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bpo-46576: bpo-46524: Disable compiler optimization within test_peg_generator. (#31015)

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Disable compiler optimization within test_peg_generator.

This speed up test_peg_generator by always disabling compiler
optimizations by using -O0 or equivalent when the test is building its
own C extensions.

A build not using --with-pydebug in order to speed up test execution
winds up with this test taking a very long time as it would do
repeated compilation of parser C code using the same optimization
flags as CPython was built with.

This speeds the test up 6-8x on gps-raspbian.

Also incorporate's #31017's win32 conditional and flags.

Co-authored-by: Kumar Aditya kumaraditya303
This commit is contained in:
Gregory P. Smith 2022-02-02 12:15:16 -08:00 • committed by GitHub
parent 89a0a90c2e
commit 164a017e13
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10
Tools/peg_generator/pegen/build.py
View file

@ -1,6 +1,7 @@
import itertools
import pathlib
import shutil
import sys
import sysconfig
import tempfile
import tokenize
@ -32,6 +33,7 @@ def compile_c_extension(
build_dir: Optional[str] = None,
verbose: bool = False,
keep_asserts: bool = True,
disable_optimization: bool = True, # Significant test_peg_generator speedup.
) -> str:
"""Compile the generated source for a parser generator into an extension module.
@ -61,6 +63,14 @@ def compile_c_extension(
extra_link_args = get_extra_flags("LDFLAGS", "PY_LDFLAGS_NODIST")
if keep_asserts:
extra_compile_args.append("-UNDEBUG")
if disable_optimization:
if sys.platform == 'win32':
extra_compile_args.append("/Od")
extra_link_args.append("/LTCG:OFF")
else:
extra_compile_args.append("-O0")
if sysconfig.get_config_var("GNULD") == "yes":
extra_link_args.append("-fno-lto")
extension = [
Extension(
extension_name,