Pyyaml: pip install appears to fail on macos (v10.13.4) with python 3.7.0b3

[brianbruggeman]

I note that there is a request to add Python 3.7 in #144. I'd additionally like to request that the travis build run with both clang and gcc.

Collecting pyyaml
  Using cached PyYAML-3.12.tar.gz
Installing collected packages: pyyaml
  Running setup.py install for pyyaml: started
    Running setup.py install for pyyaml: finished with status 'error'
    Complete output from command <Redacted>/bin/python3.7 -u -c "import setuptools, tokenize;__file__='/private/var/folders/r9/kv1j05355r34570x2f5wpxpr0000gn/T/pip-build-4l5ge40z/pyyaml/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /var/folders/r9/kv1j05355r34570x2f5wpxpr0000gn/T/pip-eg3w59z4-record/install-record.txt --single-version-externally-managed --compile --install-headers <Redacted>/include/site/python3.7/pyyaml:
    running install
    running build
    running build_py
    creating build
    creating build/lib.macosx-10.13-x86_64-3.7
    creating build/lib.macosx-10.13-x86_64-3.7/yaml
    copying lib3/yaml/scanner.py -> build/lib.macosx-10.13-x86_64-3.7/yaml
    copying lib3/yaml/error.py -> build/lib.macosx-10.13-x86_64-3.7/yaml
    copying lib3/yaml/constructor.py -> build/lib.macosx-10.13-x86_64-3.7/yaml
    copying lib3/yaml/composer.py -> build/lib.macosx-10.13-x86_64-3.7/yaml
    copying lib3/yaml/events.py -> build/lib.macosx-10.13-x86_64-3.7/yaml
    copying lib3/yaml/__init__.py -> build/lib.macosx-10.13-x86_64-3.7/yaml
    copying lib3/yaml/representer.py -> build/lib.macosx-10.13-x86_64-3.7/yaml
    copying lib3/yaml/tokens.py -> build/lib.macosx-10.13-x86_64-3.7/yaml
    copying lib3/yaml/dumper.py -> build/lib.macosx-10.13-x86_64-3.7/yaml
    copying lib3/yaml/cyaml.py -> build/lib.macosx-10.13-x86_64-3.7/yaml
    copying lib3/yaml/parser.py -> build/lib.macosx-10.13-x86_64-3.7/yaml
    copying lib3/yaml/reader.py -> build/lib.macosx-10.13-x86_64-3.7/yaml
    copying lib3/yaml/loader.py -> build/lib.macosx-10.13-x86_64-3.7/yaml
    copying lib3/yaml/resolver.py -> build/lib.macosx-10.13-x86_64-3.7/yaml
    copying lib3/yaml/serializer.py -> build/lib.macosx-10.13-x86_64-3.7/yaml
    copying lib3/yaml/nodes.py -> build/lib.macosx-10.13-x86_64-3.7/yaml
    copying lib3/yaml/emitter.py -> build/lib.macosx-10.13-x86_64-3.7/yaml
    warning: build_py: byte-compiling is disabled, skipping.

