Question

try to apply a patch and compile received warning message:

<some_file>: In function '-[XXXXX saveAndCreate:]':
<some_file>:262: warning: 'NSString' may not respond to '-stringByReplacingOccurrencesOfString:withString:'
<some_file>:262: warning: (Messages without a matching method signature
<some_file>:262: warning: will be assumed to return 'id' and accept
<some_file>:262: warning: '...' as arguments.)
distcc[6493] ERROR: compile (null) on localhost failed

which is complaining about this code,

[clientHost findAvailableIn:
    [clientHost defaultVMPath]
    baseName:
        [displayName stringByAppendingPathExtension:PL_BUNDLE_EXTENSION]
    nameFormat:[[displayName
                     stringByReplacingOccurrencesOfString:@"%"
                                               withString:@"%%"]
                     stringByAppendingString:@" %u.xxxx"]
    startIndex:2
    contextInfo:contextInfo];

and here is part of the compile command:

lin32/gcc-5363-1/bin/i686-apple-darwin8-gcc -mmacosx-version-min=10.4 -arch i386 -march=pentium-m -mtune=prescott -Werror -Wall -Wno-trigraphs -Wreturn-type -Wunused-variable -pipe -O2 -g3 -gfull -Wno-pointer-sign -x objective-c -fobjc-exceptions -fpascal-strings -fmessage-length=0 

googled the warning and tried the method here , but still got warning message alike.

i am ignorant in Mac development, spare me if this is something obvious (and i donnot know if the information provide above is surfficent, let me know what else needed to provide). thanx.

edit:
1) extend the code block.
2) correct the warning message.

Answer 1

The warning is referencing a different line the one you cited. The message you use is called stringByReplacingOccurrencesOfString:withString: which is fine on NSString. However the method replaceOccurrencesOfString:withString attempts to change the receiver. NSString is immutable and can therefore not be changed. If you want to use that method send it to a NSMutableString object.