Cmake build: Prevent multiple configuration runs

Normally the sequence to compile is
1.) cmake <source> <some parameters>
2.) make

but since 'unset(var CACHE)' changed the cache, the following call to 'make'
triggered the configuration run.

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9410c391d271e0d1ea54bd3567597acece210e41..69b4d3af187b62b263d7f94a4f26469f81fccc1a 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -580,18 +580,22 @@ get_locale_destination(LYX_LOCALEDIR)
 set(LYX_ABS_INSTALLED_LOCALEDIR "${CMAKE_INSTALL_PREFIX}/${LYX_LOCALEDIR}")
 set(LYX_ABS_TOP_SRCDIR "${TOP_SRC_DIR}")
 
-unset(LYX_MAN_DIR CACHE)
 if(LYX_BUNDLE AND APPLE)
-       set(LYX_MAN_DIR "${LYX_DATA_SUBDIR}" CACHE STRING "Install location for man pages.")
+       set(LYX_MAN_DIR_tmp "${LYX_DATA_SUBDIR}")
 else()
        if(WIN32)
-               set(LYX_MAN_DIR "${CMAKE_BINARY_DIR}/usr/local/man/" CACHE STRING "Install location for man pages.")
+               set(LYX_MAN_DIR_tmp "${CMAKE_BINARY_DIR}/usr/local/man/")
        elseif(UNIX)
-               set(LYX_MAN_DIR "${CMAKE_INSTALL_PREFIX}/share/man/" CACHE STRING "Install location for man pages.")
+               set(LYX_MAN_DIR_tmp "${CMAKE_INSTALL_PREFIX}/share/man/")
        else()
-               set(LYX_MAN_DIR "${CMAKE_INSTALL_PREFIX}/man/" CACHE STRING "Install location for man pages.")
+               set(LYX_MAN_DIR_tmp "${CMAKE_INSTALL_PREFIX}/man/")
        endif()
 endif()
+if (NOT LYX_MAN_DIR_tmp EQUAL "${LYX_MAN_DIR}")
+       unset(LYX_MAN_DIR CACHE)
+       set(LYX_MAN_DIR "${LYX_MAN_DIR_tmp}" CACHE STRING "Install location for man pages.")
+endif()
+unset(LYX_MAN_DIR_tmp)
 mark_as_advanced(LYX_MAN_DIR)
 
 # The Win installer cannot be built by CMake because one needs to install plugins for NSIS