Re: Build mysteriously excludes G3s [Solved, but not understood]
Re: Build mysteriously excludes G3s [Solved, but not understood]
- Subject: Re: Build mysteriously excludes G3s [Solved, but not understood]
- From: Greg Guerin <email@hidden>
- Date: Fri, 19 Mar 2010 19:09:41 -0700
James Bucanek wrote:
To date, no one I've discussed this with has any clear idea why
this happens.
http://developer.apple.com/mac/library/DOCUMENTATION/Darwin/Reference/
ManPages/man1/gcc.1.html
- - - -
The subtype of the file created (like ppc7400 or ppc970 or i686) is
determined by the flags that specify the ISA that GCC is targetting,
like -mcpu or -march. The -force_cpusubtype_ALL option can be used
to override this.
The Darwin tools vary in their behavior when presented with an ISA
mismatch. The assembler, as, will only permit instructions to be
used that are valid for the subtype of the file it is generating, so
you cannot put 64-bit instructions in an ppc750 object file. The
linker for shared libraries, /usr/bin/libtool, will fail and print an
error if asked to create a shared library with a less restrictive
subtype than its input files (for instance, trying to put a ppc970
object file in a ppc7400 library). The linker for executables, ld,
will quietly give the executable the most restrictive subtype of any
of its input files.
- - - -
-- GG
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