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Re: iPhone Platform Compiler Symbol?
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Re: iPhone Platform Compiler Symbol?


  • Subject: Re: iPhone Platform Compiler Symbol?
  • From: Gwynne Raskind <email@hidden>
  • Date: Fri, 15 May 2009 00:13:43 -0400

On May 14, 2009, at 11:45 PM, Clark Cox wrote:
# gcc -dM -E -x c /dev/null > gccdefs.txt

and

# cpp -dM < /dev/null > cppdefs.txt

Show no difference in the output files.
I think cpp is currently a call through to gcc so theoretically they
should always produce the same set of defines given equivalent options.


True or false?
True, though the whole story is slightly more complicated. A little fiddling
about with the -v flag actually shows the following:


1. cpp is a wrapper for gcc-4.0 -E
2. gcc-4.0 -E in turn calls through to cc1 -E -traditional-cpp
3. cpp-4.2 and gcc-4.2 call through to cc1 -E

As a side note, one of the correct answers to the OP's question is:

#if defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE == 1
   "#if defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE == 1"
and
   "#if TARGET_OS_IPHONE == 1"
are 100% synonymous. On top of that, I would recommend just using:
   "#if TARGET_OS_IPHONE"

You've never written PHP, have you? :)

But anyway, try setting your base SDK to MacOSX10.5 and doing "#if TARGET_OS_IPHONE". You'll get a compiler warning for an undefined macro (unless you have that warning shut off). A harmless warning, but my version avoids it in all cases without any penalty.

-- Gwynne, Daughter of the Code
"This whole world is an asylum for the incurable."
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  • Follow-Ups:
    • Re: iPhone Platform Compiler Symbol?
      • From: Clark Cox <email@hidden>
References: 
 >iPhone Platform Compiler Symbol? (From: "K. Chen" <email@hidden>)
 >Re: iPhone Platform Compiler Symbol? (From: Chris Espinosa <email@hidden>)
 >Re: iPhone Platform Compiler Symbol? (From: Michael Crawford <email@hidden>)
 >Re: iPhone Platform Compiler Symbol? (From: Philip Aker <email@hidden>)
 >Re: iPhone Platform Compiler Symbol? (From: Peter O'Gorman <email@hidden>)
 >Re: iPhone Platform Compiler Symbol? (From: Philip Aker <email@hidden>)
 >Re: iPhone Platform Compiler Symbol? (From: Gwynne Raskind <email@hidden>)
 >Re: iPhone Platform Compiler Symbol? (From: Clark Cox <email@hidden>)

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