[MacPorts] #58695: nodejs12 @12.6.0: ld: library not found for -latomic

[MacPorts]

#58695: nodejs12 @12.6.0: ld: library not found for -latomic
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  Reporter:  dubiousjim  |      Owner:  ci42
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  nodejs12    |
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Comment (by ryandesign):

 Replying to [comment:7 dubiousjim]:
 > As I understand it, node is supposed to build on Mac with either gcc or
 clang, but somewhere either in their build toolchain or Macports' (I'm
 guesing the latter) the `-stdlib=libc++` gets added to the compiler
 options, and only clang understands that. So either that has to be changed
 or we have to continue building with clang.

 MacPorts adds the `-stdlib=...` flag to all builds when clang++ is
 selected as the compiler.

 Please do not attempt to build C++ software on macOS using anything other
 than clang++. Do not attempt to use g++. You will encounter no end of
 problems due to mismatched C++ standard libraries.


 > As I said in a previous comment, libatomic files are available on my
 machine, in /opt/local/lib/gcc*. I was able to successfully upgrade
 nodejs12 using this invocation:
 >
 > > sudo port upgrade nodejs12 configure.ldflags="-L/opt/local/lib/gcc8"
 >
 > My grasp of Macports isn't solid enough to know why this should work,
 although it didn't work when I attempted to upgrade using `configure
 .ldflags-append="-L/opt/local/lib/gcc8"`. Are the `-append` variables not
 recognized on the command line? Using that `-append` variable seemed to
 have ''some'' effect though; but perhaps that was an illusion.

 `configure.ldflags` is a variable (well, an "option" in MacPorts base
 parlance). You can override options on the command line to aid in
 debugging. `configure.ldflags-append` is a procedure. You cannot invoke
 procedures on the command line.

 It looks like upstream has
 [https://github.com/nodejs/node/commit/ab3174ca08dcc4a435d61f4ce43e5bfd8cf23115
 fixed this in nodejs13]. We could backport that to earlier versions.

-- 
Ticket URL: <https://trac.macports.org/ticket/58695#comment:10>
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