[MacPorts] #61492: Cannot build openmpi-gcc10, mpich-gcc10, etc. on macOS 11.0.1 Big Sur, Xcode 12.2

[MacPorts]

#61492: Cannot build openmpi-gcc10, mpich-gcc10, etc. on macOS 11.0.1 Big Sur,
Xcode 12.2
-------------------------------+--------------------
  Reporter:  ChristopherMayes  |      Owner:  (none)
      Type:  defect            |     Status:  new
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:  2.6.4
Resolution:                    |   Keywords:
      Port:  openmpi-gcc10     |
-------------------------------+--------------------

Comment (by astroboylrx):

 Replying to [comment:6 jxy]:
 > It's the packaged `libtool.m4` in the source distribution inside `mpich`
 and `openmpi`.  The `libtool` installed by `macports` has the proper
 patch.  For `openmpi`, you need to run `autogen.pl`, and for `mpich`
 `autogen.sh`.  Maybe we can also patch all the `libtool.m4` files instead.

 This method works for me while installing `openmpi-gcc9` or `mpich-gcc9`
 or `mpich-clang`.  After running `autogen`, `port install` then directly
 starts building processes. However, it fails when I tried to install
 `mpich-clang80 +gcc9`, seemingly because the variant makes `port install`
 re-run configuration anyway and reports `failed to configure` (log info
 below).

 {{{
 configure:6487: checking whether the C compiler works
 configure:6509: /opt/local/bin/clang-mp-8.0 -pipe -Os
 -isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX11.0.sdk -arch
 x86_64 -isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX11.0.sdk
 -Wl,-headerpad_max_install_names
 -Wl,-syslibroot,/Library/Developer/CommandLineTools/SDKs/MacOSX11.0.sdk
 conftest.c  >&5
 clang: error: invalid version number in 'MACOSX_DEPLOYMENT_TARGET=11.0'
 configure:6513: $? = 1
 configure:6551: result: no
 configure: failed program was:
 | /* confdefs.h */
 | #define PACKAGE_NAME "Open MPI"
 | #define PACKAGE_TARNAME "openmpi"
 | #define PACKAGE_VERSION "4.0.1"
 | #define PACKAGE_STRING "Open MPI 4.0.1"
 | #define PACKAGE_BUGREPORT "http://www.open-mpi.org/community/help/"
 | #define PACKAGE_URL ""
 | #define OPAL_ARCH "i386-apple-darwin20.1.0"
 | /* end confdefs.h.  */
 |
 | int
 | main ()
 | {
 |
 |   ;
 |   return 0;
 | }
 configure:6556: error: in
 `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_r
 elease_tarballs_ports_science_openmpi/openmpi-clang80/work/build':
 configure:6558: error: C compiler cannot create executables
 See `config.log' for more details
 }}}

 How should I fix this error? Any suggestions would be greatly appreciated!

-- 
Ticket URL: <https://trac.macports.org/ticket/61492#comment:10>
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