[MacPorts] #67406: Emacs @28.2+native-compile fails to build on on osx 10.6 - temacs missing files

[MacPorts]

#67406: Emacs @28.2+native-compile fails to build on on osx 10.6 - temacs missing
files
---------------------------+----------------------
  Reporter:  aeggenberger  |      Owner:  drkp
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.8.1
Resolution:                |   Keywords:
      Port:  emacs         |
---------------------------+----------------------

Comment (by aeggenberger):

 I used the workaround and was able to build several versions of 29.1
 -treesitter. All of them locked up at times while trying to native compile
 asynchronously. I traced the problem to this line of code in the
 definition of create_process() in src/process.c.


 {{{
         emacs_read (p->open_fd[READ_FROM_EXEC_MONITOR], &dummy, 1);
 }}}

 The documentation for that block of code is

 {{{
 /* Wait for child_setup to complete in case that vfork is
          actually defined as fork.  The descriptor
          XPROCESS (proc)->open_fd[EXEC_MONITOR_OUTPUT]
          of a pipe is closed at the child side either by close-on-exec
          on successful execve or the _exit call in child_setup.  */
 }}}

 I found that using GDB to force a call to read() to return and then
 continuing would allow native compilation and other asynchronous
 activities to proceed. Commenting out that line and compiling seems to fix
 the issue. I think the check is actually unnecessary because vfork and
 fork seem to have different implementations on OS X 10.6, but I'm not sure
 of that, and I wouldn't be surprised if further breakages result.

-- 
Ticket URL: <https://trac.macports.org/ticket/67406#comment:6>
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