    running build_ext
    creating build/temp.macosx-10.13-x86_64-3.7
    checking if libyaml is compilable
    clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk -I/usr/local/include -I/usr/local/opt/openssl/include -I/usr/local/opt/sqlite/include -I/usr/local/opt/tcl-tk/include -I<Redacted>/include -I/usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/include/python3.7m -c build/temp.macosx-10.13-x86_64-3.7/check_libyaml.c -o build/temp.macosx-10.13-x86_64-3.7/check_libyaml.o
    checking if libyaml is linkable
    clang build/temp.macosx-10.13-x86_64-3.7/check_libyaml.o -L/usr/local/lib -L/usr/local/opt/openssl/lib -L/usr/local/opt/sqlite/lib -L/usr/local/opt/tcl-tk/lib -lyaml -o build/temp.macosx-10.13-x86_64-3.7/check_libyaml
    building '_yaml' extension
    creating build/temp.macosx-10.13-x86_64-3.7/ext
    clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk -I/usr/local/include -I/usr/local/opt/openssl/include -I/usr/local/opt/sqlite/include -I/usr/local/opt/tcl-tk/include -I<Redacted>/include -I/usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/include/python3.7m -c ext/_yaml.c -o build/temp.macosx-10.13-x86_64-3.7/ext/_yaml.o
    In file included from ext/_yaml.c:271:
    ext/_yaml.h:10:9: warning: 'PyString_CheckExact' macro redefined [-Wmacro-redefined]
    #define PyString_CheckExact PyBytes_CheckExact
            ^
    ext/_yaml.c:139:11: note: previous definition is here
      #define PyString_CheckExact          PyUnicode_CheckExact
              ^
    ext/_yaml.c:1410:17: warning: assigning to 'char *' from 'const char *' discards qualifiers [-Wincompatible-pointer-types-discards-qualifiers]
      __pyx_v_value = yaml_get_version_string();
                    ^ ~~~~~~~~~~~~~~~~~~~~~~~~~
    ext/_yaml.c:2577:52: warning: incompatible pointer types passing 'int (void *, char *, size_t, size_t *)' (aka 'int (void *, char *, unsigned long, unsigned long *)') to parameter of type 'yaml_read_handler_t *' (aka 'int (*)(void *, unsigned char *, unsigned long, unsigned long *)') [-Wincompatible-pointer-types]
        yaml_parser_set_input((&__pyx_v_self->parser), __pyx_f_5_yaml_input_handler, ((void *)__pyx_v_self));
                                                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
    /usr/local/include/yaml.h:1368:30: note: passing argument to parameter 'handler' here
            yaml_read_handler_t *handler, void *data);
                                 ^
    ext/_yaml.c:2818:59: warning: passing 'char *' to parameter of type 'const unsigned char *' converts between pointers to integer types with different sign [-Wpointer-sign]
        yaml_parser_set_input_string((&__pyx_v_self->parser), PyString_AS_STRING(__pyx_v_stream), PyString_GET_SIZE(__pyx_v_stream));
                                                              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    ext/_yaml.h:11:29: note: expanded from macro 'PyString_AS_STRING'
    #define PyString_AS_STRING  PyBytes_AS_STRING
                                ^
    /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/include/python3.7m/bytesobject.h:87:31: note: expanded from macro 'PyBytes_AS_STRING'
    #define PyBytes_AS_STRING(op) (assert(PyBytes_Check(op)), \
                                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    /usr/local/include/yaml.h:1342:30: note: passing argument to parameter 'input' here
            const unsigned char *input, size_t size);
                                 ^
    ext/_yaml.c:4572:38: warning: passing 'yaml_char_t *' (aka 'unsigned char *') to parameter of type 'const char *' converts between pointers to integer types with different sign [-Wpointer-sign]
        __pyx_t_2 = PyUnicode_FromString(__pyx_v_token->data.tag_directive.handle); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 417, __pyx_L1_error)
                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/include/python3.7m/unicodeobject.h:703:17: note: passing argument to parameter 'u' here
        const char *u              /* UTF-8 encoded string */
                    ^
    ext/_yaml.c:4584:38: warning: passing 'yaml_char_t *' (aka 'unsigned char *') to parameter of type 'const char *' converts between pointers to integer types with different sign [-Wpointer-sign]
        __pyx_t_2 = PyUnicode_FromString(__pyx_v_token->data.tag_directive.prefix); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 418, __pyx_L1_error)
                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/include/python3.7m/unicodeobject.h:703:17: note: passing argument to parameter 'u' here
        const char *u              /* UTF-8 encoded string */
                    ^
    ext/_yaml.c:5444:38: warning: passing 'yaml_char_t *' (aka 'unsigned char *') to parameter of type 'const char *' converts between pointers to integer types with different sign [-Wpointer-sign]
        __pyx_t_2 = PyUnicode_FromString(__pyx_v_token->data.alias.value); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 448, __pyx_L1_error)
                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/include/python3.7m/unicodeobject.h:703:17: note: passing argument to parameter 'u' here
        const char *u              /* UTF-8 encoded string */
                    ^
    ext/_yaml.c:5518:38: warning: passing 'yaml_char_t *' (aka 'unsigned char *') to parameter of type 'const char *' converts between pointers to integer types with different sign [-Wpointer-sign]
        __pyx_t_2 = PyUnicode_FromString(__pyx_v_token->data.anchor.value); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 451, __pyx_L1_error)
                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/include/python3.7m/unicodeobject.h:703:17: note: passing argument to parameter 'u' here
        const char *u              /* UTF-8 encoded string */
                    ^
    ext/_yaml.c:5592:38: warning: passing 'yaml_char_t *' (aka 'unsigned char *') to parameter of type 'const char *' converts between pointers to integer types with different sign [-Wpointer-sign]
