Improve build

danielaparker · Jan 15, 2021 · e27faef · e27faef
1 parent 3117e91
commit e27faef
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Showing 2 changed files with 9 additions and 2 deletions.
diff --git a/CMakeLists.txt b/CMakeLists.txt
@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.1)
 
-project(jsoncons)
+project(jsoncons CXX)
 
 set(JSONCONS_PROJECT_DIR ${PROJECT_SOURCE_DIR})
 set(JSONCONS_INCLUDE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/include)

diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
@@ -164,9 +164,16 @@ target_compile_features(unit_tests INTERFACE cxx_std_11)
 
 target_compile_options(unit_tests PRIVATE
     $<$<CXX_COMPILER_ID:MSVC>: /EHsc /MP /bigobj /W4>
-    $<$<CXX_COMPILER_ID:GNU>:-Werror -Wall -Wextra -Wimplicit-fallthrough -pedantic -Wcast-align -Wcast-qual>
+    $<$<CXX_COMPILER_ID:GNU>:-Werror -Wall -Wextra -pedantic -Wcast-align -Wcast-qual>
 )
 
+check_cxx_compiler_flag("${implicit-fallthrough}" ${implicit-fallthrough-name})
+if(${implicit-fallthrough-name})
+    message(STATUS "implicit-fallthrough") 
+    target_compile_options(unit_tests PRIVATE
+                           $<$<CXX_COMPILER_ID:GNU>:-Wimplicit-fallthrough>
+endif()
+
 if (NOT CMAKE_SYSTEM_NAME STREQUAL Windows)
 target_compile_options(unit_tests PRIVATE
     $<$<CXX_COMPILER_ID:Clang>:-Werror -Wall -Wextra -Wimplicit-fallthrough -Wcast-align -Wcast-qual>