[MacPorts] #69073: pcre2 fails to build for i386 with gcc-13: no such instruction: `lzcnt %eax, %eax'

[MacPorts]

#69073: pcre2 fails to build for i386 with gcc-13: no such instruction: `lzcnt
%eax, %eax'
---------------------------+-------------------------------
  Reporter:  barracuda156  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.8.1
Resolution:                |   Keywords:  i386, snowleopard
      Port:  pcre2         |
---------------------------+-------------------------------

Comment (by kencu):

 The assembler doesn't understand the noted instruction.

 The assembler used by gcc when building on older Intel systems is
 something that requires a  bit of understanding. By default, the original
 "gas" assembler is used. This is very very old now, however, and is
 missing support for a lot of commonly used instructions.

 Josh modified MacPorts' cctools some years ago now to have the assembler
 spin off to any new clang version that might be installed instead (clang
 can function as just the assembler, and it has support for more modern
 assembly instructions).

 Exactly which clang will be used is where things get murky, but it is
 basically going to be the newest clang you have installed. The details of
 how it is selected are in the cctools portfile and patches.

 In practice, if you have clang-9.0 and clang-11 installed, which you
 commonly do have on these systems, gcc will use one of those as the
 assembler and usually that is sufficient.

 Because this issue didn't come up all that often, it was decided not to
 force gcc to always have a clang installed. However, as time goes by, it
 is coming up more, so perhaps that will need to be forced eventually.

 If you already do have some fairly recent clang installed, and you are
 still seeing this assembler error, then there might be something else
 going on that needs tweaking.

-- 
Ticket URL: <https://trac.macports.org/ticket/69073#comment:1>
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