New submission from Octavian Soldea: Hi All,
This is Octavian Soldea from the Scripting Languages Optimization team at Intel Corporation. I would like to submit a patch to fix an LTO build issue. With "./configure --with-lto" followed by "make", CPython should be built with LTO or Link-Time-Optimization. However, currently, no impact is made to the build process, meaning the flag is not effective. This patch has been created out of a python-dev discussion thread: http://www.mail-archive.com/python-dev@python.org/msg96469.html. The LTO flag was originally introduced by my team member Alecsandru Patrascu back in 2015: https://bugs.python.org/issue25702. Before the change: ./configure --with-lto make gcc command line output example: gcc -pthread -c -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -std=c99 -Wextra -Wno-unused-result -Wno-unused-parameter -Wno-missing-field-initializers -Werror=implicit-function-declaration -I. -I./Include -DPy_BUILD_CORE -o Python/ceval.o Python/ceval.c Note no "lto" flag was present. This is the same result as the default build without the LTO flag. After changes: ./configure --with-lto make expected gcc command line output example => gcc -pthread -c -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -flto -fuse-linker-plugin -ffat-lto-objects -flto-partition=none -std=c99 -Wextra -Wno-unused-result -Wno-unused-parameter -Wno-missing-field-initializers -Werror=implicit-function-declaration -I. -I./Include -DPy_BUILD_CORE -o Python/ceval.o Python/ceval.c Thanks, Octavian ---------- components: Build messages: 301381 nosy: octavian.soldea priority: normal severity: normal status: open title: Fixing a bug related to LTO only build type: enhancement versions: Python 3.7 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue31354> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
