wall -Werror=format-security
-Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions
-fstack-protector-strong -grecord-gcc-switches -m64 -mtune=generic
-fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection
-D_GNU_SOURCE -fPIC -fwrapv'
>>> sysconfig.get_config_var('PY_CFLAGS_NODIST')
'-O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2
-Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong
-grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1
-specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic
-fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection
-D_GNU_SOURCE -fPIC -fwrapv -flto -fuse-linker-plugin
-ffat-lto-objects -flto-partition=none -g -std=c99 -Wextra
-Wno-unused-result -Wno-unused-parameter
-Wno-missing-field-initializers -Wno-cast-function-type
-Werror=implicit-function-declaration -O2 -g -pipe -Wall
-Werror=format-security -Wp,-D_FORTIFY_SOURCE=2
-Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong
-grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1
-specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic
-fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection
-D_GNU_SOURCE -fPIC -fwrapv -fprofile-use -fprofile-correction'
>>> sysconfig.get_config_var('PY_LDFLAGS')
'-Wl,-z,relro -Wl,--as-needed -Wl,-z,now -g'
>>> sysconfig.get_config_var('PY_LDFLAGS_NODIST')
'-Wl,-z,relro -Wl,--as-needed -Wl,-z,now
-specs=/usr/lib/rpm/redhat/redhat-hardened-ld -g -flto
-fuse-linker-plugin -ffat-lto-objects -flto-partition=none -g'
>>> import shlex
>>> [opt for opt in shlex.split(sysconfig.get_config_var('PY_CFLAGS') +
>>> sysconfig.get_config_var('PY_CFLAGS_NODIST')) if opt.startswith('-O') or
>>> 'profile' in opt]
['-O2', '-O2', '-fprofile-use', '-fprofile-correction']
>>> [opt for opt in shlex.split(sysconfig.get_config_var('PY_LDFLAGS') +
>>> sysconfig.get_config_var('PY_LDFLAGS_NODIST')) if 'lto' in opt]
['-flto', '-ffat-lto-objects', '-flto-partition=none']
You can see that Fedora 30 /usr/bin/python3.7 is built using -O2 and
has been optimized with PGO (compiler flag -fprofile-use) and LTO
(linker flag -flto).
Victor
Le mar. 15 oct. 2019 à 11:02, Inada Naoki <songofaca...@gmail.com> a écrit :
>
> Hi, all.
>
> I want Homebrew uses `--enable-optimizations` and `--with-lto` option
> for building Python. But maintainer said:
>
> > Given this is not a default option, probably not, unless it is done in
> > upstream (“official”) binaries.
>
> https://github.com/Homebrew/homebrew-core/pull/45337
>
> Are these options used for official macOS binaries?
> Is there official information about the build step of official binaries?
>
> Regards,
> --
> Inada Naoki <songofaca...@gmail.com>
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