Hide the use of FetchContent behind a flag

FetchContent is now disabled by default, when the project is included as
an subproject by another top-level project.
Also, every usage of FetchContent is behind a separate flag to enable and
disable the usage with granular control.

CMakeLists.txt

@@ -47,9 +47,14 @@ if(POLICY CMP0135)
 endif()
 
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/cmake")
-include(FetchContent)
 include(enable_extensions)
 
+if (PROJECT_IS_TOP_LEVEL)
+    set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
+    set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
+    set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
+endif()
+
 if(DRAMSYS_ENABLE_COVERAGE)
     include(coverage)
 endif()
@@ -57,9 +62,18 @@ endif()
 ### Project settings ###
 option(DRAMSYS_BUILD_TESTS "Build DRAMSys unit tests" OFF)
 option(DRAMSYS_BUILD_BENCHMARKS "Build DRAMSys benchmarks" OFF)
-option(DRAMSYS_BUILD_CLI "Build DRAMSys Command Line Tool" ON)
+option(DRAMSYS_BUILD_CLI "Build DRAMSys Command Line Tool" ${PROJECT_IS_TOP_LEVEL})
 option(DRAMSYS_BUILD_TRACE_ANALYZER "Build DRAMSys Trace Analyzer" OFF)
-option(DRAMSYS_WITH_DRAMPOWER "Build with DRAMPower support enabled." ON)
+option(DRAMSYS_WITH_DRAMPOWER "Build with DRAMPower support enabled." OFF)
+
+# Use sane defaults for FetchContent:
+# In case we are the top-level project, get everything by default
+# In case we are included in another project, the user might want to provide their own system dependencies
+option(DRAMSYS_USE_FETCH_CONTENT "Enable the FetchContent module" ${PROJECT_IS_TOP_LEVEL})
+option(DRAMSYS_USE_FETCH_CONTENT_INTERNAL "Enable FetchContent to provide internal dependencies" ${DRAMSYS_USE_FETCH_CONTENT})
+option(DRAMSYS_USE_FETCH_CONTENT_SYSTEMC "Enable FetchContent to provide SystemC" ${DRAMSYS_USE_FETCH_CONTENT})
+option(DRAMSYS_USE_FETCH_CONTENT_SQLITE3 "Enable FetchContent to provide SQLite3" ${DRAMSYS_USE_FETCH_CONTENT})
+option(DRAMSYS_USE_FETCH_CONTENT_NLOHMANN_JSON "Enable FetchContent to provide nlohmann_json" ${DRAMSYS_USE_FETCH_CONTENT})
 
 # TODO: Remove as soon as DRAMPower is updated
 set(DRAMSYS_SHARED_LIBS OFF)
@@ -68,12 +82,6 @@ if(DEFINED DRAMSYS_SHARED_LIBS)
     set(BUILD_SHARED_LIBS ${DRAMSYS_SHARED_LIBS})
 endif()
 
-if (PROJECT_IS_TOP_LEVEL)
-    set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
-    set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
-    set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
-endif()
-
 ### DRAMSys directories ###
 set(DRAMSYS_SOURCE_DIR      "${CMAKE_CURRENT_SOURCE_DIR}/src")
 set(DRAMSYS_LIBRARY_DIR     "${CMAKE_CURRENT_SOURCE_DIR}/lib")
@@ -85,42 +93,52 @@ set(DRAMSYS_EXTENSIONS_DIR  "${CMAKE_CURRENT_SOURCE_DIR}/extensions")
 ###           Library Settings              ###
 ###############################################
 
-### nlohmann_json ###
+if (DRAMSYS_USE_FETCH_CONTENT)
-add_subdirectory(${DRAMSYS_LIBRARY_DIR})
+    include(FetchContent)
+
+    if (DRAMSYS_USE_FETCH_CONTENT_NLOHMANN_JSON)
+        FetchContent_Declare(nlohmann_json
+            URL https://github.com/nlohmann/json/releases/download/v3.11.3/json.tar.xz
+            OVERRIDE_FIND_PACKAGE
+        )
 
