@@ -19,7 +19,7 @@ jobs:
 
     strategy:
       matrix:
-        image: ["centos:7", "ubuntu:14.04", "ubuntu:16.04", "ubuntu:18.04", "ubuntu:23.04"]
+        image: ["ubuntu:16.04", "ubuntu:18.04", "ubuntu:23.04"]
       fail-fast: false # Prefer quick result
 
     runs-on: ubuntu-22.04
@@ -35,13 +35,6 @@ jobs:
     steps:
       - uses: actions/checkout@v3
 
-      - name: Install missing software on CentOS 7
-        if: matrix.image == 'centos:7'
-        run: |
-          yum install -y cmake gcc-c++ make pcre-devel
-          yum --enablerepo=extras install -y epel-release
-          yum install -y ccache
-
       - name: Install missing software on ubuntu
         if: contains(matrix.image, 'ubuntu')
         run: |
@@ -59,46 +52,36 @@ jobs:
       # - it doesn't support centos
       - name: ccache
         uses: hendrikmuhs/ccache-action@v1.2
-        if: matrix.image != 'ubuntu:14.04' # no support for --set-config
         with:
           key: ${{ github.workflow }}-${{ matrix.image }}
 
-      # tests require CMake 3.9 - no ccache available
-      - name: CMake build (no tests / no ccache)
-        if: matrix.image == 'ubuntu:14.04'
-        run: |
-          mkdir cmake.output
-          cd cmake.output
-          cmake -G "Unix Makefiles" -DHAVE_RULES=On ..
-          cmake --build . -- -j$(nproc)
-
       # tests require CMake 3.9 - ccache available
       - name: CMake build (no tests)
-        if: matrix.image == 'centos:7' || matrix.image == 'ubuntu:16.04'
+        if: matrix.image == 'ubuntu:16.04'
         run: |
           mkdir cmake.output
           cd cmake.output
           cmake -G "Unix Makefiles" -DHAVE_RULES=On -DCMAKE_DISABLE_PRECOMPILE_HEADERS=On -DCMAKE_C_COMPILER_LAUNCHER=ccache -DCMAKE_CXX_COMPILER_LAUNCHER=ccache ..
           cmake --build . -- -j$(nproc)
 
       - name: CMake build
-        if: matrix.image != 'centos:7' && matrix.image != 'ubuntu:14.04' && matrix.image != 'ubuntu:16.04'
+        if: matrix.image != 'ubuntu:16.04'
         run: |
           mkdir cmake.output
           cd cmake.output
           cmake -G "Unix Makefiles" -DHAVE_RULES=On -DBUILD_TESTS=On -DCMAKE_DISABLE_PRECOMPILE_HEADERS=On -DCMAKE_C_COMPILER_LAUNCHER=ccache -DCMAKE_CXX_COMPILER_LAUNCHER=ccache ..
           cmake --build . -- -j$(nproc)
 
       - name: Run CMake test
-        if: matrix.image != 'centos:7' && matrix.image != 'ubuntu:14.04' && matrix.image != 'ubuntu:16.04'
+        if: matrix.image != 'ubuntu:16.04'
         run: |
           cmake --build cmake.output --target check -- -j$(nproc)
 
   build_make:
 
     strategy:
       matrix:
-        image: ["centos:7", "ubuntu:14.04", "ubuntu:16.04", "ubuntu:18.04", "ubuntu:23.04"]
+        image: ["ubuntu:16.04", "ubuntu:18.04", "ubuntu:23.04"]
       fail-fast: false # Prefer quick result
 
     runs-on: ubuntu-22.04
@@ -109,13 +92,6 @@ jobs:
     steps:
       - uses: actions/checkout@v3
 
-      - name: Install missing software on CentOS 7
-        if: matrix.image == 'centos:7'
-        run: |
-          yum install -y gcc-c++ make which python3 pcre-devel
-          yum --enablerepo=extras install -y epel-release
-          yum install -y ccache
-
       - name: Install missing software on ubuntu
         if: contains(matrix.image, 'ubuntu')
         run: |
@@ -127,7 +103,6 @@ jobs:
       # - it doesn't support centos
       - name: ccache
         uses: hendrikmuhs/ccache-action@v1.2
-        if: matrix.image != 'ubuntu:14.04' # no support for --set-config
         with:
           key: ${{ github.workflow }}-${{ matrix.image }}
 
 
@@ -1,11 +1,10 @@
 if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
-    if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.8)
-        message(ERROR "GCC >= 4.8 required - detected ${CMAKE_CXX_COMPILER_VERSION} not supported")
+    if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5.1)
+        message(ERROR "GCC >= 5.1 required - detected ${CMAKE_CXX_COMPILER_VERSION} not supported")
     endif ()
 elseif(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
-    # TODO: verify this
-    if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 2.9)
-        message(ERROR "Clang >= 2.9 required - detected ${CMAKE_CXX_COMPILER_VERSION} not supported")
+    if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.5)
+        message(ERROR "Clang >= 3.5 required - detected ${CMAKE_CXX_COMPILER_VERSION} not supported")
     endif ()
 elseif(MSVC)
     if (MSVC_VERSION VERSION_LESS 1800)
 
@@ -27,22 +27,22 @@ You can stop the script whenever you like with Ctrl C.
 
 ## Compiling
 
-Any C++11 compiler should work. For compilers with partial C++11 support it may work. If your compiler has the C++11 features that are available in Visual Studio 2013 / GCC 4.8 then it will work.
+Cppcheck requires a C++ compiler with (partial) C++11 support. Minimum requires versions are GCC 5.1 / Clang 3.5 / Visual Studio 2013.
 
-To build the GUI, you need Qt.
+To build the GUI application, you need to use the qmake (deprecated) or CMake build system.
 
 When building the command line tool, [PCRE](http://www.pcre.org/) is optional. It is used if you build with rules.
 
 There are multiple compilation choices:
-* qmake - cross platform build tool
-* cmake - cross platform build tool
-* Windows: Visual Studio (VS 2013 and above)
-* Windows: Qt Creator + mingw
+* qmake - cross platform build tool (deprecated)
+* CMake - cross platform build tool
+* Windows: Visual Studio
+* Windows: Qt Creator + MinGW
 * gnu make
-* g++ 4.8 (or later)
-* clang++
+* GCC (g++)
+* Clang (clang++)
 
-### cmake
+### CMake
 
 Example, compiling Cppcheck with cmake:
 
 
@@ -24,4 +24,5 @@ Deprecations:
 
 Other:
 - "USE_QT6=On" will no longer fallback to Qt5 when Qt6 is not found.
-- When the execution of an addon fails with an exitcode it will now result in an 'internalError' instead of being silently ignored.
+- When the execution of an addon fails with an exitcode it will now result in an 'internalError' instead of being silently ignored.
+- The minimum required compiler versions have been bumped to GCC 5.1 / Clang 3.5