Code review comment for ~mitchdz/ubuntu/+source/python2.7:mitch/focal-py2-opt

Tested 2.7.18-1~20.04.4~focal1

# dpkg -s python2.7 | grep Version
Version: 2.7.18-1~20.04.4~focal1

# python2 -c "import sysconfig; print(sysconfig.get_config_var('CFLAGS'))"
-fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -Wdate-time -D_FORTIFY_SOURCE=2 -g -fdebug-prefix-map=/build/python2.7-aHqux6/python2.7-2.7.18=. -fstack-protector-strong -Wformat -Werror=format-security

# python2 setup.py build_ext --inplace
running build_ext
There is a workaround to now inherit optimization CFLAGS when compiling wheels.
To enable this, set APPLY_LP2002043_UBUNTU_CFLAGS_WORKAROUND in your
environment. See LP: https://launchpad.net/bugs/2002043 for further context.
APPLY_LP2002043_UBUNTU_CFLAGS_WORKAROUND not detected.
building 'test' extension
creating build
creating build/temp.linux-x86_64-2.7
x86_64-linux-gnu-gcc -pthread -fno-strict-aliasing -Wdate-time -D_FORTIFY_SOURCE=2 -g -fdebug-prefix-map=/build/python2.7-aHqux6/python2.7-2.7.18=. -fstack-protector-strong -Wformat -Werror=format-security -fPIC -I/usr/include/python2.7 -c testmodule.c -o build/temp.linux-x86_64-2.7/testmodule.o
creating build/lib.linux-x86_64-2.7
x86_64-linux-gnu-gcc -pthread -shared -Wl,-O1 -Wl,-Bsymbolic-functions -Wl,-Bsymbolic-functions -Wl,-z,relro -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -Wdate-time -D_FORTIFY_SOURCE=2 -g -fdebug-prefix-map=/build/python2.7-aHqux6/python2.7-2.7.18=. -fstack-protector-strong -Wformat -Werror=format-security -Wl,-Bsymbolic-functions -Wl,-z,relro -Wdate-time -D_FORTIFY_SOURCE=2 -g -fdebug-prefix-map=/build/python2.7-aHqux6/python2.7-2.7.18=. -fstack-protector-strong -Wformat -Werror=format-security -fPIC build/temp.linux-x86_64-2.7/testmodule.o -o build/lib.linux-x86_64-2.7/test.so

No -02 optimization flag was used, now to use WA

# rm -rf build/ test.so
# export APPLY_LP2002043_UBUNTU_CFLAGS_WORKAROUND=""
# python2 setup.py build_ext --inplace
running build_ext
There is a workaround to now inherit optimization CFLAGS when compiling wheels.
To enable this, set APPLY_LP2002043_UBUNTU_CFLAGS_WORKAROUND in your
environment. See LP: https://launchpad.net/bugs/2002043 for further context.
APPLY_LP2002043_UBUNTU_CFLAGS_WORKAROUND detected, using workaround.
building 'test' extension
creating build
creating build/temp.linux-x86_64-2.7
x86_64-linux-gnu-gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -Wdate-time -D_FORTIFY_SOURCE=2 -g -fdebug-prefix-map=/build/python2.7-aHqux6/python2.7-2.7.18=. -fstack-protector-strong -Wformat -Werror=format-security -fPIC -I/usr/include/python2.7 -c testmodule.c -o build/temp.linux-x86_64-2.7/testmodule.o
creating build/lib.linux-x86_64-2.7
x86_64-linux-gnu-gcc -pthread -shared -Wl,-O1 -Wl,-Bsymbolic-functions -Wl,-Bsymbolic-functions -Wl,-z,relro -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -Wdate-time -D_FORTIFY_SOURCE=2 -g -fdebug-prefix-map=/build/python2.7-aHqux6/python2.7-2.7.18=. -fstack-protector-strong -Wformat -Werror=format-security -Wl,-Bsymbolic-functions -Wl,-z,relro -Wdate-time -D_FORTIFY_SOURCE=2 -g -fdebug-prefix-map=/build/python2.7-aHqux6/python2.7-2.7.18=. -fstack-protector-strong -Wformat -Werror=format-security -fPIC build/temp.linux-x86_64-2.7/testmodule.o -o build/lib.linux-x86_64-2.7/test.so
copying build/lib.linux-x86_64-2.7/test.so ->