Treat warnings as errors

.github/workflows/ci.yml

@@ -94,9 +94,9 @@ jobs:
       - name: print environment
         run: env
       - name: configure
-        run: cmake -S . -B build -DCMAKE_BUILD_TYPE=Release
+        run: cmake -S . -B build -DWERROR=ON -DCMAKE_BUILD_TYPE=Release
       - name: build
-        run: cmake --build build --parallel 3
+        run: cmake --build build --parallel 8
         env:
           CC: ${{ matrix.cc }}
           CXX: ${{ matrix.cxx }}
@@ -157,11 +157,11 @@ jobs:
       - name: print environment
         run: env
       - name: configure
-        run: cmake -S . -B build -DCMAKE_BUILD_TYPE=Release
+        run: cmake -S . -B build -DWERROR=ON -DCMAKE_BUILD_TYPE=Release
         env:
           DEVELOPER_DIR: /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
       - name: build
-        run: cmake --build build --parallel 3 --verbose
+        run: cmake --build build --parallel 8 --verbose
       - name: test
         run: ./build/test/jsonrpcpp_test
 
@@ -195,6 +195,6 @@ jobs:
             -DVCPKG_TARGET_TRIPLET="x64-windows" `
             -DCMAKE_BUILD_TYPE=Release `"
       - name: build
-        run: cmake --build build --config Release --parallel 3 --verbose
+        run: cmake --build build --config Release --parallel 8 --verbose
       - name: test
         run: .\build\test\Release\jsonrpcpp_test.exe

CMakeLists.txt

@@ -18,6 +18,7 @@ set(PROJECT_URL "https://github.com/badaix/jsonrpcpp")
 
 option(BUILD_EXAMPLE "Build example (build jsonrpcpp_example demo)" ON)
 option(BUILD_TESTS "Build tests" ON)
+option(WERROR "Treat warnings as errors" OFF)
 
 set(CMAKE_CXX_STANDARD 11)
 set(CMAKE_CXX_EXTENSIONS OFF)
@@ -35,6 +36,25 @@ include_directories(
 install(FILES include/jsonrpcpp.hpp include/json.hpp
     DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/jsonrpcpp")
 
+if(MSVC)
+    # warning level 4 and all warnings as errors warning C4505: 'getArch':
+    # unreferenced local function has been removed warning C4458: declaration of
+    # 'size' hides class member warning C4459: declaration of 'query' hides global
+    # declaration
+    add_compile_options(/W4 /wd4458 /wd4459 /wd4505)
+    if(WERROR)
+        add_compile_options(/WX)
+    endif()
+else()
+    # lots of warnings and all warnings as errors
+    add_compile_options(-Wall -Wextra -pedantic)
+
+    if(WERROR)
+        add_compile_options(-Werror)
+    endif()
+endif()
+
+
 if (BUILD_EXAMPLE)
 add_subdirectory(example)
 endif (BUILD_EXAMPLE)