OSX使用quadprog的时候报错
File "quadprog/quadprog.pyx", line 91, in quadprog.solve_qp
或者报
typeerror: 'float' object cannot be interpreted as an integer
反复pip install/uninstall后确定问题出现在qpsolvers包
clang: warning: libstdc++ is deprecated; move to libc++ with a minimum deployment target of OS X 10.9 [-Wdeprecated]
ld: library not found for -lstdc++
clang: error: linker command failed with exit code 1 (use -v to see invocation)
error: command 'g++' failed with exit status 1
使用pip install qpsolvers会报以上错误。原因是OS X（我使用的10.15.7）下lib的问题。
使用以下命令即可
CFLAGS=-stdlib=libc++ pip install qpsolvers
