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I have a Problem when I try to compiling my iOS project with iOS 8.
The errors messages are:
Implicit declaration of function 'glReadPixels' is invalid in C99 compiling
Conflicting types for 'glReadPixels'
Declaration of 'glReadPixels' must be imported from module 'OpenGLES.ES3.gl' before it is required
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In C90, if a function is called without an explicit declaration, the compiler is going to complain about the implicit declaration. Here is a small code that will give us an Implicit declaration of function error. Now the above code will give you an error of Implicit declaration.
In C90, if a function is called without an explicit declaration, the compiler is going to complain about the implicit declaration. Here is a small code that will give us an Implicit declaration of function error.
Every function must be explicitly declared before it can be called. In C90, if a function is called without an explicit declaration, the compiler is going to complain about the implicit declaration.
In the case of C99, you can skip the declaration but it will give us a small warning and it can be ignored but the definition of the function is important. This gives us the output:
Recently I have faced the same issue.
The easiest way to resolve this problem is by adding @import OpenGLES; line in each file where you have got this message.
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For iOS 8 is necessary Import
#import <OpenGLES/ES3/glext.h>
This link is the solution Click Here...
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