setup.py: do not add invalid header locations This piece of code incorrectly adds /usr/include to self.compiler.include_dirs, and results in the following invalid compilation line: /home/thomas/projets/buildroot/output/host/usr/bin/arm-none-linux-gnueabi-gcc -fPIC -Wno-unused-result -Werror=declaration-after-statement -DNDEBUG -g -O3 -Wall -Wstrict-prototypes -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -pipe -Os -I./Include -I/usr/include -I. -IInclude -I/home/thomas/projets/buildroot/output/host/usr/arm-buildroot-linux-gnueabi/sysroot/usr/include -I/home/thomas/projets/buildroot/output/build/python3-3.4.0b1/Include -I/home/thomas/projets/buildroot/output/build/python3-3.4.0b1 -c /home/thomas/projets/buildroot/output/build/python3-3.4.0b1/Modules/_struct.c -o build/temp.linux-arm-3.4/home/thomas/projets/buildroot/output/build/python3-3.4.0b1/Modules/_struct.o cc1: warning: include location "/usr/include" is unsafe for cross-compilation [-Wpoison-system-directories] The -I/usr/include is wrong when cross compiling, so we disable adding INCLUDEDIR and LIBDIR from the host when cross compiling. Signed-off-by: Thomas Petazzoni Index: b/setup.py =================================================================== --- a/setup.py +++ b/setup.py @@ -493,7 +493,8 @@ add_dir_to_list(dir_list, directory) if os.path.normpath(sys.base_prefix) != '/usr' \ - and not sysconfig.get_config_var('PYTHONFRAMEWORK'): + and not sysconfig.get_config_var('PYTHONFRAMEWORK') \ + and not cross_compiling: # OSX note: Don't add LIBDIR and INCLUDEDIR to building a framework # (PYTHONFRAMEWORK is set) to avoid # linking problems when # building a framework with different architectures than