Apple LLVM 5.1错误

Question

When i try to open an old project on Xcode Version 5.1.1, proprecompiler gives the following error

clang: error: unknown argument: '-fobjc' [-Wunused-command-line-argument-hard-error-in-future]
clang: note: this will be a hard error (cannot be downgraded to a warning) in the future

by the way some classes are compiled with -fobjc -arc flag.

Do you have any idea how to fix this?

Answer 1

Looks like you're using the wrong flag. You should be using -fobjc-arc .

Answer 2

Check your compiler flag again , its seems like you are using -fobjc instead of -fobjc-arc .
Use

• Enable ARC -> -fobjc-arc
• Disable ARC -> -fno-objc-arc