OBJC_STANDARD  New in version 3.16.  The OBJC standard whose features are requested to build this target. This property specifies the OBJC standard whose features are requested to build this target. For some compilers, this results in adding a flag such as -std=gnu11 to the compile line. Supported values are:  
90 

Objective C89/C90  
99 

Objective C99  
11 

Objective C11   If the value requested does not result in a compile flag being added for the compiler in use, a previous standard flag will be added instead. This means that using: set_property(TARGET tgt PROPERTY OBJC_STANDARD 11)
 with a compiler which does not support -std=gnu11 or an equivalent flag will not result in an error or warning, but will instead add the -std=gnu99 or -std=gnu90 flag if supported. This "decay" behavior may be controlled with the OBJC_STANDARD_REQUIRED target property. Additionally, the OBJC_EXTENSIONS target property may be used to control whether compiler-specific extensions are enabled on a per-target basis. If the property is not set, and the project has set the C_STANDARD, the value of C_STANDARD is set for OBJC_STANDARD. See the cmake-compile-features(7) manual for information on compile features and a list of supported compilers. This property is initialized by the value of the CMAKE_OBJC_STANDARD variable if it is set when a target is created. 

    
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