CFBridgingRetain and CFAutorelease produce warnings under -Wincompatible-pointer-types-discards-qualifiers

Originator:jtbandes
Number:rdar://21374092 Date Originated:6/13/2015
Status:Open Resolved:
Product: Product Version:
Classification: Reproducible:
 
Summary:
The new -Wincompatible-pointer-types-discards-qualifiers warning is produced when using CFBridgingRetain and assigning to a variable of any particular type:


CGColorSpaceRef cspace = CFAutorelease(<some object>);
or 
void *context = CFBridgingRetain(<some object>);

produces

"warning: initializing 'CGColorSpaceRef' (aka 'struct CGColorSpace *') with an expression of type 'CFTypeRef __nullable' (aka 'const void *') discards qualifiers [-Wincompatible-pointer-types-discards-qualifiers]"

Steps to Reproduce:
Try the following code with -Wincompatible-pointer-types-discards-qualifiers enabled (default in Xcode 7):

CGColorSpaceRef cspace = CFAutorelease(<some object>);

// or 

void *context = CFBridgingRetain(<some object>);

Expected Results:
The result of CFBridgingRetain and CFAutorelease should be usable with other CF APIs with no warnings.

Actual Results:
Warnings are produced.

Version:
Xcode 7 beta 1

Comments


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