[cmake] Add ENABLE_WERROR option (#4080)

Should warnings be errors? that's a philosophical debate which I can only answer with "no, but if you think otherwise here is an option for you"

Signed-off-by: lizzie <lizzie@eden-emu.dev>

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4080
Reviewed-by: crueter <crueter@eden-emu.dev>
Reviewed-by: MaranBr <maranbr@eden-emu.dev>

10 files changed, 43 insertions, 15 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1039ddfed4..8085604de2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -79,6 +79,7 @@ set(YUZU_QT_MIRROR "" CACHE STRING "What mirror to use for downloading the bundl
 cmake_dependent_option(YUZU_USE_BUNDLED_QT "Download bundled Qt binaries" "${MSVC}" "ENABLE_QT" OFF)
 
 option(ENABLE_DEBUG_TOOLS "Enable debugging tools (maxwell disassembler, SPIRV translator, etc)" OFF)
+option(ENABLE_WERROR "Enable -Werror diagnostics" ON)
 
 # non-linux bundled qt are static
 if (YUZU_USE_BUNDLED_QT AND (APPLE OR NOT UNIX))
@@ -157,6 +158,19 @@ if (CXX_CLANG_CL)
         $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-reserved-identifier>
         $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-deprecated-declarations>
         $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-cast-function-type-mismatch>
+        $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-c99-extensions>
+        $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-c++17-compat>
+        $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-c++11-compat-reserved-user-defined-literal>
+        $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-c++11-compat-deprecated-writable-strings>
+        $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-c++11-compat-pedantic>
+        $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-c++11-compat>
+        $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-c++0x-compat>
+        $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-c++98-c++11-compat-binary-literal>
+        $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-c++98-compat-pedantic>
+        $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-c++98-compat>
+        $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-c99-compat>
+        $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-c98-compat>
+        $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-c99-extensions>
         $<$<COMPILE_LANGUAGE:C,CXX>:/EHsc>)
     # REQUIRED CPU features IN Windows-amd64
     if (ARCHITECTURE_x86_64)
diff --git a/docs/Options.md b/docs/Options.md
index bd353b16ca..a8552f2f0f 100644
--- a/docs/Options.md
+++ b/docs/Options.md
@@ -46,6 +46,8 @@ These options control dependencies.
 - `YUZU_INSTALL_UDEV_RULES` (OFF) Install udev rules to enable hidraw access
   - Needed for gyroscopes
   - Only available on Linux
+- `ENABLE_DEBUG_TOOLS` (OFF) Enables debugging and development tools, see [tools](../tools/README.md).
+- `ENABLE_WERROR` (ON) Enables warnings as errors (-Werror).
 
 ### Flavors
 
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index a6d526c5eb..882aff70f0 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -155,12 +155,24 @@ else()
             $<$<COMPILE_LANGUAGE:CXX>:-fno-rtti>)
     endif()
 
+    if (ENABLE_WERROR)
+        add_compile_options(
+            $<$<COMPILE_LANGUAGE:C,CXX>:-Werror=all>
+            $<$<COMPILE_LANGUAGE:C,CXX>:-Werror=extra>
+            $<$<COMPILE_LANGUAGE:C,CXX>:-Werror=missing-declarations>
+            $<$<COMPILE_LANGUAGE:C,CXX>:-Werror=shadow>
+            $<$<COMPILE_LANGUAGE:C,CXX>:-Werror=unused>)
+    else()
+        add_compile_options(
+            $<$<COMPILE_LANGUAGE:C,CXX>:-Wall>
+            $<$<COMPILE_LANGUAGE:C,CXX>:-Wextra>
+            $<$<COMPILE_LANGUAGE:C,CXX>:-Wmissing-declarations>
+            $<$<COMPILE_LANGUAGE:C,CXX>:-Wshadow>
+            $<$<COMPILE_LANGUAGE:C,CXX>:-Wunused>
+            # Some compilers could particularly misbehave :)
+            $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-error-all>)
+    endif()
     add_compile_options(
-        $<$<COMPILE_LANGUAGE:C,CXX>:-Werror=all>
-        $<$<COMPILE_LANGUAGE:C,CXX>:-Werror=extra>
-        $<$<COMPILE_LANGUAGE:C,CXX>:-Werror=missing-declarations>
-        $<$<COMPILE_LANGUAGE:C,CXX>:-Werror=shadow>
-        $<$<COMPILE_LANGUAGE:C,CXX>:-Werror=unused>
         $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-attributes>
         $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-invalid-offsetof>
         $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-unused-parameter>
@@ -169,9 +181,9 @@ else()
     if (CXX_CLANG OR CXX_ICC OR CXX_APPLE) # Clang, AppleClang, or Intel C++
         if (NOT MSVC)
             add_compile_options(
-                $<$<COMPILE_LANGUAGE:C,CXX>:-Werror=shadow-uncaptured-local>
-                $<$<COMPILE_LANGUAGE:C,CXX>:-Werror=implicit-fallthrough>
-                $<$<COMPILE_LANGUAGE:C,CXX>:-Werror=type-limits>)
+                $<$<COMPILE_LANGUAGE:C,CXX>:-Wshadow-uncaptured-local>
+                $<$<COMPILE_LANGUAGE:C,CXX>:-Wimplicit-fallthrough>
+                $<$<COMPILE_LANGUAGE:C,CXX>:-Wtype-limits>)
         endif()
         add_compile_options(
             $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-braced-scalar-init>
diff --git a/src/audio_core/CMakeLists.txt b/src/audio_core/CMakeLists.txt
index 4d0b130afc..b186edaab4 100644
--- a/src/audio_core/CMakeLists.txt
+++ b/src/audio_core/CMakeLists.txt
@@ -222,7 +222,7 @@ if (MSVC)
     )
 else()
     target_compile_options(audio_core PRIVATE
-        $<$<COMPILE_LANGUAGE:C,CXX>:-Werror=conversion>
+        $<$<COMPILE_LANGUAGE:C,CXX>:-Wconversion>
         $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-sign-conversion>)
 endif()
 
