shithub: puzzles

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Support earlier versions of CMake.

At least, for the Unix build, so as to support Debian stable and a
couple of prior Ubuntu LTSes.

Not much needed to change in the cmake scripts; the only noticeable
difference was that the 'install' command needs an explicit RUNTIME
DESTINATION.

--- a/CMakeLists.txt

+++ b/CMakeLists.txt

@@ -1,4 +1,4 @@

-cmake_minimum_required(VERSION 3.16)

+cmake_minimum_required(VERSION 3.5)

 project(puzzles

   LANGUAGES C)

--- a/cmake/platforms/unix.cmake

+++ b/cmake/platforms/unix.cmake

@@ -66,7 +66,16 @@

 function(set_platform_puzzle_target_properties NAME TARGET)

   set_target_properties(${TARGET} PROPERTIES

     OUTPUT_NAME ${NAME_PREFIX}${NAME})

-  install(TARGETS ${TARGET})

+

+  if(CMAKE_VERSION VERSION_LESS 3.14)

+    # CMake 3.13 and earlier required an explicit install destination.

+    install(TARGETS ${TARGET} RUNTIME DESTINATION bin)

+  else()

+    # 3.14 and above selects a sensible default, which we should avoid

+    # overriding here so that end users can override it using

+    # CMAKE_INSTALL_BINDIR.

+    install(TARGETS ${TARGET})

+  endif()

 endfunction()

 function(build_platform_extras)