[MacPorts] #63251: GILDAS build fail on Big Sur / arm64

[MacPorts]

#63251: GILDAS build fail on Big Sur / arm64
-----------------------+----------------------
  Reporter:  rampante  |      Owner:  bardeau
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  gildas    |
-----------------------+----------------------

Old description:

> I've been trying to install gildas on macOS Big Sur 11.4 (Xcode version
> 12.5, M1 chip) without success:
> - at first I got a "ld: framework not found CoreFoundation" error.
> Following [https://trac.macports.org/ticket/59347 this ticket], I
> reinstalled gcc11 and python38 from source
> - now, on the other hand, this warning appears:
> {{{
> -->  Found 3 broken files, matching files to ports
> --->  Found 1 broken port, determining rebuild order
> You can always run 'port rev-upgrade' again to fix errors.
> The following ports will be rebuilt: gildas @202107a+gcc11
> }}}
> and, after a few of attempts, the build is still broken. Running port -d
> -y rev-upgrade yields the following output.

New description:

 I've been trying to install gildas on macOS Big Sur 11.4 (Xcode version
 12.5, M1 chip) without success:
 - at first I got a "ld: framework not found CoreFoundation" error.
 Following [ticket:59347 this ticket], I reinstalled gcc11 and python38
 from source
 - now, on the other hand, this warning appears:
 {{{
 -->  Found 3 broken files, matching files to ports
 --->  Found 1 broken port, determining rebuild order
 You can always run 'port rev-upgrade' again to fix errors.
 The following ports will be rebuilt: gildas @202107a+gcc11
 }}}
 and, after a few of attempts, the build is still broken. Running port -d
 -y rev-upgrade yields the following output.

--

Comment (by ryandesign):

 > Why does MacPorts says "this installation is configured to use libc++"?

 Because MacPorts installations on Mac OS X 10.6 and later are configured
 by default to use libc++. The setting is `cxx_stdlib`. It can be changed
 in macports.conf. The setting does not appear in the default macports.conf
 because it is not really intended to be changed, and if you change it you
 must uninstall and reinstall all C++-using ports.

 > What should be done to avoid this error?

 The port should not compile C++ software using g++. If that cannot be
 avoided, and if the port does not use any C++ libraries installed by
 another port, and if the port does not install any C++ libraries that are
 to be used by other ports, then the port can suppress the warning by
 setting (IIRC) `configure.cxx_stdlib macports-libstdc++`.

-- 
Ticket URL: <https://trac.macports.org/ticket/63251#comment:3>
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