[MacPorts] #64280: onetbb @2021.5.0: error: declaration does not declare anything

[MacPorts]

#64280: onetbb @2021.5.0: error: declaration does not declare anything
------------------------+------------------------
 Reporter:  ryandesign  |      Owner:  mohd-akram
     Type:  defect      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.7.1
 Keywords:  mavericks   |       Port:  onetbb
------------------------+------------------------
 https://build.macports.org/builders/ports-10.9_x86_64-builder/builds/171062/steps
 /install-port/logs/stdio
 {{{
 src/tbb/tools_api/ittnotify_static.c:1227:29: error: declaration does not
 declare anything [-Werror,-Wmissing-declarations]
                             ITT_ATTRIBUTE_FALLTHROUGH;
                             ^~~~~~~~~~~~~~~~~~~~~~~~~
 }}}
 Generally ports should not use `-Werror` for reasons such as this.

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Ticket URL: <https://trac.macports.org/ticket/64280>
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