[MacPorts] #42500: Move cctools-headers, dyld-headers, libunwind-headers

[MacPorts]

#42500: Move cctools-headers, dyld-headers, libunwind-headers
-------------------------------------------------+-------------------------
  Reporter:  mfeiri@…                            |      Owner:  jeremyhu@…
      Type:  enhancement                         |     Status:  new
  Priority:  Normal                              |  Milestone:
 Component:  ports                               |    Version:  2.2.1
Resolution:                                      |   Keywords:
      Port:  cctools-headers, dyld-headers,      |
  ld64, libcxxabi                                |
-------------------------------------------------+-------------------------
Changes (by mfeiri@…):

 * port:  cctools-headers, dyld-headers, libunwind-headers, ld64, libcxxabi
     => cctools-headers, dyld-headers, ld64, libcxxabi


Comment:

 I just moved the destroot of libunwind-headers to DarwinX.sdk in r127042.
 This might break libcxxabi and ld64 on darwin <=9, but resolves the build
 conflict indicated in #43869. To fix this issue, add either "{{{-I
 ${destroot}${prefix}/Developer/SDKs/Darwin${os.major}.sdk/usr/include/}}}"
 or "{{{-isysroot ${destroot}${prefix}/Developer/SDKs/Darwin${os.major}.sdk
 --sysroot /}}}" to the cflags on darwin <=9.

 Please move the remaining cctools-headers and dyld-headers ports to
 DarwinX.sdk as well. As it turned out, some ports can not handle the
 presence of system SDK headers in regular include directories.

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Ticket URL: <https://trac.macports.org/ticket/42500#comment:3>
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