Re: iPhone Platform Compiler Symbol?
Re: iPhone Platform Compiler Symbol?
- Subject: Re: iPhone Platform Compiler Symbol?
- From: Clark Cox <email@hidden>
- Date: Thu, 14 May 2009 20:45:39 -0700
On Thu, May 14, 2009 at 6:18 PM, Gwynne Raskind <email@hidden> wrote:
> On May 14, 2009, at 8:54 PM, Philip Aker 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"
--
Clark S. Cox III
email@hidden
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