        __pyx_t_2 = PyUnicode_FromString(__pyx_v_token->data.tag.handle); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 454, __pyx_L1_error)
                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/include/python3.7m/unicodeobject.h:703:17: note: passing argument to parameter 'u' here
        const char *u              /* UTF-8 encoded string */
                    ^
    ext/_yaml.c:5604:38: warning: passing 'yaml_char_t *' (aka 'unsigned char *') to parameter of type 'const char *' converts between pointers to integer types with different sign [-Wpointer-sign]
        __pyx_t_2 = PyUnicode_FromString(__pyx_v_token->data.tag.suffix); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 455, __pyx_L1_error)
                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/include/python3.7m/unicodeobject.h:703:17: note: passing argument to parameter 'u' here
        const char *u              /* UTF-8 encoded string */
                    ^
    ext/_yaml.c:5716:38: warning: passing 'yaml_char_t *' (aka 'unsigned char *') to parameter of type 'const char *' converts between pointers to integer types with different sign [-Wpointer-sign]
        __pyx_t_2 = PyUnicode_DecodeUTF8(__pyx_v_token->data.scalar.value, __pyx_v_token->data.scalar.length, ((char *)"strict")); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 460, __pyx_L1_error)
                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/include/python3.7m/unicodeobject.h:1299:17: note: passing argument to parameter 'string' here
        const char *string,         /* UTF-8 encoded string */
                    ^
    ext/_yaml.c:7424:42: warning: passing 'yaml_char_t *' (aka 'unsigned char *') to parameter of type 'const char *' converts between pointers to integer types with different sign [-Wpointer-sign]
            __pyx_t_4 = PyUnicode_FromString(__pyx_v_tag_directive->handle); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 574, __pyx_L1_error)
                                             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/include/python3.7m/unicodeobject.h:703:17: note: passing argument to parameter 'u' here
        const char *u              /* UTF-8 encoded string */
                    ^
    ext/_yaml.c:7436:42: warning: passing 'yaml_char_t *' (aka 'unsigned char *') to parameter of type 'const char *' converts between pointers to integer types with different sign [-Wpointer-sign]
            __pyx_t_4 = PyUnicode_FromString(__pyx_v_tag_directive->prefix); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 575, __pyx_L1_error)
                                             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/include/python3.7m/unicodeobject.h:703:17: note: passing argument to parameter 'u' here
        const char *u              /* UTF-8 encoded string */
                    ^
    ext/_yaml.c:7655:38: warning: passing 'yaml_char_t *' (aka 'unsigned char *') to parameter of type 'const char *' converts between pointers to integer types with different sign [-Wpointer-sign]
        __pyx_t_4 = PyUnicode_FromString(__pyx_v_event->data.alias.anchor); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 586, __pyx_L1_error)
                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/include/python3.7m/unicodeobject.h:703:17: note: passing argument to parameter 'u' here
        const char *u              /* UTF-8 encoded string */
                    ^
    ext/_yaml.c:7749:40: warning: passing 'yaml_char_t *' (aka 'unsigned char *') to parameter of type 'const char *' converts between pointers to integer types with different sign [-Wpointer-sign]
          __pyx_t_4 = PyUnicode_FromString(__pyx_v_event->data.scalar.anchor); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 591, __pyx_L1_error)
                                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/include/python3.7m/unicodeobject.h:703:17: note: passing argument to parameter 'u' here
        const char *u              /* UTF-8 encoded string */
                    ^
    ext/_yaml.c:7790:40: warning: passing 'yaml_char_t *' (aka 'unsigned char *') to parameter of type 'const char *' converts between pointers to integer types with different sign [-Wpointer-sign]
          __pyx_t_4 = PyUnicode_FromString(__pyx_v_event->data.scalar.tag); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 594, __pyx_L1_error)
                                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/include/python3.7m/unicodeobject.h:703:17: note: passing argument to parameter 'u' here
        const char *u              /* UTF-8 encoded string */
                    ^
    ext/_yaml.c:7811:38: warning: passing 'yaml_char_t *' (aka 'unsigned char *') to parameter of type 'const char *' converts between pointers to integer types with different sign [-Wpointer-sign]
        __pyx_t_4 = PyUnicode_DecodeUTF8(__pyx_v_event->data.scalar.value, __pyx_v_event->data.scalar.length, ((char *)"strict")); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 595, __pyx_L1_error)
                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/include/python3.7m/unicodeobject.h:1299:17: note: passing argument to parameter 'string' here
        const char *string,         /* UTF-8 encoded string */
                    ^
    ext/_yaml.c:8179:40: warning: passing 'yaml_char_t *' (aka 'unsigned char *') to parameter of type 'const char *' converts between pointers to integer types with different sign [-Wpointer-sign]
          __pyx_t_4 = PyUnicode_FromString(__pyx_v_event->data.sequence_start.anchor); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 620, __pyx_L1_error)
                                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/include/python3.7m/unicodeobject.h:703:17: note: passing argument to parameter 'u' here
        const char *u              /* UTF-8 encoded string */
                    ^
    ext/_yaml.c:8220:40: warning: passing 'yaml_char_t *' (aka 'unsigned char *') to parameter of type 'const char *' converts between pointers to integer types with different sign [-Wpointer-sign]
