import asyncpg locally with compilation error

• asyncpg version:
  Forked the code to local a few months back. Couldn't find the version number.

• PostgreSQL version:
  11

• Do you use a PostgreSQL SaaS? If so, which? Can you reproduce
  the issue with a local PostgreSQL install?:

• Python version:
  3.6.5

• Platform:
  Mac 10.13

• Do you use pgbouncer?:
  No

• Did you install asyncpg with pip?:
  No

• If you built asyncpg locally, which version of Cython did you use?:
  0.29.15

• Can the issue be reproduced under both asyncio and
  uvloop?:

Trying to import asyncpg locally on my Mac. But have the compilation error. I have the below ```
import statements.
import sys
print(sys.path)
sys.path.append(".")
import asyncio
from aiohttp import web
import pyximport
pyximport.install()
import asyncpg.asyncpg
os.environ['PYTHONASYNCIODEBUG'] = '1'
os.environ['MACOSX_DEPLOYMENT_TARGET'] = '10.13'
import logging
import time

But get the error.

> Compiler crash traceback from this point on:
 

> File "/Users/i3ye/Programming/vsc/ppx-git/venv/lib/python3.6/site-packages/Cython/Compiler/ExprNodes.py", line 6832, in infer_type
>    return node.entry.type
> AttributeError: 'NoneType' object has no attribute 'type'
> /Users/i3ye/.pyxbld/temp.macosx-10.6-intel-3.6/pyrex/asyncpg/asyncpg/protocol/protocol.c:1:2: error: Do not use this file, it is the result of a
>      failed Cython compilation.
> #error Do not use this file, it is the result of a failed Cython compilation.
> ^
> 1 error generated.
> Traceback (most recent call last):
>  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/distutils/unixccompiler.py", line 118, in _compile
>    extra_postargs)
>  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/distutils/ccompiler.py", line 909, in spawn
>    spawn(cmd, dry_run=self.dry_run)
>  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/distutils/spawn.py", line 36, in spawn
>    _spawn_posix(cmd, search_path, dry_run=dry_run)
>  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/distutils/spawn.py", line 159, in _spawn_posix
>    % (cmd, exit_status))
> distutils.errors.DistutilsExecError: command 'gcc' failed with exit status 1
> 
> During handling of the above exception, another exception occurred:
> 
> Traceback (most recent call last):
>  File "/Users/i3ye/Programming/vsc/ppx-git/venv/lib/python3.6/site-packages/pyximport/pyximport.py", line 215, in load_module
>    inplace=build_inplace, language_level=language_level)
>  File "/Users/i3ye/Programming/vsc/ppx-git/venv/lib/python3.6/site-packages/pyximport/pyximport.py", line 191, in build_module
>    reload_support=pyxargs.reload_support)
>  File "/Users/i3ye/Programming/vsc/ppx-git/venv/lib/python3.6/site-packages/pyximport/pyxbuild.py", line 102, in pyx_to_dll
>    dist.run_commands()
>  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/distutils/dist.py", line 955, in run_commands
>    self.run_command(cmd)
>  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/distutils/dist.py", line 974, in run_command
>    cmd_obj.run()
>  File "/Users/i3ye/Programming/vsc/ppx-git/venv/lib/python3.6/site-packages/Cython/Distutils/old_build_ext.py", line 186, in run
>    _build_ext.build_ext.run(self)
>  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/distutils/command/build_ext.py", line 339, in run
>    self.build_extensions()
>  File "/Users/i3ye/Programming/vsc/ppx-git/venv/lib/python3.6/site-packages/Cython/Distutils/old_build_ext.py", line 195, in build_extensions
>    _build_ext.build_ext.build_extensions(self)
>  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/distutils/command/build_ext.py", line 448, in build_extensions
>    self._build_extensions_serial()
>  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/distutils/command/build_ext.py", line 473, in _build_extensions_serial
>    self.build_extension(ext)
>  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/distutils/command/build_ext.py", line 533, in build_extension
>    depends=ext.depends)
