CODEWITHSUNDEEP
iphoneobjective-ciosxcodemacros
Graham Bell
Graham Bell

Reputation: 1149

Use of undeclared identifier for a macro

In my app i'm performing following steps

1) Created a .h file Say, GlobalMacros.h

In GlobalMacros.h

#define IP_ADDR @“SERVER_IP”

2) In my apps .pch file

import “GlobalMacros.h”

Then in rest of the other classes i'm using this IP_ADDR macro in iOS<5.0 no Problems but in iOS>5.0 i'm getting an error use of undeclared identifier IP_ADDR

Upvotes: 3

Views: 2826

Answers (1)

David Hoerl
David Hoerl

Reputation: 41642

The reason is one of these:

  • the .pch file has some #if test that conditionally includes #import "GlobalMacros.h" if the build version is less than iOS5

  • the GlobalMacros.h file has the conditional #if in it

  • some header or source file has a #if statement in it that undefines IP_ADDR

  • in the project that is less than iOS5, the .pch file is using a different GlobalMacros.h file, not the one that has the IP_ADDR define in it

EDIT: I should add that in Xcode4.5, I have this global macros file included in my .pch file. For some reason, the preprocessor gets confused, and the source code editor is showing unknown macros in many files, seemingly at random. What I am doing is as I get errors, adding the global macros file to the affected file.

Upvotes: 3

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