          __pyx_t_4 = PyUnicode_FromString(__pyx_v_event->data.sequence_start.tag); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 623, __pyx_L1_error)
                                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/include/python3.7m/unicodeobject.h:703:17: note: passing argument to parameter 'u' here
        const char *u              /* UTF-8 encoded string */
                    ^
    ext/_yaml.c:8449:40: warning: passing 'yaml_char_t *' (aka 'unsigned char *') to parameter of type 'const char *' converts between pointers to integer types with different sign [-Wpointer-sign]
          __pyx_t_4 = PyUnicode_FromString(__pyx_v_event->data.mapping_start.anchor); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 637, __pyx_L1_error)
                                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/include/python3.7m/unicodeobject.h:703:17: note: passing argument to parameter 'u' here
        const char *u              /* UTF-8 encoded string */
                    ^
    ext/_yaml.c:8490:40: warning: passing 'yaml_char_t *' (aka 'unsigned char *') to parameter of type 'const char *' converts between pointers to integer types with different sign [-Wpointer-sign]
          __pyx_t_4 = PyUnicode_FromString(__pyx_v_event->data.mapping_start.tag); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 640, __pyx_L1_error)
                                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/include/python3.7m/unicodeobject.h:703:17: note: passing argument to parameter 'u' here
        const char *u              /* UTF-8 encoded string */
                    ^
    ext/_yaml.c:10094:38: warning: passing 'yaml_char_t *' (aka 'unsigned char *') to parameter of type 'const char *' converts between pointers to integer types with different sign [-Wpointer-sign]
        __pyx_t_3 = PyUnicode_FromString(__pyx_v_self->parsed_event.data.alias.anchor); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 734, __pyx_L1_error)
                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/include/python3.7m/unicodeobject.h:703:17: note: passing argument to parameter 'u' here
        const char *u              /* UTF-8 encoded string */
                    ^
    ext/_yaml.c:10378:38: warning: passing 'yaml_char_t *' (aka 'unsigned char *') to parameter of type 'const char *' converts between pointers to integer types with different sign [-Wpointer-sign]
        __pyx_t_6 = PyUnicode_FromString(__pyx_v_self->parsed_event.data.scalar.anchor); if (unlikely(!__pyx_t_6)) __PYX_ERR(0, 750, __pyx_L1_error)
                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/include/python3.7m/unicodeobject.h:703:17: note: passing argument to parameter 'u' here
        const char *u              /* UTF-8 encoded string */
                    ^
    ext/_yaml.c:10434:38: warning: passing 'yaml_char_t *' (aka 'unsigned char *') to parameter of type 'const char *' converts between pointers to integer types with different sign [-Wpointer-sign]
        __pyx_t_6 = PyUnicode_FromString(__pyx_v_self->parsed_event.data.sequence_start.anchor); if (unlikely(!__pyx_t_6)) __PYX_ERR(0, 753, __pyx_L1_error)
                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/include/python3.7m/unicodeobject.h:703:17: note: passing argument to parameter 'u' here
        const char *u              /* UTF-8 encoded string */
                    ^
    ext/_yaml.c:10490:38: warning: passing 'yaml_char_t *' (aka 'unsigned char *') to parameter of type 'const char *' converts between pointers to integer types with different sign [-Wpointer-sign]
        __pyx_t_6 = PyUnicode_FromString(__pyx_v_self->parsed_event.data.mapping_start.anchor); if (unlikely(!__pyx_t_6)) __PYX_ERR(0, 756, __pyx_L1_error)
                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/include/python3.7m/unicodeobject.h:703:17: note: passing argument to parameter 'u' here
        const char *u              /* UTF-8 encoded string */
                    ^
    ext/_yaml.c:11109:36: warning: passing 'yaml_char_t *' (aka 'unsigned char *') to parameter of type 'const char *' converts between pointers to integer types with different sign [-Wpointer-sign]
      __pyx_t_2 = PyUnicode_DecodeUTF8(__pyx_v_self->parsed_event.data.scalar.value, __pyx_v_self->parsed_event.data.scalar.length, ((char *)"strict")); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 791, __pyx_L1_error)
                                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/include/python3.7m/unicodeobject.h:1299:17: note: passing argument to parameter 'string' here
        const char *string,         /* UTF-8 encoded string */
                    ^
    ext/_yaml.c:11310:38: warning: passing 'yaml_char_t *' (aka 'unsigned char *') to parameter of type 'const char *' converts between pointers to integer types with different sign [-Wpointer-sign]
        __pyx_t_2 = PyUnicode_FromString(__pyx_v_self->parsed_event.data.scalar.tag); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 804, __pyx_L1_error)
                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/include/python3.7m/unicodeobject.h:703:17: note: passing argument to parameter 'u' here
        const char *u              /* UTF-8 encoded string */
                    ^
    ext/_yaml.c:11841:38: warning: passing 'yaml_char_t *' (aka 'unsigned char *') to parameter of type 'const char *' converts between pointers to integer types with different sign [-Wpointer-sign]
        __pyx_t_3 = PyUnicode_FromString(__pyx_v_self->parsed_event.data.sequence_start.tag); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 837, __pyx_L1_error)
                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/include/python3.7m/unicodeobject.h:703:17: note: passing argument to parameter 'u' here
        const char *u              /* UTF-8 encoded string */
                    ^