>  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/distutils/ccompiler.py", line 574, in compile
>    self._compile(obj, src, ext, cc_args, extra_postargs, pp_opts)
>  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/distutils/unixccompiler.py", line 120, in _compile
>    raise CompileError(msg)
> distutils.errors.CompileError: command 'gcc' failed with exit status 1
> 
> During handling of the above exception, another exception occurred:
> 
> Traceback (most recent call last):
>  File "nowebpool.py", line 8, in <module>
>    import asyncpg.asyncpg
>  File "/Users/i3ye/Programming/vsc/ppx-git/asyncpg/asyncpg/__init__.py", line 8, in <module>
>    from .connection import connect, Connection  # NOQA
>  File "/Users/i3ye/Programming/vsc/ppx-git/asyncpg/asyncpg/connection.py", line 20, in <module>
>    from . import connect_utils
>  File "/Users/i3ye/Programming/vsc/ppx-git/asyncpg/asyncpg/connect_utils.py", line 27, in <module>
>    from . import protocol
>  File "/Users/i3ye/Programming/vsc/ppx-git/asyncpg/asyncpg/protocol/__init__.py", line 8, in <module>
>    from .protocol import Protocol, Record, NO_TIMEOUT  # NOQA
>  File "/Users/i3ye/Programming/vsc/ppx-git/venv/lib/python3.6/site-packages/pyximport/pyximport.py", line 462, in load_module
>    language_level=self.language_level)
>  File "/Users/i3ye/Programming/vsc/ppx-git/venv/lib/python3.6/site-packages/pyximport/pyximport.py", line 231, in load_module
>    raise exc.with_traceback(tb)
>  File "/Users/i3ye/Programming/vsc/ppx-git/venv/lib/python3.6/site-packages/pyximport/pyximport.py", line 215, in load_module
>    inplace=build_inplace, language_level=language_level)
>  File "/Users/i3ye/Programming/vsc/ppx-git/venv/lib/python3.6/site-packages/pyximport/pyximport.py", line 191, in build_module
>    reload_support=pyxargs.reload_support)
>  File "/Users/i3ye/Programming/vsc/ppx-git/venv/lib/python3.6/site-packages/pyximport/pyxbuild.py", line 102, in pyx_to_dll
>    dist.run_commands()
>  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/distutils/dist.py", line 955, in run_commands
>    self.run_command(cmd)
>  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/distutils/dist.py", line 974, in run_command
>    cmd_obj.run()
>  File "/Users/i3ye/Programming/vsc/ppx-git/venv/lib/python3.6/site-packages/Cython/Distutils/old_build_ext.py", line 186, in run
>    _build_ext.build_ext.run(self)
>  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/distutils/command/build_ext.py", line 339, in run
>    self.build_extensions()
>  File "/Users/i3ye/Programming/vsc/ppx-git/venv/lib/python3.6/site-packages/Cython/Distutils/old_build_ext.py", line 195, in build_extensions
>    _build_ext.build_ext.build_extensions(self)
>  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/distutils/command/build_ext.py", line 448, in build_extensions
>    self._build_extensions_serial()
>  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/distutils/command/build_ext.py", line 473, in _build_extensions_serial
>    self.build_extension(ext)
>  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/distutils/command/build_ext.py", line 533, in build_extension
>    depends=ext.depends)
>  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/distutils/ccompiler.py", line 574, in compile
>    self._compile(obj, src, ext, cc_args, extra_postargs, pp_opts)
>  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/distutils/unixccompiler.py", line 120, in _compile
>    raise CompileError(msg)
> ImportError: Building module asyncpg.asyncpg.protocol.protocol failed: ["distutils.errors.CompileError: command 'gcc' failed with exit status 1\n"]
> 
> 
> gcc --version
> Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/4.2.1
> Apple clang version 11.0.0 (clang-1100.0.33.17)
> Target: x86_64-apple-darwin18.7.0
> Thread model: posix
> InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

Python 3.6.5、macOS 10.13、PostgreSQL 11、Cython 0.29.15 を使用して、nowebpool.py からのインポートを再現します。asyncpg/protocol/init.py と protocol モジュールのコンパイラ traceback から始めます。完了の条件は、Cython または gcc の失敗なしに asyncpg をローカルでインポートできることです。