[MacPorts] #64602: libusb: Configuration logfiles contain indications of -Wimplicit-function-declaration in "strchr"

[MacPorts]

#64602: libusb: Configuration logfiles contain indications of -Wimplicit-function-
declaration in "strchr"
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  Reporter:  judaew  |      Owner:  michaelld
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.7.1
Resolution:          |   Keywords:  wimplicit-function-declaration
      Port:  libusb  |
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Comment (by michaelld):

 Getting such an error may be intentional by the developer. In this case
 this is an intentional check to see if `strchr` is implicitly defined or
 not. The code is actually part of `autoconf`, not `libusb`. I have a patch
 to add a `#warning` to this test in AC; with this patch, we could tweak
 then `Wimplicit-function-declaration` port check for the warning to not
 report these specific messages (which I don't have a patch for yet).
 Beyond this patch, I'm not aware of a way of hiding theses messages.

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Ticket URL: <https://trac.macports.org/ticket/64602#comment:1>
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