    ext/_yaml.c:12435:38: warning: passing 'yaml_char_t *' (aka 'unsigned char *') to parameter of type 'const char *' converts between pointers to integer types with different sign [-Wpointer-sign]
        __pyx_t_3 = PyUnicode_FromString(__pyx_v_self->parsed_event.data.mapping_start.tag); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 876, __pyx_L1_error)
                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/include/python3.7m/unicodeobject.h:703:17: note: passing argument to parameter 'u' here
        const char *u              /* UTF-8 encoded string */
                    ^
    ext/_yaml.c:13141:87: warning: comparison of integers of different signs: 'int' and 'size_t' (aka 'unsigned long') [-Wsign-compare]
      __pyx_t_3 = (((__pyx_v_parser->stream_cache_len - __pyx_v_parser->stream_cache_pos) < __pyx_v_size) != 0);
                     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  ^ ~~~~~~~~~~~~
    ext/_yaml.c:13630:53: warning: incompatible pointer types passing 'int (void *, char *, size_t)' (aka 'int (void *, char *, unsigned long)') to parameter of type 'yaml_write_handler_t *' (aka 'int (*)(void *, unsigned char *, unsigned long)') [-Wincompatible-pointer-types]
      yaml_emitter_set_output((&__pyx_v_self->emitter), __pyx_f_5_yaml_output_handler, ((void *)__pyx_v_self));
                                                        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    /usr/local/include/yaml.h:1830:31: note: passing argument to parameter 'handler' here
            yaml_write_handler_t *handler, void *data);
                                  ^
    ext/_yaml.c:15002:44: warning: assigning to 'yaml_char_t *' (aka 'unsigned char *') from 'char *' converts between pointers to integer types with different sign [-Wpointer-sign]
            __pyx_v_tag_directives_end->handle = PyString_AS_STRING(__pyx_v_handle);
                                               ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    ext/_yaml.c:15117:44: warning: assigning to 'yaml_char_t *' (aka 'unsigned char *') from 'char *' converts between pointers to integer types with different sign [-Wpointer-sign]
            __pyx_v_tag_directives_end->prefix = PyString_AS_STRING(__pyx_v_prefix);
                                               ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    ext/_yaml.c:15454:62: warning: passing 'char *' to parameter of type 'yaml_char_t *' (aka 'unsigned char *') converts between pointers to integer types with different sign [-Wpointer-sign]
        __pyx_t_2 = ((yaml_alias_event_initialize(__pyx_v_event, __pyx_v_anchor) == 0) != 0);
                                                                 ^~~~~~~~~~~~~~
    /usr/local/include/yaml.h:553:63: note: passing argument to parameter 'anchor' here
    yaml_alias_event_initialize(yaml_event_t *event, yaml_char_t *anchor);
                                                                  ^
    ext/_yaml.c:16169:63: warning: passing 'char *' to parameter of type 'yaml_char_t *' (aka 'unsigned char *') converts between pointers to integer types with different sign [-Wpointer-sign]
        __pyx_t_2 = ((yaml_scalar_event_initialize(__pyx_v_event, __pyx_v_anchor, __pyx_v_tag, __pyx_v_value, __pyx_v_length, __pyx_v_plain_implicit, __pyx_v_quoted_implicit, __pyx_v_scalar_style) == 0) != 0);
                                                                  ^~~~~~~~~~~~~~
    /usr/local/include/yaml.h:579:22: note: passing argument to parameter 'anchor' here
            yaml_char_t *anchor, yaml_char_t *tag,
                         ^
    ext/_yaml.c:16169:79: warning: passing 'char *' to parameter of type 'yaml_char_t *' (aka 'unsigned char *') converts between pointers to integer types with different sign [-Wpointer-sign]
        __pyx_t_2 = ((yaml_scalar_event_initialize(__pyx_v_event, __pyx_v_anchor, __pyx_v_tag, __pyx_v_value, __pyx_v_length, __pyx_v_plain_implicit, __pyx_v_quoted_implicit, __pyx_v_scalar_style) == 0) != 0);
                                                                                  ^~~~~~~~~~~
    /usr/local/include/yaml.h:579:43: note: passing argument to parameter 'tag' here
            yaml_char_t *anchor, yaml_char_t *tag,
                                              ^
    ext/_yaml.c:16169:92: warning: passing 'char *' to parameter of type 'yaml_char_t *' (aka 'unsigned char *') converts between pointers to integer types with different sign [-Wpointer-sign]
        __pyx_t_2 = ((yaml_scalar_event_initialize(__pyx_v_event, __pyx_v_anchor, __pyx_v_tag, __pyx_v_value, __pyx_v_length, __pyx_v_plain_implicit, __pyx_v_quoted_implicit, __pyx_v_scalar_style) == 0) != 0);
                                                                                               ^~~~~~~~~~~~~
    /usr/local/include/yaml.h:580:22: note: passing argument to parameter 'value' here
            yaml_char_t *value, int length,
                         ^
    ext/_yaml.c:16603:71: warning: passing 'char *' to parameter of type 'yaml_char_t *' (aka 'unsigned char *') converts between pointers to integer types with different sign [-Wpointer-sign]
        __pyx_t_3 = ((yaml_sequence_start_event_initialize(__pyx_v_event, __pyx_v_anchor, __pyx_v_tag, __pyx_v_implicit, __pyx_v_sequence_style) == 0) != 0);
                                                                          ^~~~~~~~~~~~~~
    /usr/local/include/yaml.h:602:22: note: passing argument to parameter 'anchor' here
            yaml_char_t *anchor, yaml_char_t *tag, int implicit,
                         ^
    ext/_yaml.c:16603:87: warning: passing 'char *' to parameter of type 'yaml_char_t *' (aka 'unsigned char *') converts between pointers to integer types with different sign [-Wpointer-sign]
        __pyx_t_3 = ((yaml_sequence_start_event_initialize(__pyx_v_event, __pyx_v_anchor, __pyx_v_tag, __pyx_v_implicit, __pyx_v_sequence_style) == 0) != 0);
                                                                                          ^~~~~~~~~~~
    /usr/local/include/yaml.h:602:43: note: passing argument to parameter 'tag' here
