Centos7安装uwsgi出现关于SSL错误的问题

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本文详细记录了解决uwsgi在编译过程中遇到的与OpenSSL相关的链接错误问题，作者发现通过pip安装uwsgi时，即使已安装openssl-devel，仍会遇到ssl报错。最终，作者发现是由于旧版的OpenSSL与新版冲突导致，通过卸载旧版OpenSSL解决了问题。

问题如下

    core/subscription.o: In function `uwsgi_remove_subscribe_node':
    subscription.c:(.text+0x942): undefined reference to `EVP_MD_CTX_free'
    subscription.c:(.text+0x991): undefined reference to `EVP_MD_CTX_free'
    core/subscription.o: In function `subscription_new_sign_ctx':
    subscription.c:(.text+0x13c5): undefined reference to `EVP_MD_CTX_new'
    subscription.c:(.text+0x1456): undefined reference to `EVP_MD_CTX_free'
    core/ssl.o: In function `uwsgi_ssl_init':
    ssl.c:(.text+0xa9): undefined reference to `OPENSSL_init_ssl'
    ssl.c:(.text+0xb5): undefined reference to `OPENSSL_init_ssl'
    ssl.c:(.text+0xc1): undefined reference to `OPENSSL_init_crypto'
    core/ssl.o: In function `uwsgi_ssl_new_server_context':
    ssl.c:(.text+0x200): undefined reference to `TLS_server_method'
    ssl.c:(.text+0x2e5): undefined reference to `SSL_CTX_set_options'
    ssl.c:(.text+0x321): undefined reference to `SSL_CTX_set_options'
    ssl.c:(.text+0x53e): undefined reference to `SSL_CTX_set_options'
    core/ssl.o: In function `uwsgi_rsa_sign':
    ssl.c:(.text+0x7ac): undefined reference to `EVP_MD_CTX_new'
    ssl.c:(.text+0x832): undefined reference to `EVP_MD_CTX_free'
    ssl.c:(.text+0x955): undefined reference to `EVP_MD_CTX_free'
    core/ssl.o: In function `uwsgi_sni_cb':
    ssl.c:(.text+0xe1b): undefined reference to `SSL_CTX_get_options'
    ssl.c:(.text+0xe26): undefined reference to `SSL_set_options'
    collect2: error: ld returned 1 exit status
    *** error linking uWSGI ***
    ----------------------------------------
ERROR: Command errored out with exit status 1: /usr/local/bin/python3.7 -u tokenize; sys.argv[0] = '"'"'/tmp/pip-install-jx63zvlz/uwsgi/setup.py'"'"';all-jx63zvlz/uwsgi/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(ace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"cord /tmp/pip-record-uzoxgmp4/install-record.txt --single-version-externalle logs for full command output.

上面还省略了很长一段，在此之前我已经安装了openssl-devel, 在此之前有在别地方看到说通过anaconda安装uwsgi，因为不想去再安装anaconda就没有尝试这个方式: https://github.com/unbit/uwsgi/issues/1516

github上的解决方案2:https://github.com/unbit/uwsgi/issues/1516

我的问题以及解决方法：

卸载openssl-devel

我的问题是之前通过yum安装了openssl-devel，但是使用pip命令时还是出现ssl报错，因为pip命令用不了，所以又通过源码编译安装了新的OpenSSL(OpenSSL 1.1.1a),但是忘记卸载了yum安装的OpenSSL(openssl-devel-1.0.2),估计是这两个冲突了，卸载yum安装的OpenSSL后就好了，白忙活了好一阵

卸载OpenSSL yum remove openssl-devel