Update minimum required CMake version to 3.1

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.0)
+cmake_minimum_required(VERSION 3.1)
 
 project(GLFW VERSION 3.4.0 LANGUAGES C)
 

README.md

@@ -85,7 +85,8 @@ in the documentation for more information.
 
 ## Dependencies
 
-GLFW itself depends only on the headers and libraries for your window system.
+GLFW itself needs only CMake 3.1 or later and the headers and libraries for your
+OS and window system.
 
 The (experimental) Wayland backend also depends on the `extra-cmake-modules`
 package, which is used to generated Wayland protocol headers.
@@ -123,6 +124,7 @@ information on what to include when reporting a bug.
  - Added `GLFW_RESIZE_EW_CURSOR` alias for `GLFW_HRESIZE_CURSOR` (#427)
  - Added `GLFW_RESIZE_NS_CURSOR` alias for `GLFW_VRESIZE_CURSOR` (#427)
  - Added `GLFW_POINTING_HAND_CURSOR` alias for `GLFW_HAND_CURSOR` (#427)
+ - Updated the minimum required CMake version to 3.1
  - Disabled tests and examples by default when built as a CMake subdirectory
  - Bugfix: The CMake config-file package used an absolute path and was not
    relocatable (#1470)

examples/CMakeLists.txt

@@ -17,17 +17,6 @@ elseif (APPLE)
     set(ICON glfw.icns)
 endif()
 
-if (${CMAKE_VERSION} VERSION_EQUAL "3.1.0" OR
-    ${CMAKE_VERSION} VERSION_GREATER "3.1.0")
-    set(CMAKE_C_STANDARD 99)
-else()
-    # Remove this fallback when removing support for CMake version less than 3.1
-    add_compile_options("$<$<C_COMPILER_ID:AppleClang>:-std=c99>"
-                        "$<$<C_COMPILER_ID:Clang>:-std=c99>"
-                        "$<$<C_COMPILER_ID:GNU>:-std=c99>")
-
-endif()
-
 set(GLAD_GL "${GLFW_SOURCE_DIR}/deps/glad/gl.h"
             "${GLFW_SOURCE_DIR}/deps/glad_gl.c")
 set(GETOPT "${GLFW_SOURCE_DIR}/deps/getopt.h"
@@ -55,6 +44,7 @@ set(GUI_ONLY_BINARIES boing gears heightmap particles sharing splitview
 set(CONSOLE_BINARIES offscreen)
 
 set_target_properties(${GUI_ONLY_BINARIES} ${CONSOLE_BINARIES} PROPERTIES
+                      C_STANDARD 99
                       FOLDER "GLFW3/Examples")
 
 if (GLFW_USE_OSMESA)

src/CMakeLists.txt

@@ -85,20 +85,9 @@ set_target_properties(glfw PROPERTIES
                       VERSION ${GLFW_VERSION_MAJOR}.${GLFW_VERSION_MINOR}
                       SOVERSION ${GLFW_VERSION_MAJOR}
                       POSITION_INDEPENDENT_CODE ON
+                      C_STANDARD 99
                       FOLDER "GLFW3")
 
-if (${CMAKE_VERSION} VERSION_EQUAL "3.1.0" OR
-    ${CMAKE_VERSION} VERSION_GREATER "3.1.0")
-
-    set_target_properties(glfw PROPERTIES C_STANDARD 99)
-else()
-    # Remove this fallback when removing support for CMake version less than 3.1
-    target_compile_options(glfw PRIVATE
-                           "$<$<C_COMPILER_ID:AppleClang>:-std=c99>"
-                           "$<$<C_COMPILER_ID:Clang>:-std=c99>"
-                           "$<$<C_COMPILER_ID:GNU>:-std=c99>")
-endif()
-
 target_compile_definitions(glfw PRIVATE _GLFW_USE_CONFIG_H)
 target_include_directories(glfw PUBLIC
                            "$<BUILD_INTERFACE:${GLFW_SOURCE_DIR}/include>"

tests/CMakeLists.txt

@@ -20,17 +20,6 @@ set(GETOPT "${GLFW_SOURCE_DIR}/deps/getopt.h"
 set(TINYCTHREAD "${GLFW_SOURCE_DIR}/deps/tinycthread.h"
                 "${GLFW_SOURCE_DIR}/deps/tinycthread.c")
 
-if (${CMAKE_VERSION} VERSION_EQUAL "3.1.0" OR
-    ${CMAKE_VERSION} VERSION_GREATER "3.1.0")
-    set(CMAKE_C_STANDARD 99)
-else()
-    # Remove this fallback when removing support for CMake version less than 3.1
-    add_compile_options("$<$<C_COMPILER_ID:AppleClang>:-std=c99>"
-                        "$<$<C_COMPILER_ID:Clang>:-std=c99>"
-                        "$<$<C_COMPILER_ID:GNU>:-std=c99>")
-
-endif()
-
 add_executable(clipboard clipboard.c ${GETOPT} ${GLAD_GL})
 add_executable(events events.c ${GETOPT} ${GLAD_GL})
 add_executable(msaa msaa.c ${GETOPT} ${GLAD_GL})
@@ -66,6 +55,7 @@ set(CONSOLE_BINARIES clipboard events msaa glfwinfo iconify monitors reopen
                      cursor)
 
 set_target_properties(${GUI_ONLY_BINARIES} ${CONSOLE_BINARIES} PROPERTIES
+                      C_STANDARD 99
                       FOLDER "GLFW3/Tests")
 
 if (MSVC)