gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -DNDEBUG -g -fwrapv -O3 -Wall -v   -std=c99 -Wextra -Wno-unused-result -Wno-unused-parameter -Wno-missing-field-initializers -Wstrict-prototypes -Werror=implicit-function-declaration   -I. -I./Include     -DPy_BUILD_CORE -c ./Modules/posixmodule.c -o Modules/posixmodule.o
Apple LLVM version 10.0.0 (clang-1000.11.45.2)
Target: x86_64-apple-darwin18.0.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
 "/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang" -cc1 -triple x86_64-apple-macosx10.14.0 -Wdeprecated-objc-isa-usage -Werror=deprecated-objc-isa-usage -emit-obj -disable-free -disable-llvm-verifier -discard-value-names -main-file-name posixmodule.c -mrelocation-model pic -pic-level 2 -mthread-model posix -mdisable-fp-elim -fno-strict-return -masm-verbose -munwind-tables -target-cpu penryn -dwarf-column-info -debug-info-kind=standalone -dwarf-version=4 -debugger-tuning=lldb -target-linker-version 409.12 -v -coverage-notes-file /Users/bwarsaw/projects/python/cpython/Modules/posixmodule.gcno -resource-dir /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/10.0.0 -D NDEBUG -I . -I ./Include -D Py_BUILD_CORE -O3 -Wno-unused-result -Wsign-compare -Wunreachable-code -Wall -Wextra -Wno-unused-result -Wno-unused-parameter -Wno-missing-field-initializers -Wstrict-prototypes -Werror=implicit-function-declaration -std=c99 -fdebug-compilation-dir /Users/bwarsaw/projects/python/cpython -ferror-limit 19 -fmessage-length 131 -fwrapv -stack-protector 1 -fblocks -fencode-extended-block-signature -fobjc-runtime=macosx-10.14.0 -fmax-type-align=16 -fdiagnostics-show-option -vectorize-loops -vectorize-slp -o Modules/posixmodule.o -x c ./Modules/posixmodule.c
clang -cc1 version 10.0.0 (clang-1000.11.45.2) default target x86_64-apple-darwin18.0.0
#include "..." search starts here:
#include <...> search starts here:
 .
 ./Include
 /usr/local/include
 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/10.0.0/include
 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include
 /usr/include
 /System/Library/Frameworks (framework directory)
 /Library/Frameworks (framework directory)
End of search list.
./Modules/posixmodule.c:1254:9: warning: code will never be executed [-Wunreachable-code]
        PyErr_SetFromErrno(PyExc_OSError);
        ^~~~~~~~~~~~~~~~~~
1 warning generated.