[MacPorts] #71551: nodejs22 @22.12.0_0: error: invalid value 'gnu++20' in '-std=gnu++20'

[MacPorts]

#71551: nodejs22 @22.12.0_0: error: invalid value 'gnu++20' in '-std=gnu++20'
-----------------------+----------------------
  Reporter:  axoide    |      Owner:  ci42
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.10.5
Resolution:            |   Keywords:  mojave
      Port:  nodejs22  |
-----------------------+----------------------

Comment (by jhgorse):

 The node build does not respect the build tools specified by the portfile.

 With this addition to the portfile, we get further, but not quite all the
 way because the it reverts back to /usr/bin/clang++ at some point.
 {{{
 compiler.blacklist-delete *clang*
 compiler.blacklist-append {clang < 1400}
 compiler.fallback-append macports-clang-16
 configure.compiler macports-clang-16
 configure.cxxflags-delete -std=gnu++20
 configure.cxxflags-append -std=gnu++2a

 build.args-append \
     CC=${prefix}/bin/clang-mp-16 \
     CXX=${prefix}/bin/clang++-mp-16 \
     CXX.host=${prefix}/bin/clang++-mp-16 \
     CPP=${prefix}/bin/clang-cpp-mp-16 \
     CFLAGS="${configure.cflags} ${configure.cppflags}" \
     CXXFLAGS="${configure.cxxflags} ${configure.cppflags}" \
     CPPFLAGS="${configure.cppflags}" \
     LDFLAGS="${configure.ldflags} [legacysupport::get_library_link_flags]"
 \
     PYTHON=${configure.python} \
     V=1
 }}}

 Build output showing the wrong clang:
 {{{
   /usr/bin/clang++ -Wno-error=enum-constexpr-conversion -Wno-error
 =unknown-warning-option -o
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_nodejs22/nodejs22/work/node-v22.14.0/out/Release/obj.target/v8_abseil/deps/v8/third_party
 /abseil-cpp/absl/base/internal/raw_logging.o ../deps/v8/third_party
 /abseil-cpp/absl/base/internal/raw_logging.cc '-D_GLIBCXX_USE_CXX11_ABI=1'
 '-DNODE_OPENSSL_CONF_NAME=nodejs_conf' '-DNODE_OPENSSL_HAS_QUIC'
 '-DICU_NO_USER_DATA_OVERRIDE' '-DV8_GYP_BUILD'
 '-DV8_TYPED_ARRAY_MAX_SIZE_IN_HEAP=64' '-DBUILDING_V8_SHARED'
 '-D_DARWIN_USE_64_BIT_INODE=1' '-D_DARWIN_C_SOURCE=1'
 '-DOPENSSL_NO_PINSHARED' '-DOPENSSL_THREADS' '-DV8_TARGET_ARCH_X64'
 '-DV8_HAVE_TARGET_OS' '-DV8_TARGET_OS_MACOS'
 '-DV8_EMBEDDER_STRING="-node.22"' '-DENABLE_DISASSEMBLER'
 '-DV8_PROMISE_INTERNAL_FIELD_COUNT=1' '-DV8_SHORT_BUILTIN_CALLS'
 '-DOBJECT_PRINT' '-DV8_INTL_SUPPORT' '-DV8_ATOMIC_OBJECT_FIELD_WRITES'
 '-DV8_ENABLE_LAZY_SOURCE_POSITIONS' '-DV8_USE_SIPHASH'
 '-DV8_SHARED_RO_HEAP' '-DNDEBUG' '-DV8_WIN64_UNWINDING_INFO'
 '-DV8_ENABLE_REGEXP_INTERPRETER_THREADED_DISPATCH' '-DV8_USE_ZLIB'
 '-DV8_ENABLE_SPARKPLUG' '-DV8_ENABLE_TURBOFAN'
 '-DV8_ENABLE_SYSTEM_INSTRUMENTATION' '-DV8_ENABLE_WEBASSEMBLY'
 '-DV8_ENABLE_JAVASCRIPT_PROMISE_HOOKS'
 '-DV8_ENABLE_CONTINUATION_PRESERVED_EMBEDDER_DATA'
 '-DV8_ALLOCATION_FOLDING' '-DV8_ALLOCATION_SITE_TRACKING'
 '-DV8_ADVANCED_BIGINT_ALGORITHMS'
 -I/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_nodejs22/nodejs22/work
 /zlib-inc -I../deps/v8 -I../deps/v8/include -I../deps/v8/third_party
 /abseil-cpp  -O3 -gdwarf-2 -fno-strict-aliasing -fvisibility=hidden -arch
 x86_64 -Wall -Wendif-labels -W -Wno-unused-parameter -std=gnu++20
 -stdlib=libc++ -fno-rtti -fno-exceptions -Wno-invalid-offsetof -MMD -MF
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_nodejs22/nodejs22/work/node-v22.14.0/out/Release/.deps//opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_nodejs22/nodejs22/work/node-v22.14.0/out/Release/obj.target/v8_abseil/deps/v8/third_party
 /abseil-cpp/absl/base/internal/raw_logging.o.d.raw -I/opt/local/include
 -Os -std=gnu++2a -stdlib=libc++ -I/opt/local/include -c
 }}}

 I'll keep digging. I am on Mac OS 10.14 amd64. Cheers.

-- 
Ticket URL: <https://trac.macports.org/ticket/71551#comment:10>
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