diff options
| -rw-r--r-- | CMakeLists.txt | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/CMakeLists.txt b/CMakeLists.txt index 420e379c1..08548b2b4 100644 --- a/CMakeLists.txt +++ b/CMakeLists.txt @@ -16,6 +16,23 @@ # ####################################################################### +# Prevent building in the source tree - don't pollute the sources +####################################################################### + +if("${CMAKE_BINARY_DIR}" STREQUAL "${CMAKE_SOURCE_DIR}") + message("") + message(STATUS "=======================================================================") + message(STATUS " NOTE: In-source builds of FLTK are disabled to prevent writing to the") + message(STATUS " NOTE: source tree. Please create a subfolder (e.g. 'build') and use") + message(STATUS " NOTE: `cmake ..` inside it or use for instance `cmake . -B build`.") + message(STATUS " NOTE: CMake will, however, create CMakeCache.txt and CMakeFiles/* .") + message(STATUS " NOTE: You must delete CMakeCache.txt and CMakeFiles/* manually.") + message(STATUS "=======================================================================") + message("") + message(FATAL_ERROR "*** In-source builds are disabled, please read notes above! ***") +endif() + +####################################################################### # Set CMake minimum version first: must be set before `project()` ####################################################################### |