-if (NOT TARGET nlohmann_json::nlohmann_json)
-    FetchContent_Declare(nlohmann_json URL https://github.com/nlohmann/json/releases/download/v3.11.3/json.tar.xz)
         FetchContent_MakeAvailable(nlohmann_json)
     endif()
 
-### SystemC ###
+    if (DRAMSYS_USE_FETCH_CONTENT_SQLITE3)
-if (NOT TARGET SystemC::systemc) # TODO ist das wirklich so korrekt?
+        add_subdirectory(${DRAMSYS_LIBRARY_DIR}/sqlite3)
-    set(DISABLE_COPYRIGHT_MESSAGE True)
+    endif()
+
+    if (DRAMSYS_USE_FETCH_CONTENT_SYSTEMC)
+        set(DISABLE_COPYRIGHT_MESSAGE TRUE)
 
         FetchContent_Declare(
-        systemc
+            SystemCLanguage
             GIT_REPOSITORY https://github.com/accellera-official/systemc.git
-        GIT_TAG 2.3.4)
+            GIT_TAG 2.3.4
+            OVERRIDE_FIND_PACKAGE
+        )
 
-    FetchContent_MakeAvailable(systemc)
+        FetchContent_MakeAvailable(SystemCLanguage)
 
         # Set include directories to SYSTEM to suppress warnings
         set_target_properties(systemc PROPERTIES SYSTEM TRUE)
-else()
-    find_package(systemc NAMES SystemCLanguage)
     endif()
 
-
+    if (DRAMSYS_WITH_DRAMPOWER AND DRAMSYS_USE_FETCH_CONTENT_INTERNAL)
-### DRAMPower ###
-if (DRAMSYS_WITH_DRAMPOWER)
         FetchContent_Declare(
             DRAMPower
             GIT_REPOSITORY https://github.com/tukl-msd/DRAMPower
-        GIT_TAG 9e64a1b)
+            GIT_TAG 9e64a1b
+        )
 
         FetchContent_MakeAvailable(DRAMPower)
-    set_target_properties(DRAMPower PROPERTIES FOLDER lib)
     endif()
+endif()
+
+find_package(SystemCLanguage REQUIRED)
+find_package(SQLite3 REQUIRED)
+find_package(nlohmann_json REQUIRED)
 
 ###############################################
 ###           Source Directory              ###

CMakePresets.json

@@ -22,8 +22,8 @@
             "inherits": "cmake-pedantic",
             "cacheVariables": {
                 "DRAMSYS_BUILD_TESTS": "ON",
-                "DRAMSYS_WITH_DRAMPOWER": "ON",
+                "DRAMSYS_BUILD_TRACE_ANALYZER": "ON",
-                "DRAMSYS_BUILD_TRACE_ANALYZER": "ON"
+                "DRAMSYS_WITH_DRAMPOWER": "ON"
             }
         },
         {

lib/CMakeLists.txt

@@ -1 +0,0 @@
-add_subdirectory(sqlite3)

lib/sqlite3/CMakeLists.txt

@@ -2,8 +2,12 @@
 ###              sqlite3             ###
 ########################################
 
-FetchContent_Declare(sqlite3 URL "https://www.sqlite.org/2022/sqlite-amalgamation-3400100.zip")
+FetchContent_Declare(SQLite3
-FetchContent_MakeAvailable(sqlite3)
+    URL "https://www.sqlite.org/2022/sqlite-amalgamation-3400100.zip"
+    OVERRIDE_FIND_PACKAGE
+)
+
+FetchContent_MakeAvailable(SQLite3)
 
 add_library(sqlite3)
 target_sources(sqlite3 PRIVATE
@@ -14,11 +18,8 @@ target_sources(sqlite3 PRIVATE
 
 target_include_directories(sqlite3 PUBLIC ${sqlite3_SOURCE_DIR})
 
-set_target_properties(sqlite3 PROPERTIES FOLDER lib)
-
 ### Compile options ###
 # refer to https://www.sqlite.org/compile.html
-
 target_compile_definitions(sqlite3 PUBLIC SQLITE_ENABLE_RTREE SQLITE_OMIT_LOAD_EXTENSION)
 
