In c# I can use the following code to have code which only executes during debug build, how can I do the same in xcode?
if #DEBUG
{
// etc etc
}
+6
A:
You can use
#ifdef DEBUG
....
#endif
You'll need to add DEBUG=1 to the project's preprocessor symbol definitions in the Debug configuration's settings as that's not done for you automatically by Xcode.
I personally prefer doing DEBUG=1 over checking for NDEBUG=0, since the latter implies that the default build configuration is with debug information which you then have to explicitly turn off, whereas 'DEBUG=1' implies turning on debug only code.
Alnitak
2009-01-26 11:59:23
+7
A:
The NDEBUG symbol should be defined for you already in release mode builds
#ifndef NDEBUG
/* Debug only code */
#endif
By using NDEBUG you just avoid having to specify a -D DEBUG argument to the compiler yourself for the debug builds
ShuggyCoUk
2009-01-26 12:01:34
but you still have to _add_ NDEBUG to the compiler settings to use release mode. Many programmers prefer #ifdef DEBUG to the double-negative that's in #ifndef NDEBUG
Alnitak
2009-01-26 12:10:50
I get that many people prefer it but NDEBUG for release is the C standard. By adhering to it you will save yourself trouble. NEDBUG should also be defined for you already in the Xcode release builds
ShuggyCoUk
2009-01-26 12:37:09
My apologies XCode doesn't appear to define it by default. here's where you should go to add it in: http://developer.apple.com/tools/xcode/xcodebuildsettings.html
ShuggyCoUk
2009-01-26 12:44:09
p.s. what if he wants to decouple the behaviour of assert() from his own debugging code?
Alnitak
2009-01-26 14:29:26
Absolutely if he wishes to take control himself he will need to make a concious decision and define accordingly. This appears to be the rationale of the XCode implementers in not providing some default definitions in the way VS and others do. I simply though that he should start with the standard.
ShuggyCoUk
2009-01-26 15:02:22
+1
A:
There is a very useful debugging technote: Technical Note TN2124 Mac OS X Debugging Magic http://developer.apple.com/technotes/tn2004/tn2124.html#SECENV which contains lots of useful stuff for debugging your apps.
Tony
Tony Lambert
2009-01-26 12:10:28