[MacPorts] #58881: libgcc 9 dependency cctools requires libunwind-headers with which libgcc9 cannot be build

[MacPorts]

#58881: libgcc 9 dependency cctools requires libunwind-headers with which libgcc9
cannot be build
----------------------------------------------------+---------------------
 Reporter:  vdoublie                                |      Owner:  (none)
     Type:  update                                  |     Status:  new
 Priority:  Normal                                  |  Milestone:
Component:  ports                                   |    Version:
 Keywords:  dependencies conflicts cctools libgcc9  |       Port:  libgcc9
----------------------------------------------------+---------------------
 dependencies incompatibility between cctools dependencies and libgcc9
 through libunwind-headers

 {{{
 sysadmin at pc61 ~ % sudo /opt/local/bin/port deps cctools
 Full Name: cctools @921_3+llvm80
 Build Dependencies:   libunwind-headers
 Library Dependencies: llvm-8.0

 sudo /opt/local/bin/port deps libgcc9
 Full Name: libgcc9 @9.2.0_0
 Extract Dependencies: xz
 Build Dependencies:   cctools, gmp, isl, ld64, libiconv, libmpc, mpfr
 Library Dependencies: zlib
 }}}
 this happens trying to build libgcc9 (or gcc9)  from source
 {{{
 --->  Configuring libgcc9
 Error: libgcc9 cannot be built while libunwind-headers is active.
 Error: Please forcibly deactivate libunwind-headers, e.g. by running:
 Error:
 Error:     sudo port -f deactivate libunwind-headers
 Error:
 Error: Then try again. You can reactivate libunwind-headers again later.
 Error: Failed to configure libgcc9: libunwind-headers is active
 }}}
 manually de-activating  libunwind-headers solves the pb, however this is a
 problem.

 A quick look in the history of "bugs" this is a recurring issue

-- 
Ticket URL: <https://trac.macports.org/ticket/58881>
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