Remove more variables from build environment (#20156)
GCC looks for included files based on several env vars. Remove C_INCLUDE_PATH, CPLUS_INCLUDE_PATH, and OBJC_INCLUDE_PATH from the build environment to ensure it's clean and prevent accidental clobbering.
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@ -149,12 +149,17 @@ def clean_environment():
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# can affect how some packages find libraries. We want to make
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# sure that builds never pull in unintended external dependencies.
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env.unset('LD_LIBRARY_PATH')
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env.unset('LIBRARY_PATH')
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env.unset('CPATH')
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env.unset('LD_RUN_PATH')
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env.unset('DYLD_LIBRARY_PATH')
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env.unset('DYLD_FALLBACK_LIBRARY_PATH')
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# These vars affect how the compiler finds libraries and include dirs.
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env.unset('LIBRARY_PATH')
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env.unset('CPATH')
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env.unset('C_INCLUDE_PATH')
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env.unset('CPLUS_INCLUDE_PATH')
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env.unset('OBJC_INCLUDE_PATH')
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# On Cray "cluster" systems, unset CRAY_LD_LIBRARY_PATH to avoid
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# interference with Spack dependencies.
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# CNL requires these variables to be set (or at least some of them,
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