[MacPorts] #37601: libc-headers installs stdio.h masking OS libc header

[MacPorts]

#37601: libc-headers installs stdio.h masking OS libc header
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  Reporter:  ciserlohn@…   |      Owner:  mfeiri@…
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.1.2
Resolution:                |   Keywords:
      Port:  libc-headers  |
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Comment (by ciserlohn@…):

 Replying to [comment:7 mfeiri@…]:
 > Not sure what the difference is between the headers provided by the
 libc-headers port and the OS libc headers on that 10.7 machine. I'll try
 to investigate.

 The difference is that <sys/cdefs.h> (which gets included by stdio.h) is
 missing in the headers installed by libc-headers.
 {{{__DARWIN_LDBL_COMPAT}}} is defined in cdefs.h which explains the error
 shown in [comment:2 comment 2]. I don't know the cpp include machinery
 good engough to explain why cdefs.h from /usr/include/sys is not used
 instead. It should be in the include search path.

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Ticket URL: <https://trac.macports.org/ticket/37601#comment:8>
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