            yaml_char_t *anchor, yaml_char_t *tag, int implicit,
                                              ^
    ext/_yaml.c:17037:70: warning: passing 'char *' to parameter of type 'yaml_char_t *' (aka 'unsigned char *') converts between pointers to integer types with different sign [-Wpointer-sign]
        __pyx_t_2 = ((yaml_mapping_start_event_initialize(__pyx_v_event, __pyx_v_anchor, __pyx_v_tag, __pyx_v_implicit, __pyx_v_mapping_style) == 0) != 0);
                                                                         ^~~~~~~~~~~~~~
    /usr/local/include/yaml.h:634:22: note: passing argument to parameter 'anchor' here
            yaml_char_t *anchor, yaml_char_t *tag, int implicit,
                         ^
    ext/_yaml.c:17037:86: warning: passing 'char *' to parameter of type 'yaml_char_t *' (aka 'unsigned char *') converts between pointers to integer types with different sign [-Wpointer-sign]
        __pyx_t_2 = ((yaml_mapping_start_event_initialize(__pyx_v_event, __pyx_v_anchor, __pyx_v_tag, __pyx_v_implicit, __pyx_v_mapping_style) == 0) != 0);
                                                                                         ^~~~~~~~~~~
    /usr/local/include/yaml.h:634:43: note: passing argument to parameter 'tag' here
            yaml_char_t *anchor, yaml_char_t *tag, int implicit,
                                              ^
    ext/_yaml.c:18516:42: warning: assigning to 'yaml_char_t *' (aka 'unsigned char *') from 'char *' converts between pointers to integer types with different sign [-Wpointer-sign]
          __pyx_v_tag_directives_end->handle = PyString_AS_STRING(__pyx_v_handle);
                                             ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    ext/_yaml.c:18631:42: warning: assigning to 'yaml_char_t *' (aka 'unsigned char *') from 'char *' converts between pointers to integer types with different sign [-Wpointer-sign]
          __pyx_v_tag_directives_end->prefix = PyString_AS_STRING(__pyx_v_prefix);
                                             ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    ext/_yaml.c:19491:65: warning: passing 'char *' to parameter of type 'yaml_char_t *' (aka 'unsigned char *') converts between pointers to integer types with different sign [-Wpointer-sign]
        __pyx_t_2 = ((yaml_alias_event_initialize((&__pyx_v_event), __pyx_v_anchor) == 0) != 0);
                                                                    ^~~~~~~~~~~~~~
    /usr/local/include/yaml.h:553:63: note: passing argument to parameter 'anchor' here
    yaml_alias_event_initialize(yaml_event_t *event, yaml_char_t *anchor);
                                                                  ^
    ext/_yaml.c:20240:68: warning: passing 'char *' to parameter of type 'yaml_char_t *' (aka 'unsigned char *') converts between pointers to integer types with different sign [-Wpointer-sign]
          __pyx_t_2 = ((yaml_scalar_event_initialize((&__pyx_v_event), __pyx_v_anchor, __pyx_v_tag, __pyx_v_value, __pyx_v_length, __pyx_v_plain_implicit, __pyx_v_quoted_implicit, __pyx_v_scalar_style) == 0) != 0);
                                                                       ^~~~~~~~~~~~~~
    /usr/local/include/yaml.h:579:22: note: passing argument to parameter 'anchor' here
            yaml_char_t *anchor, yaml_char_t *tag,
                         ^
    ext/_yaml.c:20240:84: warning: passing 'char *' to parameter of type 'yaml_char_t *' (aka 'unsigned char *') converts between pointers to integer types with different sign [-Wpointer-sign]
          __pyx_t_2 = ((yaml_scalar_event_initialize((&__pyx_v_event), __pyx_v_anchor, __pyx_v_tag, __pyx_v_value, __pyx_v_length, __pyx_v_plain_implicit, __pyx_v_quoted_implicit, __pyx_v_scalar_style) == 0) != 0);
                                                                                       ^~~~~~~~~~~
    /usr/local/include/yaml.h:579:43: note: passing argument to parameter 'tag' here
            yaml_char_t *anchor, yaml_char_t *tag,
                                              ^
    ext/_yaml.c:20240:97: warning: passing 'char *' to parameter of type 'yaml_char_t *' (aka 'unsigned char *') converts between pointers to integer types with different sign [-Wpointer-sign]
          __pyx_t_2 = ((yaml_scalar_event_initialize((&__pyx_v_event), __pyx_v_anchor, __pyx_v_tag, __pyx_v_value, __pyx_v_length, __pyx_v_plain_implicit, __pyx_v_quoted_implicit, __pyx_v_scalar_style) == 0) != 0);
                                                                                                    ^~~~~~~~~~~~~
    /usr/local/include/yaml.h:580:22: note: passing argument to parameter 'value' here
            yaml_char_t *value, int length,
                         ^
    ext/_yaml.c:20605:76: warning: passing 'char *' to parameter of type 'yaml_char_t *' (aka 'unsigned char *') converts between pointers to integer types with different sign [-Wpointer-sign]
          __pyx_t_2 = ((yaml_sequence_start_event_initialize((&__pyx_v_event), __pyx_v_anchor, __pyx_v_tag, __pyx_v_implicit, __pyx_v_sequence_style) == 0) != 0);
                                                                               ^~~~~~~~~~~~~~
    /usr/local/include/yaml.h:602:22: note: passing argument to parameter 'anchor' here
            yaml_char_t *anchor, yaml_char_t *tag, int implicit,
                         ^
    ext/_yaml.c:20605:92: warning: passing 'char *' to parameter of type 'yaml_char_t *' (aka 'unsigned char *') converts between pointers to integer types with different sign [-Wpointer-sign]
          __pyx_t_2 = ((yaml_sequence_start_event_initialize((&__pyx_v_event), __pyx_v_anchor, __pyx_v_tag, __pyx_v_implicit, __pyx_v_sequence_style) == 0) != 0);
                                                                                               ^~~~~~~~~~~
    /usr/local/include/yaml.h:602:43: note: passing argument to parameter 'tag' here
            yaml_char_t *anchor, yaml_char_t *tag, int implicit,
                                              ^
