[MacPorts] #48089: GASNet @1.24.0_0: build fails due to wrong CXX

[MacPorts]

#48089: GASNet @1.24.0_0: build fails due to wrong CXX
----------------------+-----------------------
 Reporter:  larryv@…  |      Owner:  takeshi@…
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:  2.3.3
 Keywords:  haspatch  |       Port:  GASNet
----------------------+-----------------------
 {{{
 :info:build /opt/local/bin/ccache /usr/bin/clang++  -O3 -Wno-unused-value
 -Wno-empty-body -Wstrict-prototypes    -L/opt/local/lib
 -Wl,-headerpad_max_install_names -Wl,-multiply_defined,suppress
 -Wl,-no_pie   -I. -I./.. -DAMUDP_NDEBUG=1 -DSIZEOF_CHAR=1 -DSIZEOF_SHORT=2
 -DSIZEOF_INT=4 -DSIZEOF_LONG=8 -DSIZEOF_LONG_LONG=8 -DSIZEOF_VOID_P=8
 -DHAVE_STDINT_H -DCOMPLETE_STDINT_H -DHAVE_INTTYPES_H
 -DCOMPLETE_INTTYPES_H -DHAVE_SYS_TYPES_H -DAMUDP_ENV_PREFIX=GASNET
 -I./../.. -I../.. -DHAVE_GASNET_TOOLS  -o amudprun amudprun.o -L. -lamudp
 -L../.. -lgasnet_tools-seq    -lgcc_eh
 :info:build ld: library not found for -lgcc_eh
 }}}

 Looks like the build should be using `mpicxx`, but it isn’t.
 {{{
 :debug:configure Environment:
 CC='ccache /opt/local/bin/mpicc-mpich-gcc5'
 [...]
 CXX='ccache /usr/bin/clang++'
 [...]
 :info:configure checking for C++ compiler family... Clang
 :info:configure configure: WARNING: The compiler families of $CC and $CXX
 do not match:
 :info:configure       CC:  COMPILER_FAMILY:GNU  COMPILER_VERSION:5.1.0
 :info:configure      CXX:  COMPILER_FAMILY:CLANG
 COMPILER_VERSION:6.1.0 (clang-602.0.53)
 :info:configure If this is not what you intended, then set $CXX to select
 a different C++ compiler.
 }}}

 The [[attachment:GASNet.patch|attached patch]] fixes the build for me, but
 I’m not sure that it doesn’t have any unintended side-effects. The
 `compilers-1.0` and `mpi-1.0` portgroups are quite opaque.

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Ticket URL: <https://trac.macports.org/ticket/48089>
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