Merge pull request dropbox#72 from admsyn/feature-cmake-dr1467-canary

Add cmake option for DR1467 canary tests

CMakeLists.txt

@@ -4,6 +4,7 @@ project(json11 VERSION 1.0.0 LANGUAGES CXX)
 enable_testing()
 
 option(JSON11_BUILD_TESTS "Build unit tests" ON)
+option(JSON11_ENABLE_DR1467_CANARY "Enable canary test for DR 1467" OFF)
 
 set(CMAKE_CXX_STANDARD 11)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
@@ -16,6 +17,14 @@ target_compile_options(json11
 configure_file("json11.pc.in" "json11.pc" @ONLY)
 
 if (JSON11_BUILD_TESTS)
+
+  # enable test for DR1467, described here: https://llvm.org/bugs/show_bug.cgi?id=23812
+  if(JSON11_ENABLE_DR1467_CANARY)
+    add_definitions(-D JSON11_ENABLE_DR1467_CANARY=1)
+  else()
+    add_definitions(-D JSON11_ENABLE_DR1467_CANARY=0)
+  endif()
+
   add_executable(json11_test test.cpp)
   target_link_libraries(json11_test json11)
 endif()