Force caching of the CMAKE_INSTALL_DIR variable

Reorder check on ALICE_INSTALL

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2064a161d80b79349ed377455e1eabcd7333a4ca..eddf81a017e1036ab140c829558183f5c09e1389 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -27,22 +27,25 @@ endif(NOT ALICE_ROOT)
 
 set(ALICE_INSTALL $ENV{ALICE_INSTALL})
 # Set AliRoot Installation directory 
-if(NOT ALICE_INSTALL)
-  message(STATUS "AliRoot files will be installed in ${ALICE_ROOT}. You can specify a different location by setting ALICE_INSTALL environment variable")
-  set(ALICE_INSTALL ${ALICE_ROOT})
-else()
-  message(STATUS "AliRoot files will be installed in ${ALICE_INSTALL}")
-endif(NOT ALICE_INSTALL)
-if(${ALICE_INSTALL} STREQUAL ${CMAKE_BINARY_DIR})
-  message(FATAL_ERROR "Install dir should be different from build dir")
-endif()
-
 # If CMAKE_INSTALL_PREFIX was not set than we set it to ALICE_INSTALL. 
 # If ALICE_INSTALL was not defined than it will default to source directory
 if(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
-  set(CMAKE_INSTALL_PREFIX ${ALICE_INSTALL})
+    if(ALICE_INSTALL)
+       message(STATUS "AliRoot files will be installed in ${ALICE_INSTALL}")
+    else()
+       message(STATUS "AliRoot files will be installed in ${ALICE_ROOT}. You
+       can specify a different location by passing -DCMAKE_INSTALL_PREFIX or
+       by setting ALICE_INSTALL environment variable")
+       set(ALICE_INSTALL ${ALICE_ROOT})
+       if(${ALICE_INSTALL} STREQUAL ${CMAKE_BINARY_DIR})
+           message(FATAL_ERROR "The install directory must differ from the
+           build directory")
+       endif()
+    endif()
+    set(CMAKE_INSTALL_PREFIX ${ALICE_INSTALL} CACHE STRING "Install dir" FORCE)
 endif()
 
+
 # Environment for SHUTTLE
 set(DIMDIR $ENV{DIMDIR})
 set(ODIR $ENV{ODIR})