Merge #197 'fix link issue with boost_system when statically linked'

Author: paoloambrosio

CHANGELOG.md

@@ -8,6 +8,8 @@ Please see [CONTRIBUTING.md](https://github.com./cucumber/cucumber/blob/master/CO
 
 ### Fixed
 
+* Fix statically linking `boost_system` ([#197](https://github.com./cucumber/cucumber-cpp/pull/197) Matthieu Longo)
+
 ## [0.5](https://github.com./cucumber/cucumber-cpp/compare/v0.4...v0.5) (2 July 2018)
 
 ### Added

CMakeLists.txt

@@ -112,6 +112,11 @@ if(Boost_SYSTEM_LIBRARY AND NOT TARGET Boost::system)
         "IMPORTED_LOCATION" "${Boost_SYSTEM_LIBRARY}"
         "INTERFACE_LINK_LIBRARIES" "Boost::boost"
     )
+    if(Boost_USE_STATIC_LIBS)
+        set_target_properties(Boost::system PROPERTIES
+            "COMPILE_DEFINITIONS" BOOST_ERROR_CODE_HEADER_ONLY=1
+        )
+    endif()
 endif()
 if(Boost_FILESYSTEM_LIBRARY AND NOT TARGET Boost::filesystem)
     add_library(Boost::filesystem ${LIBRARY_TYPE} IMPORTED)