iOS development of ARC and non-ARC settings with -fno-objc-arc to mark the ARC project files that do not support the ARC

We develop, he often needs to have a non-arc and arc is mixed, so we need to set it up

With -fno-objc-arc to mark those files are not supported in the ARC ARC project

-Fobjc-arc labeled with tags support in a non-ARC ARC project file

Reproduced in: https: //www.cnblogs.com/hecanlin/p/11044728.html