[MacPorts] #67738: py-grpcio: builds fail for 10.9 and earlier: error: invalid argument '-std=c++14' not allowed with 'C'

[MacPorts]

#67738: py-grpcio: builds fail for 10.9 and earlier: error: invalid argument
'-std=c++14' not allowed with 'C'
---------------------+-----------------------
 Reporter:  mascguy  |      Owner:  mascguy
     Type:  defect   |     Status:  assigned
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:  2.8.1
 Keywords:           |       Port:  py-grpcio
---------------------+-----------------------
 This appears to be done by the project's build script(s), but only for
 10.9 and earlier:

 {{{
 /opt/local/bin/clang-mp-16 -Wno-unused-result -Wsign-compare
 -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall
 -pipe -I/opt/local/libexec/openssl11/include -Os -arch x86_64 -isysroot/
 -D_WIN32_WINNT=1536 -DGRPC_XDS_USER_AGENT_NAME_SUFFIX=\"Python\"
 -DGRPC_XDS_USER_AGENT_VERSION_SUFFIX=\"1.48.0\" -DOPENSSL_NO_ASM=1
 -DGPR_BACKWARDS_COMPATIBILITY_MODE=1 -DHAVE_CONFIG_H=1
 -DGRPC_ENABLE_FORK_SUPPORT=1 "-DPyMODINIT_FUNC=extern \"C\"
 __attribute__((visibility (\"default\"))) PyObject*"
 -DGRPC_POSIX_FORK_ALLOW_PTHREAD_ATFORK=1 -Isrc/python/grpcio -Iinclude -I.
 -I/opt/local/include -Ithird_party/address_sorting/include
 -I/opt/local/include -I/opt/local/include/re2 -I/opt/local/include/openssl
 -Ithird_party/upb -Isrc/core/ext/upb-generated
 -Isrc/core/ext/upbdefs-generated -Ithird_party/xxhash -I/opt/local/include
 -I/opt/local/Library/Frameworks/Python.framework/Versions/3.7/include/python3.7m
 -c third_party/address_sorting/address_sorting.c
 -o
 python_build/temp.macosx-10.10-x86_64-cpython-37/third_party/address_sorting/address_sorting.o
 -std=c++14 -stdlib=libc++ -fvisibility=hidden -fno-wrapv -fno-exceptions
 -DHAVE_UNISTD_H -pthread

 clang: warning: argument unused during compilation: '-stdlib=libc++'
 [-Wunused-command-line-argument]
 error: invalid argument '-std=c++14' not allowed with 'C'
 }}}

-- 
Ticket URL: <https://trac.macports.org/ticket/67738>
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