Add a new mkspec variable, QMAKE_LIBS_EXECINFO, for platforms where
backtrace(3), backtrace_symbols(3) and others are not in libc, but
rather in a separate library -- on the BSDs, this is libexecinfo.
Use it in corelib/global/global.pri so that libqt5core links against it
and has the proper dependency when necessary.
Change-Id: I62ac36c9b3ba7ab0719420cb795087d43ec138a4
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
350c60b79e