[MacPorts] #9053: BUG gmp: crash in config.guess due to mfpvr instruction

[MacPorts]

#9053: BUG gmp: crash in config.guess due to mfpvr instruction
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  Reporter:  vincent-opdarw@…           |       Owner:  gwright@…           
      Type:  defect                     |      Status:  assigned            
  Priority:  Low                        |   Milestone:  Port Bugs           
 Component:  ports                      |     Version:  1.0                 
Resolution:                             |    Keywords:                      
      Port:  gmp                        |  
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Comment(by mcalhoun@…):

 Replying to [comment:21 vinc17@…]:
 > Replying to [comment:20 mcalhoun@…]:
 > > -force_cpusubtype_ALL is required on PPC architectures or else gmp
 won't work properly.
 >
 > What is the cause? (I think it may be related to broken CPU subtype
 detection.)
 In the configure script is the following:
 {{{
           *-*-darwin*)
             # On Darwin we can use 64-bit instructions with a longlong
 limb,
             # but the chip still in 32-bit mode.
             # In theory this can be used on any OS which knows how to save
             # 64-bit registers in a context switch.
             #
             # Note that we must use -mpowerpc64 with gcc, since the
             # longlong.h macros expect limb operands in a single 64-bit
             # register, not two 32-bit registers as would be given for a
             # long long without -mpowerpc64.  In theory we could detect
 and
             # accomodate both styles, but the proper 64-bit registers will
             # be fastest and are what we really want to use.
             #
             # One would think -mpowerpc64 would set the assembler in the
 right
             # mode to handle 64-bit instructions.  But for that, also
             # -force_cpusubtype_ALL is needed.
 }}}
 So it is possible that -force_cpusubtype_ALL is required to get the PowePC
 to be in the correct state.[[BR]]
 I admit I do not understand the intricacies of processor architectures.

 I think the bottom line is that as far a I know, gmp builds and runs just
 as the developers intended.[[BR]]
 If there is a particular patch, however, we can reopen the discussion.

-- 
Ticket URL: <http://trac.macports.org/ticket/9053#comment:22>
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