build: Remove C dependency

CMakeLists.txt

@@ -6,7 +6,7 @@ cmake_minimum_required(VERSION 3.20..3.20)
 # ##############################################################################
 # Project name                        #
 # ##############################################################################
-project(NS3 CXX C)
+project(NS3 CXX)
 
 file(STRINGS VERSION NS3_VER)
 

build-support/macros-and-definitions.cmake

@@ -60,7 +60,6 @@ set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_EXTENSIONS OFF)
 
 # Include CMake files used for compiler checks
-include(CheckIncludeFile) # Used to check a single C header at a time
 include(CheckIncludeFileCXX) # Used to check a single C++ header at a time
 include(CheckIncludeFiles) # Used to check multiple headers at once
 include(CheckFunctionExists)
@@ -1129,11 +1128,11 @@ macro(process_options)
 
   # Check for required headers and functions, set flags if they're found or warn
   # if they're not found
-  check_include_file("sys/types.h" "HAVE_SYS_TYPES_H")
-  check_include_file("sys/stat.h" "HAVE_SYS_STAT_H")
-  check_include_file("dirent.h" "HAVE_DIRENT_H")
-  check_include_file("signal.h" "HAVE_SIGNAL_H")
-  check_include_file("netpacket/packet.h" "HAVE_PACKETH")
+  check_include_file_cxx("sys/types.h" "HAVE_SYS_TYPES_H")
+  check_include_file_cxx("sys/stat.h" "HAVE_SYS_STAT_H")
+  check_include_file_cxx("dirent.h" "HAVE_DIRENT_H")
+  check_include_file_cxx("signal.h" "HAVE_SIGNAL_H")
+  check_include_file_cxx("netpacket/packet.h" "HAVE_PACKETH")
   check_function_exists("getenv" "HAVE_GETENV")
 
   configure_file(

ns3

@@ -1179,8 +1179,6 @@ def extract_cmakecache_settings(current_cmake_cache_folder):
     current_settings.extend(re.findall("(CMAKE_GENERATOR):.*=(.*)", contents))  # extract generator
     current_settings.extend(re.findall("(CMAKE_CXX_COMPILER):.*=(.*)", contents))  # C++ compiler
     current_settings.extend(re.findall("(CMAKE_CXX_FLAGS):.*=(.*)", contents))  # C++ flags
-    current_settings.extend(re.findall("(CMAKE_C_COMPILER):.*=(.*)", contents))  # C compiler
-    current_settings.extend(re.findall("(CMAKE_C_FLAGS):.*=(.*)", contents))  # C flags
     current_settings.extend(
         re.findall("(CMAKE_INSTALL_PREFIX):.*=(.*)", contents)
     )  # installation directory

src/fd-net-device/CMakeLists.txt

@@ -1,26 +1,26 @@
 set(module_enabled_features) # modulegen_customizations consumes this list
 
-check_include_file(
+check_include_file_cxx(
   net/ethernet.h
   HAVE_NET_ETHERNET_H
 )
-check_include_file(
+check_include_file_cxx(
   netpacket/packet.h
   HAVE_PACKET_H
 )
-check_include_file(
+check_include_file_cxx(
   net/if.h
   HAVE_IF_NETS_H
 )
-check_include_file(
+check_include_file_cxx(
   linux/if_tun.h
   HAVE_IF_TUN_H
 )
-check_include_file(
+check_include_file_cxx(
   net/netmap_user.h
   HAVE_NETMAP_USER_H
 )
-check_include_file(
+check_include_file_cxx(
   sys/ioctl.h
   HAVE_SYS_IOCTL_H
 )