[Bug 214863] lang/gcc + libc++ may fail due to spurious __cxa_throw_bad_array_new_length reference

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214863

            Bug ID: 214863
           Summary: lang/gcc + libc++ may fail due to spurious
                    __cxa_throw_bad_array_new_length reference
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Keywords: regression
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: gerald at FreeBSD.org
          Reporter: jbeich at FreeBSD.org
                CC: freebsd-toolchain at FreeBSD.org
            Blocks: 196712
             Flags: maintainer-feedback?(gerald at FreeBSD.org)
          Assignee: gerald at FreeBSD.org

Bug 196712 regressed USES=compiler:gcc-c++11-lib ports. gcc49 or later appear
to have the following regression on /releng/10.1. Maybe toolchain@ has a clue.

  $ cat a.cc
  int main()
  {
    // Snippet from lilypond-devel
    int argc = 5;
    char **argv = new char*[argc + 2];
    return 0;
  }

  $ pkg install -y gcc libc++
  $ g++49 -std=c++11 -nostdinc++ -isystem /usr/local/include/c++/v1
-L/usr/local/lib/c++ a.cc
  /tmp//ccZYfujU.o: In function `main':
  a.cc:(.text+0x2b): undefined reference to `__cxa_throw_bad_array_new_length'
  collect2: error: ld returned 1 exit status

Affected ports:

  cad/openvsp
  math/ceres-solver
  math/saga
  print/lilypond-devel


Referenced Bugs:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=196712
[Bug 196712] exp-run: Update lang/gcc from GCC 4.8 to GCC 4.9
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