    ext/_yaml.c:21113:75: warning: passing 'char *' to parameter of type 'yaml_char_t *' (aka 'unsigned char *') converts between pointers to integer types with different sign [-Wpointer-sign]
          __pyx_t_2 = ((yaml_mapping_start_event_initialize((&__pyx_v_event), __pyx_v_anchor, __pyx_v_tag, __pyx_v_implicit, __pyx_v_mapping_style) == 0) != 0);
                                                                              ^~~~~~~~~~~~~~
    /usr/local/include/yaml.h:634:22: note: passing argument to parameter 'anchor' here
            yaml_char_t *anchor, yaml_char_t *tag, int implicit,
                         ^
    ext/_yaml.c:21113:91: warning: passing 'char *' to parameter of type 'yaml_char_t *' (aka 'unsigned char *') converts between pointers to integer types with different sign [-Wpointer-sign]
          __pyx_t_2 = ((yaml_mapping_start_event_initialize((&__pyx_v_event), __pyx_v_anchor, __pyx_v_tag, __pyx_v_implicit, __pyx_v_mapping_style) == 0) != 0);
                                                                                              ^~~~~~~~~~~
    /usr/local/include/yaml.h:634:43: note: passing argument to parameter 'tag' here
            yaml_char_t *anchor, yaml_char_t *tag, int implicit,
                                              ^
    ext/_yaml.c:24143:21: error: no member named 'exc_type' in 'struct _ts'
        *type = tstate->exc_type;
                ~~~~~~  ^
    ext/_yaml.c:24144:22: error: no member named 'exc_value' in 'struct _ts'; did you mean 'curexc_value'?
        *value = tstate->exc_value;
                         ^~~~~~~~~
                         curexc_value
    /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/include/python3.7m/pystate.h:237:15: note: 'curexc_value' declared here
        PyObject *curexc_value;
                  ^
    ext/_yaml.c:24145:19: error: no member named 'exc_traceback' in 'struct _ts'; did you mean 'curexc_traceback'?
        *tb = tstate->exc_traceback;
                      ^~~~~~~~~~~~~
                      curexc_traceback
    /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/include/python3.7m/pystate.h:238:15: note: 'curexc_traceback' declared here
        PyObject *curexc_traceback;
                  ^
    ext/_yaml.c:24152:24: error: no member named 'exc_type' in 'struct _ts'
        tmp_type = tstate->exc_type;
                   ~~~~~~  ^
    ext/_yaml.c:24153:25: error: no member named 'exc_value' in 'struct _ts'; did you mean 'curexc_value'?
        tmp_value = tstate->exc_value;
                            ^~~~~~~~~
                            curexc_value
    /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/include/python3.7m/pystate.h:237:15: note: 'curexc_value' declared here
        PyObject *curexc_value;
                  ^
    ext/_yaml.c:24154:22: error: no member named 'exc_traceback' in 'struct _ts'; did you mean 'curexc_traceback'?
        tmp_tb = tstate->exc_traceback;
                         ^~~~~~~~~~~~~
                         curexc_traceback
    /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/include/python3.7m/pystate.h:238:15: note: 'curexc_traceback' declared here
        PyObject *curexc_traceback;
                  ^
    ext/_yaml.c:24155:13: error: no member named 'exc_type' in 'struct _ts'
        tstate->exc_type = type;
        ~~~~~~  ^
    ext/_yaml.c:24156:13: error: no member named 'exc_value' in 'struct _ts'; did you mean 'curexc_value'?
        tstate->exc_value = value;
                ^~~~~~~~~
                curexc_value
    /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/include/python3.7m/pystate.h:237:15: note: 'curexc_value' declared here
        PyObject *curexc_value;
                  ^
    ext/_yaml.c:24157:13: error: no member named 'exc_traceback' in 'struct _ts'; did you mean 'curexc_traceback'?
        tstate->exc_traceback = tb;
                ^~~~~~~~~~~~~
                curexc_traceback
    /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/include/python3.7m/pystate.h:238:15: note: 'curexc_traceback' declared here
        PyObject *curexc_traceback;
                  ^
    ext/_yaml.c:24212:24: error: no member named 'exc_type' in 'struct _ts'
        tmp_type = tstate->exc_type;
                   ~~~~~~  ^
    ext/_yaml.c:24213:25: error: no member named 'exc_value' in 'struct _ts'; did you mean 'curexc_value'?
        tmp_value = tstate->exc_value;
                            ^~~~~~~~~
                            curexc_value
    /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/include/python3.7m/pystate.h:237:15: note: 'curexc_value' declared here
        PyObject *curexc_value;
                  ^
    ext/_yaml.c:24214:22: error: no member named 'exc_traceback' in 'struct _ts'; did you mean 'curexc_traceback'?
        tmp_tb = tstate->exc_traceback;
                         ^~~~~~~~~~~~~
                         curexc_traceback
    /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/include/python3.7m/pystate.h:238:15: note: 'curexc_traceback' declared here
        PyObject *curexc_traceback;
                  ^
    ext/_yaml.c:24215:13: error: no member named 'exc_type' in 'struct _ts'
        tstate->exc_type = local_type;
        ~~~~~~  ^
    ext/_yaml.c:24216:13: error: no member named 'exc_value' in 'struct _ts'; did you mean 'curexc_value'?
        tstate->exc_value = local_value;
                ^~~~~~~~~
                curexc_value
    /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/include/python3.7m/pystate.h:237:15: note: 'curexc_value' declared here
        PyObject *curexc_value;
                  ^
    ext/_yaml.c:24217:13: error: no member named 'exc_traceback' in 'struct _ts'; did you mean 'curexc_traceback'?
        tstate->exc_traceback = local_tb;
                ^~~~~~~~~~~~~
                curexc_traceback
    /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/include/python3.7m/pystate.h:238:15: note: 'curexc_traceback' declared here
        PyObject *curexc_traceback;
                  ^
    51 warnings and 15 errors generated.
    error: command 'clang' failed with exit status 1

