Allow sterile builds (#641)

A sterile build requires that all dependencies are already installed on the system and thus cannot be downloaded/built from source by the Dyninst build system.

CMakeLists.txt

@@ -6,6 +6,9 @@ set (CMAKE_SKIP_BUILD_RPATH FALSE)
 set (CMAKE_BUILD_WITH_INSTALL_RPATH FALSE)
 set (CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE)
 set (CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+set(STERILE_BUILD OFF CACHE BOOL "Do not download/build any third-party dependencies from source")
+
 LIST(FIND CMAKE_PLATFORM_IMPLICIT_LINK_DIRECTORIES 
 	  "${CMAKE_INSTALL_PREFIX}/lib" isSystemDir)
 IF("${isSystemDir}" STREQUAL "-1")

cmake/Boost.cmake

@@ -145,6 +145,8 @@ if(Boost_FOUND)
   set(Boost_LIBRARY_DIRS ${Boost_LIBRARY_DIRS} CACHE PATH "Boost library directory" FORCE)
   set(Boost_INCLUDE_DIR ${Boost_INCLUDE_DIR} CACHE PATH "Boost include directory" FORCE)
   add_library(boost SHARED IMPORTED)
+elseif(NOT Boost_FOUND AND STERILE_BUILD)
+  message(FATAL_ERROR "Boost not found and cannot be downloaded because build is sterile.")
 else()
   # If we didn't find a suitable version on the system, then download one from the web
   set(_boost_download_version "1.69.0")

cmake/ElfUtils.cmake

@@ -84,6 +84,8 @@ if(LibElf_FOUND AND LibDwarf_FOUND)
   set(_eu_lib_dirs ${LibElf_LIBRARY_DIRS} ${LibDwarf_LIBRARY_DIRS})
   set(_eu_libs ${LibElf_LIBRARIES} ${LibDwarf_LIBRARIES})
   add_library(ElfUtils SHARED IMPORTED)
+elseif(NOT (LibElf_FOUND AND LibDwarf_FOUND) AND STERILE_BUILD)
+  message(FATAL_ERROR "Elfutils not found and cannot be downloaded because build is sterile.")
 else()
   # If we didn't find a suitable version on the system, then download one from the web
   # NB: When building from source, we need at least elfutils-0.176 in order to use

cmake/LibIberty.cmake

@@ -60,6 +60,8 @@ if(LibIberty_FOUND)
   set(_li_lib_dirs ${LibIberty_LIBRARY_DIRS})
   set(_li_libs ${LibIberty_LIBRARIES})
   add_library(LibIberty STATIC IMPORTED)
+elseif(NOT LibIberty_FOUND AND STERILE_BUILD)
+  message(FATAL_ERROR "LibIberty not found and cannot be downloaded because build is sterile.")
 else()
   message(STATUS "${LibIberty_ERROR_REASON}")
   message(STATUS "Attempting to build LibIberty as external project")

cmake/ThreadingBuildingBlocks.cmake

@@ -95,6 +95,8 @@ if(TBB_FOUND)
   if(NOT TARGET TBB)
     add_library(TBB SHARED IMPORTED)
   endif()
+elseif(NOT TBB_FOUND AND STERILE_BUILD)
+  message(FATAL_ERROR "TBB not found and cannot be downloaded because build is sterile.")
 else()
   # If we didn't find a suitable version on the system, then download one from the web
   message(STATUS "${ThreadingBuildingBlocks_ERROR_REASON}")