今天在安装P4C的时候，参考了这篇博客
P4语言环境安装-前端编译器p4c、后端编译器p4c-bm2-ss、交换模型bmv2、Tutorial-张华Guido

在进行到这一步时，出现了错误

#安装python-pip
sudo apt install python-pip
#我是安装在/home/guido(user_name)/路径下
git clone https://github.com/nanomsg/nnpy
#进入nnpy文件夹
cd /home/guido/nnpy
#安装nnpy
pip install nnpy	

属于SSL Retry错误，CERTIFICATE ERROR，参考了这篇博客-----完美解决 Could not find a version that satisfies the requirement 安装包名字 (from versions: )–戴国进
的做法，将最后一句改为

pip install nnpy -i http://pypi.douban.com/simple --trusted-host pypi.douban.com

这样做之后，结果仍然出现错误

ERROR: Command errored out with exit status 1:command: /usr/bin/python -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-8xDyxr/nnpy/setup.py'"'"'; __file__='"'"'/tmp/pip-install-8xDyxr/nnpy/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-pip-egg-info-3btyVqcwd: /tmp/pip-install-8xDyxr/nnpy/Complete output (25 lines):Download error on https://pypi.python.org/simple/cffi/: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:727) -- Some packages may not be found!Couldn't find index page for 'cffi' (maybe misspelled?)Download error on https://pypi.python.org/simple/: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:727) -- Some packages may not be found!No local packages or working download links found for cffi>=1.0.0Traceback (most recent call last):File "", line 1, in File "/tmp/pip-install-8xDyxr/nnpy/setup.py", line 28, in install_requires=['cffi'],File "/usr/lib/python2.7/dist-packages/setuptools/__init__.py", line 128, in setup_install_setup_requires(attrs)File "/usr/lib/python2.7/dist-packages/setuptools/__init__.py", line 123, in _install_setup_requiresdist.fetch_build_eggs(dist.setup_requires)File "/usr/lib/python2.7/dist-packages/setuptools/dist.py", line 513, in fetch_build_eggsreplace_conflicting=True,File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 774, in resolvereplace_conflicting=replace_conflictingFile "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 1057, in best_matchreturn self.obtain(req, installer)File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 1069, in obtainreturn installer(requirement)File "/usr/lib/python2.7/dist-packages/setuptools/dist.py", line 580, in fetch_build_eggreturn cmd.easy_install(req)File "/usr/lib/python2.7/dist-packages/setuptools/command/easy_install.py", line 692, in easy_installraise DistutilsError(msg)distutils.errors.DistutilsError: Could not find suitable distribution for Requirement.parse('cffi>=1.0.0')----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.

