[MacPorts] #63164: py-libxml2 icu cctools - FAT libraries built on i386 Mac OS X Tiger fail to run

[MacPorts]

#63164: py-libxml2 icu cctools - FAT libraries built on i386 Mac OS X Tiger fail to
run
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  Reporter:  bradleyCPA  |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:              |
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Comment (by kencu):

 Here is an interesting thread from the ancient python bug list showing the
 the system log2 function on MacOSX Tiger i386 (but apparently not ppc) was
 felt to be too buggy to use:

 https://bugs.python.org/issue11888

 I wonder if this issue also happens on ppc then?

 ----

 I am starting to be convinced that the offset should be fixed, indeed.
 That is looking like a good pickup to me, excellent work.

 In the cctools source it indicates that proper code offsets should be page
 aligned, which makes sense, and that means 4096. So so so many complicated
 ports pass their test suites, though, that I have a hard time believing
 that there is widespread wreckage. But then again, pretty much nobody is
 actually using lipo on Tiger any longer because we can't build most things
 universal anyway, so we would not likely have noticed if lipo stopped
 working....esp if it is just lipo on i386 Tiger...

 By the way, the lipo command invocation comes from our Portfile, not from
 gcc7 itself:

 https://github.com/macports/macports-
 ports/blob/6c6143dfd92000f40458ea15bda425cac1d490b6/lang/gcc7/Portfile#L304

 so outside of MacPorts, nobody would ever see or test this exact issue.

 You could rebuild libgcc7 and specify {{{/usr/bin/lipo}}} in the Portfile
 to use the system one. Presumably that generates libgcc7 libraries with
 the 4096 offsets? I would hope.

-- 
Ticket URL: <https://trac.macports.org/ticket/63164#comment:27>
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