Re: Per-architecture -D options?
Re: Per-architecture -D options?
- Subject: Re: Per-architecture -D options?
- From: Clark Cox <email@hidden>
- Date: Fri, 10 Feb 2006 11:51:39 -0500
On 2/10/06, Dave McCaldon <email@hidden> wrote:
>
> We have a #define that we use across many platforms, MY_BIG_ENDIAN, for big
> endian platforms, we pass it via -D in the makefile. For Universal Builds,
> this of course complicates things because all of the -D args get passed to
> both compiler passes (i.e. the one for ppc and the one for i386).
>
> Is there a way to have architecture specific -D options, for example:
>
> gcc .... -DMY_BIG_ENDIAN_ppc -DMY_LITTLE_ENDIAN_i386
Not if you're running the compiler with a single command like that. If
you run the compiler as two separate invocations (one for each arch)
and then lipo the results together, you can accomplish this, but that
depends on how your makefiles are set up and how much control you have
over them.
If possible, you could add the following to some central header file
in your project (__BIG_ENDIAN__ and __LITTLE_ENDIAN__ are already
defined by gcc automatically):
#ifdef __BIG_ENDIAN__
#define MY_BIG_ENDIAN
#elif defined(__LITTLE_ENDIAN__)
#define MY_LITTLE_ENDIAN
#endif
--
Clark S. Cox III
email@hidden
My CV/Resume:
http://homepage.mac.com/clarkcox3/files/Resume.pdf
http://homepage.mac.com/clarkcox3/files/Resume.html
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