build: initialize previously uninitialized variables

build-support/custom-modules/ns3-cmake-package.cmake

@@ -23,6 +23,7 @@ set(CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_PREFIX}/lib:$ORIGIN/:$ORIGIN/../lib")
 # Add the 64 suffix to the library path when manually requested with the
 # -DNS3_USE_LIB64=ON flag. May be necessary depending on the target platform.
 # This is used to properly build the manylinux pip wheel.
+set(NS3_USE_LIB64 FALSE)
 if(${NS3_USE_LIB64})
   link_directories(${CMAKE_OUTPUT_DIRECTORY}/lib64)
   set(CMAKE_INSTALL_RPATH

build-support/custom-modules/ns3-filter-modules.cmake

@@ -95,15 +95,16 @@ function(recursive_dependency module_name)
   endif()
 
   # cmake-format: off
-    # Scan dependencies required by this module examples
-    #if(${ENABLE_EXAMPLES})
-    #  string(REPLACE "${module_name}" "${module_name}/examples" examples_cmakelists ${examples_cmakelists})
-    #  if(EXISTS ${examples_cmakelists})
-    #    file(READ ${examples_cmakelists} cmakelists_content)
-    #    filter_libraries(${cmakelists_content} example_matches)
-    #  endif()
-    #endif()
-    # cmake-format: on
+  # Scan dependencies required by this module examples
+  set(example_matches)
+  #if(${ENABLE_EXAMPLES})
+  #  string(REPLACE "${module_name}" "${module_name}/examples" examples_cmakelists ${examples_cmakelists})
+  #  if(EXISTS ${examples_cmakelists})
+  #    file(READ ${examples_cmakelists} cmakelists_content)
+  #    filter_libraries(${cmakelists_content} example_matches)
+  #  endif()
+  #endif()
+  # cmake-format: on
 
   # For each dependency, call this same function
   set(matches "${matches};${example_matches}")

build-support/custom-modules/ns3-module-macros.cmake

@@ -168,6 +168,7 @@ function(build_lib)
   add_library(ns3::${lib${BLIB_LIBNAME}} ALIAS ${lib${BLIB_LIBNAME}})
 
   # Associate public headers with library for installation purposes
+  set(config_headers)
   if("${BLIB_LIBNAME}" STREQUAL "core")
     set(config_headers ${CMAKE_HEADER_OUTPUT_DIRECTORY}/config-store-config.h
                        ${CMAKE_HEADER_OUTPUT_DIRECTORY}/core-config.h

build-support/macros-and-definitions.cmake

@@ -542,6 +542,7 @@ macro(process_options)
 
   # GTK3 Don't search for it if you don't have it installed, as it take an
   # insane amount of time
+  set(GTK3_FOUND FALSE)
   if(${NS3_GTK3})
     disable_cmake_warnings()
     find_package(HarfBuzz QUIET)
@@ -609,6 +610,7 @@ macro(process_options)
   set(Python3_EXECUTABLE)
   set(Python3_FOUND FALSE)
   set(Python3_INCLUDE_DIRS)
+  set(Python3_Interpreter_FOUND FALSE)
   if(${NS3_PYTHON_BINDINGS})
     find_package(Python3 COMPONENTS Interpreter Development)
   else()

src/config-store/CMakeLists.txt

@@ -1,3 +1,6 @@
+set(gtk3_sources)
+set(gtk3_headers)
+set(gtk_libraries)
 if(${GTK3_FOUND})
   set(gtk3_sources
       model/display-functions.cc
@@ -21,6 +24,8 @@ if(${GTK3_FOUND})
   endif()
 endif()
 
+set(xml2_sources)
+set(xml2_libraries)
 if(${LIBXML2_FOUND})
   set(xml2_sources
       model/xml-config.cc

src/core/CMakeLists.txt

@@ -71,6 +71,9 @@ elseif(
   )
 endif()
 
+set(example_as_test_sources)
+set(example_as_test_headers)
+set(example_as_test_suite)
 if(${ENABLE_EXAMPLES})
   set(example_as_test_sources
       model/example-as-test.cc

src/fd-net-device/CMakeLists.txt

@@ -26,6 +26,9 @@ check_include_file(
 )
 
 include(FindPkgConfig)
+set(DPDK_INCLUDE_DIRS
+    ""
+)
 if(PKG_CONFIG_FOUND)
   pkg_check_modules(
     DPDK
@@ -137,6 +140,8 @@ if(${ENABLE_FDNETDEV})
     FdNetDevice
   )
 
+  set(emu_sources)
+  set(emu_headers)
   if(${ENABLE_EMUNETDEV})
     set(emu_sources
         helper/emu-fd-net-device-helper.cc
@@ -172,6 +177,8 @@ if(${ENABLE_FDNETDEV})
     )
   endif()
 
+  set(tap_sources)
+  set(tap_headers)
   if(${ENABLE_TAPNETDEV})
     set(tap_sources
         helper/tap-fd-net-device-helper.cc
@@ -208,6 +215,8 @@ if(${ENABLE_FDNETDEV})
     )
   endif()
 
+  set(netmap_sources)
+  set(netmap_headers)
   if(${ENABLE_NETMAP_EMU})
     set(netmap_sources
         helper/netmap-net-device-helper.cc
@@ -241,6 +250,9 @@ if(${ENABLE_FDNETDEV})
     )
   endif()
 
+  set(dpdk_sources)
+  set(dpdk_headers)
+  set(dpdk_libraries)
   if(${ENABLE_DPDKDEVNET})
     set(dpdk_sources
         model/dpdk-net-device.cc

src/stats/CMakeLists.txt

@@ -1,6 +1,6 @@
 set(sqlite_sources)
 set(sqlite_headers)
-set(private_sqlite_header)
+set(private_sqlite_headers)
 set(sqlite_libraries)
 if(${ENABLE_SQLITE})
   set(sqlite_sources