安装‘`dulwich`’会产生‘错误:命令'clang’失败，退出状态为1‘

Question

当我尝试执行pip install dulwich时，我最后会遇到一堵红色的墙，抱怨clang。这是最后一点：

    Please check your Xcode installation
    clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk -I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/usr/include -I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/Tk.framework/Versions/8.5/Headers -I/usr/local/include -I/usr/local/opt/openssl/include -I/usr/local/opt/openssl/include -I/usr/local/include -I/usr/local/opt/openssl@1.1/include -I/usr/local/opt/sqlite/include -I/Users/alaird/Developer/py3venv/include -I/usr/local/Cellar/python/3.7.4_1/Frameworks/Python.framework/Versions/3.7/include/python3.7m -c dulwich/_objects.c -o build/temp.macosx-10.14-x86_64-3.7/dulwich/_objects.o
    clang: warning: no such sysroot directory: '/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk' [-Wmissing-sysroot]
    In file included from dulwich/_objects.c:20:
    /usr/local/Cellar/python/3.7.4_1/Frameworks/Python.framework/Versions/3.7/include/python3.7m/Python.h:25:10: fatal error: 'stdio.h' file not found
    #include <stdio.h>
             ^~~~~~~~~
    1 error generated.
    error: command 'clang' failed with exit status 1
    ----------------------------------------
ERROR: Command "/Users/alaird/Developer/py3venv/bin/python -u -c 'import setuptools, tokenize;__file__='"'"'/private/var/folders/63/r_rf7mhj14b4c42mfkkl06t8rg1b1r/T/pip-install-b9wlh7xh/dulwich/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record /private/var/folders/63/r_rf7mhj14b4c42mfkkl06t8rg1b1r/T/pip-record-_v0dq_sp/install-record.txt --single-version-externally-managed --compile --install-headers /Users/alaird/Developer/py3venv/include/site/python3.7/dulwich" failed with error code 1 in /private/var/folders/63/r_rf7mhj14b4c42mfkkl06t8rg1b1r/T/pip-install-b9wlh7xh/dulwich/

我在谷歌上写了很多"clang失败了，退出状态1“的兔子洞，问题是这太普通了。要回答以下几个问题：

1. 是的，Xcode是最新版本，已经安装了命令行工具(我在OSX10.14.6上，所以现在通过应用程序更新来管理)。这个错误是在我做了一个venv.
2. Attempting之后开始发生的，它吹走了我的culprit.
3. Doing来安装最新的setuptools运行到相同的错误，所以感觉到指向Xcode/my构建环境(而不是dulwich)的错误是正确的brew update也给了我相同的clang barf。我想当我升级到莫哈韦的时候，有东西被冲洗了。

。

想法？

Answer 1

啊-哈！

我开始查看警告，而不是错误：

no such sysroot directory: '/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk' [-Wmissing-sysroot]

这让我注意到SDK版本号是硬编码的..。这听起来很愚蠢。所以我建立了一个符号链接：

ln -s /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/ /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk

根据您的系统配置，您可能需要构建不同的符号链接(还有一个MacOSX10.15.sdk文件夹)。

那就成功了！pip (包括安装dulwich和pycrypto)没有问题，brew也没有问题，我的开发环境也很好！

我也这样做了：

export CFLAGS="-isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk"

然而，我不认为这是做它的原因，因为在开始一个新的会议后，所有的工作仍然有效。所以很可能是上面的符号联系解决了这个问题。希望这能帮到别人！