 # Use the same name as the FindSQLite3 script of CMake uses

src/traceAnalyzer/CMakeLists.txt

@@ -38,29 +38,35 @@
 ###           TraceAnalyzer          ###
 ########################################
 
-# Add Python3 Dependency:
+option(DRAMSYS_USE_FETCH_CONTENT_PYBIND "Enable FetchContent to provide pybind11" ${DRAMSYS_USE_FETCH_CONTENT})
-find_package(Python3 COMPONENTS Development Interpreter)
 
+if (DRAMSYS_USE_FETCH_CONTENT)
+    if (DRAMSYS_USE_FETCH_CONTENT_PYBIND)
         FetchContent_Declare(
             pybind11
             URL https://github.com/pybind/pybind11/archive/refs/tags/v2.13.1.zip
+            OVERRIDE_FIND_PACKAGE
         )
         
         FetchContent_MakeAvailable(pybind11)
+    endif()
+endif()
 
-# Add QT Library:
 if (APPLE)
     set(Qt5_DIR "/opt/homebrew/opt/qt@5/lib/cmake/Qt5")
 endif(APPLE)
+
 find_package(Qt5 COMPONENTS Core Gui Widgets Sql REQUIRED)
+find_package(Qwt REQUIRED)
+
+find_package(Python3 COMPONENTS Development Interpreter REQUIRED)
+find_package(pybind11 REQUIRED)
+
 set(CMAKE_AUTOMOC ON)
 set(CMAKE_AUTOUIC ON)
 set(CMAKE_AUTORCC ON)
 set(CMAKE_INCLUDE_CURRENT_DIR ON)
 
-# Add QWT Dependency:
-find_package(Qwt REQUIRED)
-
 add_executable(TraceAnalyzer
     businessObjects/commentmodel.cpp
     businessObjects/configmodels.cpp

tests/CMakeLists.txt

@@ -2,12 +2,22 @@ include(GoogleTest)
 
 set(DRAMSYS_TEST_RESOURCES_DIR "${CMAKE_CURRENT_SOURCE_DIR}/resources")
 
-FetchContent_Declare(
+option(DRAMSYS_USE_FETCH_CONTENT_GTEST "Enable FetchContent to provide gtest" ${DRAMSYS_USE_FETCH_CONTENT})
-    googletest
-    GIT_REPOSITORY https://github.com/google/googletest
-    GIT_TAG release-1.12.1)
 
-FetchContent_MakeAvailable(googletest)
+if (DRAMSYS_USE_FETCH_CONTENT)
+    if (DRAMSYS_USE_FETCH_CONTENT_GTEST)
+        FetchContent_Declare(
+            GTest
+            GIT_REPOSITORY https://github.com/google/googletest
+            GIT_TAG release-1.12.1
+            OVERRIDE_FIND_PACKAGE
+        )
+
+        FetchContent_MakeAvailable(GTest)
+    endif()
+endif()
+
+find_package(GTest REQUIRED)
 
 add_subdirectory(tests_configuration)
 add_subdirectory(tests_dramsys)

tests/tests_configuration/CMakeLists.txt

@@ -11,6 +11,7 @@ set_target_properties(tests_configuration PROPERTIES FOLDER tests/configuration)
 
 target_link_libraries(tests_configuration PRIVATE
     DRAMSys::config
+    gtest
     gtest_main
 )
 

tests/tests_dramsys/CMakeLists.txt

@@ -14,6 +14,7 @@ target_include_directories(tests_dramsys PUBLIC ${PROJECT_SOURCE_DIR})
 set_target_properties(tests_dramsys PROPERTIES FOLDER tests)
 target_link_libraries(tests_dramsys 
     DRAMSys::libdramsys
+    gtest
     gtest_main
 )
 

tests/tests_simulator/CMakeLists.txt

@@ -13,6 +13,7 @@ set_target_properties(tests_simulator PROPERTIES FOLDER tests/simulator)
 
 target_link_libraries(tests_simulator PRIVATE
     simulator
+    gtest
     gtest_main
 )