[Bug 219297] cad/freehdl: fails to build with lang/gcc6 or later

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219297

            Bug ID: 219297
           Summary: cad/freehdl: fails to build with lang/gcc6 or later
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Keywords: needs-patch
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: jbeich at FreeBSD.org
                CC: gerald at FreeBSD.org, kamikaze at bsdforen.de
            Blocks: 219275
                CC: gerald at FreeBSD.org, kamikaze at bsdforen.de
             Flags: maintainer-feedback?(kamikaze at bsdforen.de)

v2cc-expr.cc: In function 'bool m_emit_expr(pIIR_AbstractLiteralExpression,
std::__cxx11::string&, RegionStack&, id_type)':
v2cc-expr.cc:605:46: error: call of overloaded 'to_string(double&)' is
ambiguous
  to_string (folded_value(ale).double_value ());
                                              ^
In file included from v2cc-expr.cc:18:0:
v2cc-util.h:246:1: note: candidate: std::__cxx11::string to_string(T) [with T =
double; std::__cxx11::string = std::__cxx11::basic_string<char>]
 to_string(T i)
 ^~~~~~~~~
v2cc-util.h:254:1: note: candidate: std::__cxx11::string to_string(double)
 to_string(double i)
 ^~~~~~~~~
In file included from /usr/local/lib/gcc6/include/c++/string:52:0,
                 from /usr/local/lib/gcc6/include/c++/bits/locale_classes.h:40,
                 from /usr/local/lib/gcc6/include/c++/bits/ios_base.h:41,
                 from /usr/local/lib/gcc6/include/c++/ios:42,
                 from /usr/local/lib/gcc6/include/c++/ostream:38,
                 from /usr/local/lib/gcc6/include/c++/iostream:39,
                 from ../freehdl/fire-types.h:6,
                 from ../freehdl/fire.h:4,
                 from ../freehdl/vaul-chunk.h:6,
                 from ../freehdl/vaul-lexer.h:27,
                 from ../freehdl/vaul-dfile.h:27,
                 from ../freehdl/vaul.h:8,
                 from v2cc-expr.cc:15:
/usr/local/lib/gcc6/include/c++/bits/basic_string.h:5507:3: note: candidate:
std::__cxx11::string std::__cxx11::to_string(long double)
   to_string(long double __val)
   ^~~~~~~~~
/usr/local/lib/gcc6/include/c++/bits/basic_string.h:5498:3: note: candidate:
std::__cxx11::string std::__cxx11::to_string(double)
   to_string(double __val)
   ^~~~~~~~~
/usr/local/lib/gcc6/include/c++/bits/basic_string.h:5489:3: note: candidate:
std::__cxx11::string std::__cxx11::to_string(float)
   to_string(float __val)
   ^~~~~~~~~
/usr/local/lib/gcc6/include/c++/bits/basic_string.h:5483:3: note: candidate:
std::__cxx11::string std::__cxx11::to_string(long long unsigned int)
   to_string(unsigned long long __val)
   ^~~~~~~~~
/usr/local/lib/gcc6/include/c++/bits/basic_string.h:5477:3: note: candidate:
std::__cxx11::string std::__cxx11::to_string(long long int)
   to_string(long long __val)
   ^~~~~~~~~
/usr/local/lib/gcc6/include/c++/bits/basic_string.h:5471:3: note: candidate:
std::__cxx11::string std::__cxx11::to_string(long unsigned int)
   to_string(unsigned long __val)
   ^~~~~~~~~
/usr/local/lib/gcc6/include/c++/bits/basic_string.h:5466:3: note: candidate:
std::__cxx11::string std::__cxx11::to_string(long int)
   to_string(long __val)
   ^~~~~~~~~
/usr/local/lib/gcc6/include/c++/bits/basic_string.h:5460:3: note: candidate:
std::__cxx11::string std::__cxx11::to_string(unsigned int)
   to_string(unsigned __val)
   ^~~~~~~~~
/usr/local/lib/gcc6/include/c++/bits/basic_string.h:5455:3: note: candidate:
std::__cxx11::string std::__cxx11::to_string(int)
   to_string(int __val)
   ^~~~~~~~~

build log: http://sprunge.us/BEKc


Referenced Bugs:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219275
[Bug 219275] [exp-run] Update GCC_DEFAULT from 5 to 6
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