[MacPorts] #57403: ROOT 6 compilation via cling fails

[MacPorts]

#57403: ROOT 6 compilation via cling fails
----------------------+--------------------------
 Reporter:  hansgans  |      Owner:  cjones051073
     Type:  defect    |     Status:  assigned
 Priority:  High      |  Milestone:
Component:  ports     |    Version:
 Keywords:  mojave    |       Port:  root6
----------------------+--------------------------
 After updating to macOS10.14 (and reinstalling all ports) I cannot compile
 my ROOT macros anymore (interpreting does still work, as far as I see).
 Compiling a simple macro e.g.:

 {{{
 #include "TROOT.h"
 #include <iostream>

 void test() {
   std::cout<<"adsf"<<std::endl;
 }
 }}}
 using {{{root test.C+}}} fails with various `unknown type errors`:

 {{{
 Processing test.C+...
 Info in <TMacOSXSystem::ACLiC>: creating shared library
 /Users/me/Desktop/./test_C.so
 warning: no such sysroot directory: '-I/opt/local/libexec/root6/etc/root'
 In file included from input_line_1:1:
 In file included from
 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/new:91:
 In file included from
 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/exception:82:
 In file included from
 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/cstdlib:86:
 In file included from
 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/stdlib.h:94:
 /opt/local/libexec/root6/etc/root/cling/lib/clang/5.0.0/include/stdlib.h:8:15:
 fatal error: 'stdlib.h' file not found
 #include_next <stdlib.h>
               ^~~~~~~~~~
 In file included from input_line_3:1:
 In file included from
 /opt/local/libexec/root6/include/root/RtypesCore.h:25:
 In file included from
 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/stddef.h:46:
 /opt/local/libexec/root6/etc/root/cling/lib/clang/5.0.0/include/stddef.h:51:9:
 error: unknown type name '__PTRDIFF_TYPE__'
 typedef __PTRDIFF_TYPE__ ptrdiff_t;
 }}}

 ROOT seems to use header files for clang5 while AppleClang is currently at
 version 10.0. The full log file is attached.

-- 
Ticket URL: <https://trac.macports.org/ticket/57403>
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