python build from source

_bz2 build Failed

在使用从源码构建的bzip2时，若出现如下错误

building '_bz2' extension
gcc -pthread -fPIC -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -std=c99 -Wextra -Wno-unused-result -Wno-unused-parameter -Wno-missing-field-initializers -Werror=implicit-function-declaration -I./Include/internal -I./Include -I. -I/usr/include/x86_64-linux-gnu -I/usr/local/include -I/home/cty-devops/packages/Python-3.8.7/Include -I/home/cty-devops/packages/Python-3.8.7 -c /home/cty-devops/packages/Python-3.8.7/Modules/_bz2module.c -o build/temp.linux-x86_64-3.8/home/cty-devops/packages/Python-3.8.7/Modules/_bz2module.o
gcc -pthread -shared build/temp.linux-x86_64-3.8/home/cty-devops/packages/Python-3.8.7/Modules/_bz2module.o -L/usr/lib/x86_64-linux-gnu -L/usr/local/lib -lbz2 -o build/lib.linux-x86_64-3.8/_bz2.cpython-38-x86_64-linux-gnu.so
/usr/bin/ld: /usr/local/lib/libbz2.a(bzlib.o): relocation R_X86_64_32S against `BZ2_crc32Table' can not be used when making a shared object; recompile with -fPIC
/usr/local/lib/libbz2.a: error adding symbols: Bad value
collect2: error: ld returned 1 exit status

　重新安装bzip2

cd bzip2-1.0.6/

# 替换makefile中的CC=gcc为CC=gcc -fPIC
vim MakeFile
vim Makefile-libbz2_so

make && make install　　

参考https://stackoverflow.com/questions/63326781/usr-local-lib-libbz2-a-could-not-read-symbols-bad-value

Openssl更新

build时需要更新openssl

Could not build the ssl module!
Python requires an OpenSSL 1.0.2 or 1.1 compatible libssl with X509_VERIFY_PARAM_set1_host().
LibreSSL 2.6.4 and earlier do not provide the necessary APIs, https://github.com/libressl-portable/portable/issues/381

下载 openssl 源码 https://github.com/openssl/openssl/releases

unzip openssl-OpenSSL_1_1_1i.zip
cd openssl-OpenSSL_1_1_1i
./config shared
make
make install
mkdir lib
cp ./*.{so,so.1.1,a,pc} ./lib

cd /your_python_source_code
export LD_LIBRARY_PATH=/path/to/openssl-OpenSSL_1_1_1i/lib:$LD_LIBRARY_PATH

LDFLAGS="-L/path/to/openssl-OpenSSL_1_1_1i/lib" ./configure (all your preferred options) --with-openssl=/path/to/openssl-OpenSSL_1_1_1i
make
make altinstall

　　参考https://stackoverflow.com/questions/53543477/building-python-3-7-1-ssl-module-failed

若出现

File "/usr/local/lib/python3.8/ssl.py", line 98, in <module>
    import _ssl             # if we can't import it, let the error propagate
ImportError: libssl.so.1.1: cannot open shared object file: No such file or directory

　　在/etc/ld.so.conf中加入/path/to/openssl-OpenSSL_1_1_1i/lib

echo "/path/to/openssl-OpenSSL_1_1_1i/lib" >> /etc/ld.so.conf
ldconfig -v

若出现uwsgi无法编译报ssl相关错误，尝试删除yum安装的openssl-devel  

 yum remove openssl-devel

　　（参考https://blog.csdn.net/rongDang/article/details/102871874）