    ----------------------------------------

[minusf]

As homebrew upgraded now to python3.7, pyyaml is not usable on macos at the moment.

[ilovezfs]

Note that if you uninstall libyaml first, then the pip3 install pyyaml succeeds.

[ns408]

Note that if you uninstall libyaml first, then the pip3 install pyyaml succeeds.

This doesn't seem to work on High Sierra (10.13.5) with pip 10.0.1, Python 3.7.0.

[ingydotnet]

I made a small test repo to show @ilovezfs commented solution above: https://github.com/ingydotnet/pyyaml-travis-test/blob/master/.travis.yml

Travis seems to have libyaml already installed by default. The first test fails because it pyyaml fails to pip3 install with libyaml: https://travis-ci.com/ingydotnet/pyyaml-travis-test/builds/77803615#L570

When libyaml is uninstalled, pip3 install pyyaml works: https://travis-ci.com/ingydotnet/pyyaml-travis-test/builds/77803615#L594

This is a temporary workaround until PyYAML-4.2 is released. The PyYAML team is working to get that release ASAP (if the work on building wheels is successful, that should happen tomorrow).

I hope this is helpful in the meantime.

[brianbruggeman]

fwiw - my workaround thus far has seemed to be "okay" but this isn't great for anyone that has ephemeral environments:

pip install git+https://github.com/yaml/pyyaml.git

[ausmith]

We were also struck by this issue. Our workaround was to pin our containers that install PyYAML to use Python 3.6 until this problem is fixed.

[ingydotnet]

We are planning to release PyYAML 3.13 (fixes Python 3.7 usage) in about 6 hours.

[vwal]

ingydotnet commented 6 hours ago
..
We are planning to release PyYAML 3.13 (fixes Python 3.7 usage) in about 6 hours.

Anytime now! :smile:

I just came across this, debugging the PyYAML issue on MacOS.

[ingydotnet]

Closing this. Reopen if still problems with 3.13.