[MacPorts] #61868: libusb @1.0.24: cannot parse USB.h with mainline gcc versions due to variant pragma handling not accepted by gcc

[MacPorts]

#61868: libusb @1.0.24: cannot parse USB.h with mainline gcc versions due to
variant pragma handling not accepted by gcc
-----------------------------------+-----------------------
  Reporter:  dgonyier              |      Owner:  michaelld
      Type:  defect                |     Status:  reopened
  Priority:  Normal                |  Milestone:
 Component:  ports                 |    Version:  2.6.4
Resolution:                        |   Keywords:
      Port:  libusb, libusb-devel  |
-----------------------------------+-----------------------

Comment (by evanmiller):

 Threw together a quick PR against LegacySupport:
 https://github.com/macports/macports-legacy-support/pull/42

 If we can get this merged and rolled into {{{legacy-support-devel}}} then
 people can start playing with it.

 Inspecting the GCC source, it looks like the relevant pragma-handling code
 is basically unchanged from GCC 4.5 through 11 so hopefully the fix will
 work everywhere.

-- 
Ticket URL: <https://trac.macports.org/ticket/61868#comment:55>
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