[MacPorts] #69067: libgcc* ports apparently do not need +stdlib_flag variants, it does nothing

[MacPorts]

#69067: libgcc* ports apparently do not need +stdlib_flag variants, it does nothing
-------------------------+-------------------------------------------------
 Reporter:               |      Owner:  (none)
  barracuda156           |
     Type:  defect       |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.8.1
 Keywords:               |       Port:  libgcc10, libgcc11, libgcc12,
                         |  libgcc13
-------------------------+-------------------------------------------------
 While gcc* use `+stdlib_flag` to be able to use `libc++` headers, for
 libgcc* it is apparently redundant and does nothing.

 If that is indeed the case, the following chunk is wrong:
 {{{
 if { ${subport} ne ${libcxxname} } {

     variant stdlib_flag description {Enable stdlib command line flag to
 select c++ runtime} {
         # Enables support for specifying the c++ runtime via `-stdlib=` in
 a similar
         # way to clang. For more details see the later comments in
         #   https://www.mail-archive.com/gcc-
 patches at gcc.gnu.org/msg257385.html
         # Note : This 'bakes' the libc++ include directory into gcc,
         # which is then used as the default search location when
 `-stdlib=libc++`
         # is given. Therefore to have consistency across various OS
 versions, and to enable
         # modern c++ standards, use a recent macports clang port to
 provide this.
         if {${subport} eq ${name}} {
             depends_run-append port:${libcxxname}
         }
         configure.args-append --with-gxx-libcxx-include-
 dir="${libcxx_incpath}"
     }

     # libcxx may not be fully functional on PowerPC yet.
     if {${build_arch} ni [list ppc ppc64]} {
         default_variants-append +stdlib_flag
     }

 }
 }}}

 And the condition for it should rather be `if { ${subport} eq ${name} }`,
 not `if { ${subport} ne ${libcxxname} }`.

-- 
Ticket URL: <https://trac.macports.org/ticket/69067>
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