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bpo-46576: bpo-46524: Disable compiler optimization within test_peg_generator. (#31015)
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
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164a017e13
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@ -0,0 +1,3 @@
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test_peg_generator now disables compiler optimization when testing
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compilation of its own C extensions to significantly speed up the
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testing on non-debug builds of CPython.
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@ -1,6 +1,7 @@
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import itertools
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import pathlib
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import shutil
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import sys
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import sysconfig
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import tempfile
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import tokenize
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@ -32,6 +33,7 @@ def compile_c_extension(
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build_dir: Optional[str] = None,
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verbose: bool = False,
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keep_asserts: bool = True,
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disable_optimization: bool = True, # Significant test_peg_generator speedup.
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) -> str:
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"""Compile the generated source for a parser generator into an extension module.
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@ -61,6 +63,14 @@ def compile_c_extension(
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extra_link_args = get_extra_flags("LDFLAGS", "PY_LDFLAGS_NODIST")
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if keep_asserts:
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extra_compile_args.append("-UNDEBUG")
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if disable_optimization:
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if sys.platform == 'win32':
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extra_compile_args.append("/Od")
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extra_link_args.append("/LTCG:OFF")
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else:
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extra_compile_args.append("-O0")
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if sysconfig.get_config_var("GNULD") == "yes":
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extra_link_args.append("-fno-lto")
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extension = [
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Extension(
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extension_name,
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