cmake BOOST_STACKTRACE_HAS_BACKTRACE examples

nanocurrency/nano-node CMakeLists.txt :509 

elseif(BOOST_STACKTRACE_HAS_BACKTRACE)

Jackarain/proxy third_party/boost/libs/stacktrace/CMakeLists.txt :80 

option(BOOST_STACKTRACE_ENABLE_BACKTRACE "Boost.Stacktrace: build boost_stacktrace_backtrace" ${BOOST_STACKTRACE_HAS_BACKTRACE})

boostorg/stacktrace CMakeLists.txt :80 

option(BOOST_STACKTRACE_ENABLE_BACKTRACE "Boost.Stacktrace: build boost_stacktrace_backtrace" ${BOOST_STACKTRACE_HAS_BACKTRACE})