Add automatic sccache/ccache detection to CMake and remove deprecated Ninja setup action (#734)

* remove outdated ninja setup action

* Remove deprecated ninja setup action

The seanmiddleditch/gha-setup-ninja action has been archived by its
maintainer, who explicitly states that Ninja is now pre-installed on
all GitHub-hosted runners. This removes the action from all three
build jobs (Windows, macOS, Linux) and removes ninja from the package
install lists on macOS and Linux.

* Add automatic ccache/sccache detection to CMakeLists.txt

Detects sccache (preferred on Windows/MSVC) or ccache at configure time
and sets CMAKE_C_COMPILER_LAUNCHER / CMAKE_CXX_COMPILER_LAUNCHER
automatically. Works for local builds without manual flags.

Priority: sccache > ccache (sccache handles MSVC PDBs better).

* Delete github-actions-version-research.md

* Respect user-specified CMAKE_C_COMPILER_LAUNCHER / CMAKE_CXX_COMPILER_LAUNCHER

Only auto-detect sccache/ccache if no launcher was explicitly provided
via -DCMAKE_C_COMPILER_LAUNCHER=... or -DCMAKE_CXX_COMPILER_LAUNCHER=...

* Preserve explicit compiler launcher settings per language

---------

Co-authored-by: nmzik <Nmzik@mail.ru>

.github/workflows/build.yml

@@ -43,9 +43,6 @@ jobs:
       - name: Setup Visual Studio environment
         uses: ilammy/msvc-dev-cmd@v1
 
-      - name: Setup Ninja
-        uses: seanmiddleditch/gha-setup-ninja@v5
-
       - name: Locate vcpkg
         id: vcpkg
         shell: pwsh
@@ -155,7 +152,7 @@ jobs:
 
       - name: Install build dependencies
         shell: bash
-        run: brew install glslang ninja
+        run: brew install glslang
 
       - name: Install Qt 6.10.3
         uses: jurplel/install-qt-action@v4
@@ -318,7 +315,6 @@ jobs:
             libxrandr-dev \
             libxss-dev \
             lld \
-            ninja-build \
             pkg-config \
             wayland-protocols
 

CMakeLists.txt

@@ -12,6 +12,22 @@ endif()
 
 project(Kyty)
 
+find_program(SCCACHE_PROGRAM sccache)
+find_program(CCACHE_PROGRAM ccache)
+
+foreach(lang IN ITEMS C CXX)
+    # An explicitly empty launcher disables caching for this language.
+    if(NOT DEFINED CMAKE_${lang}_COMPILER_LAUNCHER)
+        if(SCCACHE_PROGRAM)
+            set(CMAKE_${lang}_COMPILER_LAUNCHER "${SCCACHE_PROGRAM}")
+            message(STATUS "sccache enabled for ${lang}: ${SCCACHE_PROGRAM}")
+        elseif(CCACHE_PROGRAM)
+            set(CMAKE_${lang}_COMPILER_LAUNCHER "${CCACHE_PROGRAM}")
+            message(STATUS "ccache enabled for ${lang}: ${CCACHE_PROGRAM}")
+        endif()
+    endif()
+endforeach()
+
 set(KYTY_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/src")
 set(KYTY_TESTS_DIR "${CMAKE_CURRENT_SOURCE_DIR}/tests")
 set(KYTY_THIRD_PARTY_DIR "${CMAKE_CURRENT_SOURCE_DIR}/3rdparty")