Suppress -Wproperty-no-attribute not working in Xcode

Question

In an Xcode 5, ARC, iPhone project, I have received a large number of warnings reading "No 'assign', 'retain', or 'copy' attribute is specified - 'assign' is assumed." I know what this warning means, and why I might want to fix it. But this would take a long time given the size of my project, so I instead want to suppress the warning. However, setting the -Wno-property-no-attribute flag on all of my .m files didn't fix anything, nor did setting the flag at Custom Compiler Flags > Other Warning Flags. I also tried #pragma GCC/clang diagnostic ignored "-Wproperty-no-attribute" before my property declarations, and have cleaned my build folder many times. The warnings persist. (Also, the -w flag did not work to suppress all warnings, when applied to my .m files.)

What should I do?

Answer 1

It turned out that I had made a small typo in the Custom Compiler Flags entry (although I still do not know why the file-per-file flags didn't work), and that the LLVM warning about this was almost invisible, being swamped in the hundreds of other warnings generated.

Answer 2

The pragma statement should be this: #pragma clang diagnostic ignored "-Wobjc-property-no-attribute"