Hello,
I use the ExternalProjet_Add function to download and install third-party
libraries.
Here is an example of a CMakeLists file containing such a call:
=====================================
cmake_minimum_required (VERSION 2.6)
project (example CXX)
set(CMAKE_VERBOSE_MAKEFILE ON)
include(ProcessorCount)
ProcessorCount(N)
if(NOT N EQUAL 0)
set(CMAKE_BUILD_FLAGS -j${N})
endif()
include(ExternalProject)
set(EXTERNAL_DIR ${CMAKE_CURRENT_BINARY_DIR})
ExternalProject_Add(eigen
PREFIX ${EXTERNAL_DIR}/eigen
DOWNLOAD_DIR ${EXTERNAL_DIR}/eigen/download
SOURCE_DIR ${EXTERNAL_DIR}/eigen/src
BINARY_DIR ${EXTERNAL_DIR}/eigen/build
STAMP_DIR ${EXTERNAL_DIR}/eigen/stamp
INSTALL_DIR ${EXTERNAL_DIR}/eigen/install
URL http://bitbucket.org/eigen/eigen/get/3.2.4.tar.gz
URL_MD5 4d0d77e06fef87b4fcd2c9b72cc8dc55
CMAKE_ARGS -D CMAKE_INSTALL_PREFIX=<INSTALL_DIR>
)
=====================================
Everything works fine, except after calling "make clean".
Thanks to URL_MD5, the third-party library is not downloaded again.
However, configuration, build and install steps are performed again whereas the
library has not been uninstalled during cleaning.
How could I tell to ExternalProject_Add not to configure/build/install my
library unless this library has been removed from my computer?
Thank you very much for your help!
Cédric
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