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#
# This function will prevent in-source builds
function(AssureOutOfSourceBuilds)
# make sure the user doesn't play dirty with symlinks
get_filename_component(srcdir "${CMAKE_SOURCE_DIR}" REALPATH)
get_filename_component(bindir "${CMAKE_BINARY_DIR}" REALPATH)
# disallow in-source builds
if("${srcdir}" STREQUAL "${bindir}")
message("######################################################")
message("# lapack should not be configured & built in the lapack source directory")
message("# You must run cmake in a build directory.")
message("# For example:")
message("# mkdir lapack-Sandbox ; cd lapack-sandbox")
message("# git clone https://github.com/Reference-LAPACK/lapack.git # or download & unpack the source tarball")
message("# mkdir lapack-build")
message("# this will create the following directory structure")
message("#")
message("# lapack-Sandbox")
message("# +--lapack")
message("# +--lapack-build")
message("#")
message("# Then you can proceed to configure and build")
message("# by using the following commands")
message("#")
message("# cd lapack-build")
message("# cmake ../lapack # or ccmake, or cmake-gui ")
message("# make")
message("#")
message("# NOTE: Given that you already tried to make an in-source build")
message("# CMake have already created several files & directories")
message("# in your source tree. run 'git status' to find them and")
message("# remove them by doing:")
message("#")
message("# cd lapack-Sandbox/lapack")
message("# git clean -n -d")
message("# git clean -f -d")
message("# git checkout --")
message("#")
message("######################################################")
message(FATAL_ERROR "Quitting configuration")
endif()
endfunction()
AssureOutOfSourceBuilds()
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