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Disable peg generator tests when building with PGO
Otherwise, when running the testsuite, test_peg_generator tries to compile C code using the optimized flags and fails because it cannot find the profile data. https://bugs.python.org/issue42207
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Lib/test/test_peg_generator/test_c_parser.py

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import sysconfig
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import textwrap
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import unittest
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from distutils.tests.support import TempdirManager
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from test.support import os_helper
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from test.support.script_helper import assert_python_ok
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_py_cflags_nodist = sysconfig.get_config_var('PY_CFLAGS_NODIST')
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_pgo_flag = sysconfig.get_config_var('PGO_PROF_USE_FLAG')
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if _pgo_flag and _py_cflags_nodist and _pgo_flag in _py_cflags_nodist:
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raise unittest.SkipTest("peg_generator test disabled under PGO build")
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test_tools.skip_if_missing("peg_generator")
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with test_tools.imports_under_tool("peg_generator"):
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from pegen.grammar_parser import GeneratedParser as GrammarParser

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