It was necessary for me to disable some dependencies from the standard
package when I cross-compiled boost recently so I made a quick patch
to the 1.38 libs/CMakeList.txt to allow this. All it does is remove
values from BOOST_SUBPROJECT_DIRECTORIES if the user selected
ENABLE_$LIB = NO or the lib depends on another which has been removed.
I don't know if this functionality has already been patched in but in
case it is of use to someone building 1.38 here are the changes I
made. I bequeath this to boost if you want it :)
--James
--- boost_1_38_0/libs/CMakeLists.txt 2009-01-24 18:57:20.000000000 +0000
+++ boost_1_38_0.patched/libs/CMakeLists.txt 2009-04-01 17:44:35.000000000 +0100
@@ -35,6 +35,51 @@
set(CPACK_INSTALL_CMAKE_COMPONENTS_ALL)
list(SORT BOOST_SUBPROJECT_DIRS)
topological_sort(BOOST_SUBPROJECT_DIRS BOOST_ _DEPENDS)
+
+# Make a bunch of options like ENABLE_upcase(lib) in the cache. Check
+# if they've been disabled and add the lib to the PRUNE_LIST if they
+# have. Make a reverse dependancy table while we're at it.
+set(PRUNE_LIST)
+foreach (proj ${BOOST_SUBPROJECT_DIRS})
+ string(TOUPPER ${proj} proj_caps)
+ set(option_var ENABLE_${proj_caps})
+ option(${option_var} "Build the boost.${proj} library; if no then reverse deps are disabled." YES)
+
+ set(dep_list_var "BOOST_${proj_caps}_DEPENDS")
+ foreach (dep ${${dep_list_var}})
+ string(TOUPPER ${dep} dep_caps)
+ list(APPEND "BOOST_${dep_caps}_REVDEPENDS" ${proj})
+ endforeach()
+
+ if (NOT ${option_var})
+ message(STATUS "Disabling ${proj} because ${option_var} is off.")
+ set(mark_${dep}_removed TRUE)
+ list(APPEND PRUNE_LIST ${proj})
+ endif()
+endforeach()
+
+# Loop a stack of things to remove. Take them from BOOST_SUBPROJECT_DIRS.
+# mark_$proj_is our visited flag.
+while(PRUNE_LIST)
+ list(GET PRUNE_LIST 0 proj)
+ set(mark_${proj}_removed TRUE)
+ list(REMOVE_AT PRUNE_LIST 0)
+ list(REMOVE_ITEM BOOST_SUBPROJECT_DIRS ${proj})
+
+ string(TOUPPER ${proj} proj_caps)
+ # message(STATUS "Disable lib ${proj}")
+ set(revdep_var "BOOST_${proj_caps}_REVDEPENDS")
+ foreach(dep ${${revdep_var}})
+ # Don't recurse uselessly.
+ if (NOT mark_${dep}_removed)
+ message(STATUS "Disable ${dep} because it depends on ${proj}")
+ list(INSERT PRUNE_LIST 0 ${dep})
+ endif()
+ endforeach()
+
+ set(${revdep_var})
+endwhile()
+
add_subdirectories(" + " ${BOOST_SUBPROJECT_DIRS})
# Write out a GraphViz file containing inter-library dependencies.
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