[MacPorts] #55005: GMP fails to build on Sierra with Xcode 9.0

[MacPorts]

#55005: GMP fails to build on Sierra with Xcode 9.0
--------------------------+---------------------------------
  Reporter:  lucaspettey  |      Owner:  MarcusCalhoun-Lopez
      Type:  defect       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.4.1
Resolution:               |   Keywords:
      Port:  gmp          |
--------------------------+---------------------------------
Description changed by mf2k:

Old description:

> The following message is received when trying to build gmp on Sierra with
> Xcode 9.0:
>
> --->  Configuring gmp
> Error: Failed to configure gmp, consult
> /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_devel_gmp/gmp/work/gmp-6.1.2/config.log
>
> I will attach the whole log for reference, but the last lines of the log
> file indicate an issue with clang++:
>
> :info:configure checking whether we are using the GNU C++ compiler... yes
> :info:configure checking whether /usr/bin/clang++ -stdlib=libc++ accepts
> -g... yes
> :info:configure checking C++ compiler /usr/bin/clang++ -stdlib=libc++
> -I/opt/local/include -O2 -pedantic -fomit-frame-pointer -m64
> -mtune=sandybridge -march=sandybridge... no, std iostream
> :info:configure checking C++ compiler /usr/bin/clang++ -stdlib=libc++
> -I/opt/local/include -g -O2... no, std iostream
> :info:configure configure: error: C++ compiler not available, see
> config.log for details
> :info:configure Command failed:  cd
> "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_devel_gmp/gmp/work/gmp-6.1.2"
> && ./configure --prefix=/opt/local --enable-cxx
> :info:configure Exit code: 1

New description:

 The following message is received when trying to build gmp on Sierra with
 Xcode 9.0:
 {{{
 --->  Configuring gmp
 Error: Failed to configure gmp, consult
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_devel_gmp/gmp/work/gmp-6.1.2/config.log
 }}}
 I will attach the whole log for reference, but the last lines of the log
 file indicate an issue with clang++:
 {{{
 :info:configure checking whether we are using the GNU C++ compiler... yes
 :info:configure checking whether /usr/bin/clang++ -stdlib=libc++ accepts
 -g... yes
 :info:configure checking C++ compiler /usr/bin/clang++ -stdlib=libc++
 -I/opt/local/include -O2 -pedantic -fomit-frame-pointer -m64
 -mtune=sandybridge -march=sandybridge... no, std iostream
 :info:configure checking C++ compiler /usr/bin/clang++ -stdlib=libc++
 -I/opt/local/include -g -O2... no, std iostream
 :info:configure configure: error: C++ compiler not available, see
 config.log for details
 :info:configure Command failed:  cd
 "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_devel_gmp/gmp/work/gmp-6.1.2"
 && ./configure --prefix=/opt/local --enable-cxx
 :info:configure Exit code: 1
 }}}

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Ticket URL: <https://trac.macports.org/ticket/55005#comment:2>
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