[MacPorts] #67355: Compiling hdf5 with +gcc12

[MacPorts]

#67355: Compiling hdf5 with +gcc12
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  Reporter:  jvianalopes  |      Owner:  eborisch
      Type:  defect       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  hdf5         |
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Comment (by jvianalopes):

 Hi,

 I think this option is root of my problem.
 In gcc12, using the -stdlib=libc++, deactivates the c++17 and as a
 consequence in my code I have the error:

 error: 'cyl_bessel_j' is not a member of 'std'

 Compiling my code with -stdlib=libstdc++ works fine until the linking with
 hdf5.
 If hdf5 was compiled with -stdlib=libc++ it is not able to link because
 the symbols are different.
 Compiling hdf5 with -stdlib=libstdc++  it links without problems.

 These options is set in the CXXFLAGS. Editing the PortFile with port edit,

 configure.cxx_stdlib libstdc++

 Doesn't change the CXXFLAGS variable (Checked with sudo port configure
 hdf5 +gcc12 +cxx ;  port logfile hdf5).
 I don't know how to change CXXFLAGS with MacPorts.
 Thanks in advance

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Ticket URL: <https://trac.macports.org/ticket/67355#comment:6>
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