然后暂时放在一边不管了。。。。。

之后在安装p4c的这一步make check时，

一些例子make check不过

The following tests FAILED:63 - ebpf-bcc/testdata/p4_16_samples/action_call_ebpf.p4 (Failed)64 - ebpf-bcc/testdata/p4_16_samples/action_call_table_ebpf.p4 (Failed)65 - ebpf-bcc/testdata/p4_16_samples/bool_ebpf.p4 (Failed)66 - ebpf-bcc/testdata/p4_16_samples/count_add_ebpf.p4 (Failed)67 - ebpf-bcc/testdata/p4_16_samples/count_ebpf.p4 (Failed)68 - ebpf-bcc/testdata/p4_16_samples/hit_ebpf.p4 (Failed)69 - ebpf-bcc/testdata/p4_16_samples/init_ebpf.p4 (Failed)70 - ebpf-bcc/testdata/p4_16_samples/issue2791_ebpf.p4 (Failed)71 - ebpf-bcc/testdata/p4_16_samples/issue2793_ebpf.p4 (Failed)72 - ebpf-bcc/testdata/p4_16_samples/issue2797_ebpf.p4 (Failed)73 - ebpf-bcc/testdata/p4_16_samples/issue870_ebpf.p4 (Failed)74 - ebpf-bcc/testdata/p4_16_samples/key-issue-1020_ebpf.p4 (Failed)75 - ebpf-bcc/testdata/p4_16_samples/key_ebpf.p4 (Failed)76 - ebpf-bcc/testdata/p4_16_samples/lpm_ebpf.p4 (Failed)77 - ebpf-bcc/testdata/p4_16_samples/stack_ebpf.p4 (Failed)78 - ebpf-bcc/testdata/p4_16_samples/switch_ebpf.p4 (Failed)79 - ebpf-bcc/testdata/p4_16_samples/test_ebpf.p4 (Failed)80 - ebpf-bcc/testdata/p4_16_samples/two_ebpf.p4 (Failed)81 - ebpf-bcc/testdata/p4_16_samples/valid_ebpf.p4 (Failed)82 - ebpf/testdata/p4_16_samples/action_call_ebpf.p4 (Failed)83 - ebpf/testdata/p4_16_samples/action_call_table_ebpf.p4 (Failed)84 - ebpf/testdata/p4_16_samples/bool_ebpf.p4 (Failed)85 - ebpf/testdata/p4_16_samples/count_add_ebpf.p4 (Failed)86 - ebpf/testdata/p4_16_samples/count_ebpf.p4 (Failed)87 - ebpf/testdata/p4_16_samples/hit_ebpf.p4 (Failed)88 - ebpf/testdata/p4_16_samples/init_ebpf.p4 (Failed)89 - ebpf/testdata/p4_16_samples/issue2791_ebpf.p4 (Failed)90 - ebpf/testdata/p4_16_samples/issue2793_ebpf.p4 (Failed)91 - ebpf/testdata/p4_16_samples/issue2797_ebpf.p4 (Failed)92 - ebpf/testdata/p4_16_samples/issue870_ebpf.p4 (Failed)93 - ebpf/testdata/p4_16_samples/key-issue-1020_ebpf.p4 (Failed)94 - ebpf/testdata/p4_16_samples/key_ebpf.p4 (Failed)96 - ebpf/testdata/p4_16_samples/stack_ebpf.p4 (Failed)97 - ebpf/testdata/p4_16_samples/switch_ebpf.p4 (Failed)98 - ebpf/testdata/p4_16_samples/test_ebpf.p4 (Failed)99 - ebpf/testdata/p4_16_samples/two_ebpf.p4 (Failed)100 - ebpf/testdata/p4_16_samples/valid_ebpf.p4 (Failed)101 - ebpf/testdata/p4_16_samples/ebpf_checksum_extern.p4 (Failed)103 - ubpf/testdata/p4_16_samples/action_call_ubpf.p4 (Failed)104 - ubpf/testdata/p4_16_samples/action_fwd_ubpf.p4 (Failed)105 - ubpf/testdata/p4_16_samples/advance_ubpf.p4 (Failed)106 - ubpf/testdata/p4_16_samples/csum_ubpf.p4 (Failed)107 - ubpf/testdata/p4_16_samples/default_action_ubpf.p4 (Failed)108 - ubpf/testdata/p4_16_samples/hash_ubpf.p4 (Failed)109 - ubpf/testdata/p4_16_samples/ipv4-actions_ubpf.p4 (Failed)110 - ubpf/testdata/p4_16_samples/ipv6-actions_ubpf.p4 (Failed)111 - ubpf/testdata/p4_16_samples/lookahead_ubpf.p4 (Failed)112 - ubpf/testdata/p4_16_samples/lpm_ubpf.p4 (Failed)113 - ubpf/testdata/p4_16_samples/metadata_ubpf.p4 (Failed)114 - ubpf/testdata/p4_16_samples/parenthesis-test_ubpf.p4 (Failed)115 - ubpf/testdata/p4_16_samples/simple-actions_ubpf.p4 (Failed)116 - ubpf/testdata/p4_16_samples/simple-firewall_ubpf.p4 (Failed)117 - ubpf/testdata/p4_16_samples/truncate_ubpf.p4 (Failed)118 - ubpf/testdata/p4_16_samples/tunneling_ubpf.p4 (Failed)119 - ubpf/testdata/p4_16_samples/ubpf_hash_extern.p4 (Failed)120 - ubpf/testdata/p4_16_samples/ubpf_checksum_extern.p4 (Failed)

关于这个错误，参考了这篇文章中的说法：Ubuntu16.04中配置p4编程环境（二）–Chin

是由于依赖问题导致的make check错误

想了一下，将需要sudo apt install 的包都安了一遍，仍然没有变化，最后想到了之前pip install nnpy未通过的问题，所以接下来要解决这个nnpy的问题：
从帮助信息可以知道nnpy依赖的包是cffi，所以是不是cffi的错误呢？
我参考了这篇文章cffi python包版本不匹配时出错
升级了cffi包

pip install --upgrade cffi==1.14.6 -i http://pypi.douban.com/simple --trusted-host pypi.douban.com

然后再执行nnpy的安装

pip install nnpy -i http://pypi.douban.com/simple --trusted-host pypi.douban.com

这样之后，nnpy就安装好了

然后回到p4c的make check问题，重新执行，结果如下，问题解决了，果然是依赖的问题且问题应该出在nnpy的安装上