Commit eb7962a02b749f3185e9970bb07c9f7c86b85d73
2016-04-25T18:16:46
CMakeLists.txt: Clarify that Un*x isn't supported At one time, it was possible to use CMake to build under Cygwin, but that hasn't worked since 1.4.1 (due to the Huffman codec changes that now require SIZEOF_SIZE_T to be defined for non-WIN32 platforms) and may have even been broken before that. Originally, we used the "date" command under MSYS in order to obtain the default build number, but that was rendered unnecessary by 5e3bb3e9 (v1.3 beta.) 9fe22dac (1.4 beta) further modified CMakeLists.txt so that the "date" command was only used on Cygwin, but for unexplained reasons, that commit also applied the (now vestigial) code to all non-WIN32 platforms. This prevented CMakeLists.txt from displaying an error if someone attempted to use the CMake build system on Un*x platforms, and that may have been behind the flurry of pull requests and issues-- including #21, #29, #37, #58, #73-- complaining that the CMake build system didn't work on Un*x platforms (although it was not until #73 that this bug came to light.) This commit removes all vestiges of Un*x support from the CMake build system and makes it clear that CMake cannot be used to build libjpeg-turbo on non-WIN32 platforms. It is our position that CMake will not be supported on non-WIN32 platforms until/unless the autotools build system is removed, and this will not happen without broad support from the community (including major O/S vendors.) If you are in favor of migrating the entire build system to CMake, then please make your voice heard by commenting on #56.