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Antony Lee authored
On Unix, setuptools prepends $CFLAGS and $CPPFLAGS to the compiler flags (they always come before extra_compile_args and anything else; see distutils.sysconfig.customize_compiler). In practice, the environment variables are useful e.g. to quickly generate a debug build (e.g. by setting CFLAGS=-g), but Pybind11Extension currently unconditionally overwrites this with -g0. Instead, check the environment variables and only insert -g0 if not overridden by them.
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