[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 michaelld):

 I just attached my current shell script that is to be executed by the
 legacy Makefile. It creates the directory `include/IOKit/usb/` in the
 current directory, then patches (via a sed script) the header `USB.h` into
 the new directory. In my testing, this script works on 10.4 and 10.5. It
 will do something only if the `USB.h` header has the issue, and it
 performs basic testing on the resulting header to show that the patching
 works. It needs more testing to verify functionality on newer OSX / MacOSX
 / macOS, from 10.6 through 10.14 and beyond -- to verify for example that
 on 10.15 it does nothing. Next up is to integrate calling it into the
 legacy Makefile, which I hope is easier than creating the script in the
 first place!

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Ticket URL: <https://trac.macports.org/ticket/61868#comment:38>
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