only fetch acts and compile it if not found in image

.gitmodules

@@ -1,9 +1,6 @@
 [submodule "docs/doxygen.conf/doxygen-awesome-css"]
 	path = docs/doxygen.conf/doxygen-awesome-css
 	url = https://github.com/jothepro/doxygen-awesome-css
-[submodule "Tracking/acts"]
-	path = Tracking/acts
-	url = https://github.com/acts-project/acts
 [submodule "Trigger/ruckus"]
 	path = Trigger/ruckus
 	url = https://github.com/slaclab/ruckus

CMakeLists.txt

@@ -33,10 +33,9 @@ list(APPEND CMAKE_MODULE_PATH ${LDMX_SW_SOURCE_DIR}/cmake/)
 # is set to NOTFOUND.
 include(BuildMacros RESULT_VARIABLE build_macros_found)
 
-# Adding ROOT, ACTS, HLS arb prec as "SYSTEM" 
+# Adding ROOT as "SYSTEM" 
 # which will silence compiler warnings from these 3rd party softwares
 include_directories(SYSTEM /usr/local/include/root)
-include_directories(SYSTEM Tracking/acts/Core/include)
 
 # FunctionalCoreTest.cxx doesnt comply with clang-tidy but that's ok
 set_source_files_properties(Framework/test/FunctionalCoreTest.cxx PROPERTIES COMPILE_OPTIONS "-Wno-null-dereference")

Tracking/CMakeLists.txt

@@ -58,20 +58,30 @@ if(BUILD_EVENT_ONLY)
      return()
 endif()
 
-# since ACTS changes frequently enough, we build it as a submodule of Tracking
-#   here we could 'set' some CMake variables that we would have passed to 'cmake' on
-#   the command line with '-D' if we were building ACTS directly.
-# for example, disable the building of examples (which is already disabled by default)
-#set(ACTS_BUILD_EXAMPLES OFF)     # don't waste time building examples
-add_subdirectory(acts) # now build acts
-# luckily for us, adding ACTS as a subdirectory produces the same CMake targets
-#   as find_package, so we don't need to do anything else from here on out
-
 find_package(Eigen3 CONFIG REQUIRED)
+# if you want to try an alternate Acts, you can
+# 1. comment out the stuff here and replace with add_subdirectory(acts)
+# 2. git clone acts into this directory and choose your version
+find_package(Acts QUIET)
+if (NOT Acts_FOUND)
+  message(STATUS "Did not find Acts, downloading and compiling it here")
+  include(FetchContent)
+  FetchContent_Declare(
+      Acts
+      URL https://github.com/acts-project/acts/archive/refs/tags/v36.0.0.tar.gz
+      URL_HASH MD5=f543dd8ba030bea2e4ee2f1b07dbe7c0
+  )
+  FetchContent_MakeAvailable(Acts)
+  FetchContent_GetProperties(Acts)
+  # Adding Acts as "SYSTEM" 
+  # which will silence compiler warnings from these 3rd party softwares
+  include_directories(SYSTEM "${Acts_SOURCE_DIR}/Core/include")
+else()
+  message(STATUS "Found Acts ${Acts_VERSION}")
+endif()
 
 setup_geant4_target()
 
-
 file(GLOB SRC_FILES CONFIGURE_DEPENDS 
   ${PROJECT_SOURCE_DIR}/src/Tracking/Sim/[a-zA-z]*.cxx
   ${PROJECT_SOURCE_DIR}/src/Tracking/Reco/[a-zA-z]*.cxx

cmake/BuildMacros.cmake

@@ -25,7 +25,7 @@ function(message)
     list(REMOVE_AT ARGV 0)
     _message("${green}[ INFO ]: ${ARGV}${color_reset}")
   else()
-    _message("${green} ${ARGV} ${color_reset}")
+    _message(${ARGV})
   endif()
 endfunction()