[MacPorts] #50304: libcxx @3.7.0 +universal compile error on MacOS 10.6.8 - build failure

[MacPorts]

#50304: libcxx @3.7.0 +universal compile error on MacOS 10.6.8 - build failure
---------------------------+--------------------------------
 Reporter:  cf-macports@…  |      Owner:  macports-tickets@…
     Type:  defect         |     Status:  new
 Priority:  Normal         |  Milestone:
Component:  ports          |    Version:  2.3.4
 Keywords:                 |       Port:  libcxx
---------------------------+--------------------------------
 Trying to build libcxx @3.7.0 with mp-clang 3.8 on MacOS 10.6.8 and Xcode
 Version 3.2.6 (1761). I run into the following compilation error:

 {{{
 --->  Building libcxx
 + for FILE in '../src/*.cpp'
 + /opt/local/bin/clang++-mp-3.8 -c -g -Os -arch x86_64 -arch i386
 -nostdinc++ -std=c++11 -U__STRICT_ANSI__ -I../include ../src/algorithm.cpp
 In file included from ../src/algorithm.cpp:11:
 lofwyr:files chris$ m ../include/random:1645:
 ../include/string:1938:44: error: 'basic_string<_CharT, _Traits,
 _Allocator>' is missing exception specification
 'noexcept(is_nothrow_copy_constructible<allocator_type>::value)'
 basic_string<_CharT, _Traits, _Allocator>::basic_string(const
 allocator_type& __a)
                                            ^
 ../include/string:1326:40: note: previous declaration is here
     _LIBCPP_INLINE_VISIBILITY explicit basic_string(const allocator_type&
 __a)
                                        ^
 1 error generated.
 Command failed:  cd
 "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_lang_libcxx/libcxx/work/libcxx-3.7.0.src/lib"
 && ./buildit all
 Exit code: 1
 Error: org.macports.build for port libcxx returned: command execution
 failed
 }}}

 As far as I can tell, the second declaration (line 1938) is missing the
 exception declaration from the first one (line 1326). Adding the
 declaration fixes the compilation issue and the port builds correctly. I
 attached diff files of the changes I made.

-- 
Ticket URL: <https://trac.macports.org/ticket/50304>
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