1#
2# This function will prevent in-source builds
3function(AssureOutOfSourceBuilds)
4  # make sure the user doesn't play dirty with symlinks
5  get_filename_component(srcdir "${CMAKE_SOURCE_DIR}" REALPATH)
6  get_filename_component(bindir "${CMAKE_BINARY_DIR}" REALPATH)
7
8  # disallow in-source builds
9  if("${srcdir}" STREQUAL "${bindir}")
10    message("######################################################")
11    message("# jsoncpp should not be configured & built in the jsoncpp source directory")
12    message("# You must run cmake in a build directory.")
13    message("# For example:")
14    message("# mkdir jsoncpp-Sandbox ; cd jsoncpp-sandbox")
15    message("# git clone https://github.com/open-source-parsers/jsoncpp.git # or download & unpack the source tarball")
16    message("# mkdir jsoncpp-build")
17    message("# this will create the following directory structure")
18    message("#")
19    message("# jsoncpp-Sandbox")
20    message("#  +--jsoncpp")
21    message("#  +--jsoncpp-build")
22    message("#")
23    message("# Then you can proceed to configure and build")
24    message("# by using the following commands")
25    message("#")
26    message("# cd jsoncpp-build")
27    message("# cmake ../jsoncpp # or ccmake, or cmake-gui ")
28    message("# make")
29    message("#")
30    message("# NOTE: Given that you already tried to make an in-source build")
31    message("#       CMake have already created several files & directories")
32    message("#       in your source tree. run 'git status' to find them and")
33    message("#       remove them by doing:")
34    message("#")
35    message("#       cd jsoncpp-Sandbox/jsoncpp")
36    message("#       git clean -n -d")
37    message("#       git clean -f -d")
38    message("#       git checkout --")
39    message("#")
40    message("######################################################")
41    message(FATAL_ERROR "Quitting configuration")
42  endif()
43endfunction()
44
45AssureOutOfSourceBuilds()
46