[MacPorts] #55733: lz4 fails to build on Snow Leopard

[MacPorts]

#55733: lz4 fails to build on Snow Leopard
---------------------------------------+-------------------
 Reporter:  grumpybozo                 |      Owner:
     Type:  defect                     |     Status:  new
 Priority:  Normal                     |  Milestone:
Component:  ports                      |    Version:  2.4.2
 Keywords:  haspatch snowleopard i386  |       Port:  lz4
---------------------------------------+-------------------
 Errors are typical of missing C++11 support, even on a system where libcxx
 is installed and the procedure at
 https://trac.macports.org/wiki/LibcxxOnOlderSystems has been followed. A
 snippet:


 {{{
 make[1]: Entering directory
 `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_archivers_lz4/lz4/work/lz4-1.8.1.2/contrib/gen_manual'
 /opt/local/bin/clang++-mp-5.0 -arch i386  -O3 -Wall -Wextra -Wcast-qual
 -Wcast-align -Wshadow -Wstrict-aliasing=1 -Wswitch-enum -Wno-comment
 gen_manual.cpp -o gen_manual
 Undefined symbols for architecture i386:
   "std::ctype<char>::_M_widen_init() const", referenced from:
       print_line(std::__cxx11::basic_stringstream<char,
 std::char_traits<char>, std::allocator<char> >&,
 std::__cxx11::basic_string<char, std::char_traits<char>,
 std::allocator<char> >) in gen_manual-327bb0.o
       _main in gen_manual-327bb0.o
   "std::__cxx11::basic_string<char, std::char_traits<char>,
 std::allocator<char> >::find_last_not_of(char const*, unsigned long,
 unsigned long) const", referenced from:
       trim(std::__cxx11::basic_string<char, std::char_traits<char>,
 std::allocator<char> >&, std::__cxx11::basic_string<char,
 std::char_traits<char>, std::allocator<char> >) in gen_manual-327bb0.o
   "std::__cxx11::basic_string<char, std::char_traits<char>,
 std::allocator<char> >::find_first_not_of(char const*, unsigned long,
 unsigned long) const", referenced from:
       trim(std::__cxx11::basic_string<char, std::char_traits<char>,
 std::allocator<char> >&, std::__cxx11::basic_string<char,
 std::char_traits<char>, std::allocator<char> >) in gen_manual-327bb0.o
   "std::__cxx11::basic_string<char, std::char_traits<char>,
 std::allocator<char> >::find(char const*, unsigned long, unsigned long)
 const", referenced from:

 }}}

 This is solved by adding these lines to the Portfile:


 {{{
 depends_lib-append   lib:libc++.1:libcxx
 configure.cxxflags   -stdlib=libc++
 configure.cxx        clang++ -stdlib=libc++
 }}}

--
Ticket URL: <https://trac.macports.org/ticket/55733>
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