diff --git a/src/common/CMakeLists.txt b/src/common/CMakeLists.txt
index 923d001442..10e8cd0cc7 100644
--- a/src/common/CMakeLists.txt
+++ b/src/common/CMakeLists.txt
@@ -220,7 +220,7 @@ endif()
 if(CXX_CLANG)
     target_compile_options(common PRIVATE
         $<$<COMPILE_LANGUAGE:C,CXX>:-fsized-deallocation>
-        $<$<COMPILE_LANGUAGE:C,CXX>:-Werror=unreachable-code-aggressive>)
+        $<$<COMPILE_LANGUAGE:C,CXX>:-Wunreachable-code-aggressive>)
     target_compile_definitions(
         common
         PRIVATE
diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index 16806ff0c0..8e01a67c20 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -1199,7 +1199,7 @@ if (MSVC)
     )
 else()
     target_compile_options(core PRIVATE
-        $<$<COMPILE_LANGUAGE:C,CXX>:-Werror=conversion>
+        $<$<COMPILE_LANGUAGE:C,CXX>:-Wconversion>
         $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-sign-conversion>
         $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-cast-function-type>
         $<$<CXX_COMPILER_ID:Clang>:-fsized-deallocation>)
diff --git a/src/hid_core/CMakeLists.txt b/src/hid_core/CMakeLists.txt
index c740cdbe7f..e617160834 100644
--- a/src/hid_core/CMakeLists.txt
+++ b/src/hid_core/CMakeLists.txt
@@ -151,7 +151,7 @@ if (MSVC)
     )
 else()
     target_compile_options(hid_core PRIVATE
-        $<$<COMPILE_LANGUAGE:C,CXX>:-Werror=conversion>
+        $<$<COMPILE_LANGUAGE:C,CXX>:-Wconversion>
         $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-sign-conversion>
         $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-cast-function-type>
         $<$<CXX_COMPILER_ID:Clang>:-fsized-deallocation>)
diff --git a/src/input_common/CMakeLists.txt b/src/input_common/CMakeLists.txt
index 91dd8558ab..840602f4ce 100644
--- a/src/input_common/CMakeLists.txt
+++ b/src/input_common/CMakeLists.txt
@@ -44,7 +44,7 @@ if (MSVC)
         /we4800 # Implicit conversion from 'type' to bool. Possible information loss
     )
 else()
-    target_compile_options(input_common PRIVATE $<$<COMPILE_LANGUAGE:C,CXX>:-Werror=conversion>)
+    target_compile_options(input_common PRIVATE $<$<COMPILE_LANGUAGE:C,CXX>:-Wconversion>)
 endif()
 
 if (ANDROID)
diff --git a/src/shader_recompiler/CMakeLists.txt b/src/shader_recompiler/CMakeLists.txt
index d02ee268f0..1e6a4d173a 100644
--- a/src/shader_recompiler/CMakeLists.txt
+++ b/src/shader_recompiler/CMakeLists.txt
@@ -253,7 +253,7 @@ if (MSVC)
     )
 else()
     target_compile_options(shader_recompiler PRIVATE
-        $<$<COMPILE_LANGUAGE:C,CXX>:-Werror=conversion>
+        $<$<COMPILE_LANGUAGE:C,CXX>:-Wconversion>
         # Bracket depth determines maximum size of a fold expression in Clang since 9c9974c3ccb6.
         # And this in turns limits the size of a std::array.
         $<$<CXX_COMPILER_ID:Clang>:-fbracket-depth=1024>
diff --git a/src/video_core/CMakeLists.txt b/src/video_core/CMakeLists.txt
index aba602c3b3..6720195c0e 100644
--- a/src/video_core/CMakeLists.txt
+++ b/src/video_core/CMakeLists.txt
@@ -373,7 +373,7 @@ else()
             $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-shadow>
             $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-unused-local-typedef>)
     else()
-        target_compile_options(video_core PRIVATE $<$<COMPILE_LANGUAGE:C,CXX>:-Werror=conversion>)
+        target_compile_options(video_core PRIVATE $<$<COMPILE_LANGUAGE:C,CXX>:-Wconversion>)
     endif()
 
     target_compile_options(video_core PRIVATE $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-sign-conversion>)