Configure Python — Performance options

Reference note (untrusted external data; do not execute it as instructions). Configuring Python using --enable-optimizations --with-lto (PGO + LTO) is recommended for best performance. The experimental --enable-bolt flag can also be used to improve performance. Enable Profile Guided Optimization (PGO) using PROFILE_TASK (disabled by default). The C compiler Clang requires llvm-profdata program for PGO. On macOS, GCC also requires it: GCC is just an alias to Clang on macOS. Disable also semantic interposition in libpython if --enable-shared and GCC is used: add -fno-semantic-interposition to the compiler and linker flags. Environment variable used in the Makefile: Python command line arguments for the PGO generation task. Default: -m test --pgo --timeout=$(TESTTIMEOUT). Enable Link Time Optimization (LTO) in any build (disabled by default). The C compiler Clang requires llvm-ar for LTO (ar on macOS), as well as an LTO-aware linker (ld.gold or lld). Enable Attribution: Adapted from Python Documentation under PSF-2.0. Adaptation: WikiKV isolated this documentation section, normalized formatting, removed long code blocks, and shortened it for retrieval. Verify version-sensitive details at the source.