(WIP) Loader for 64 bit kernel.

SConstruct

@@ -14,6 +14,7 @@ AddOption(
 target  = GetOption('target')
 
 env = Environment(tools =  ['default', 'compilation_db'])
+env.Append(CFLAGS = ['-ffreestanding'])
 env.Append(CXXFLAGS = ['-ffreestanding', '-fno-exceptions', '-fno-rtti', '-std=c++20'])
 env.Append(LINKFLAGS = ['-T', 'linker.ld', '-ffreestanding', '-nostdlib'])
 env.Append(CPPPATH = ['#targets/_any/include', '#bastl/include'])
@@ -21,6 +22,7 @@ env.Append(CCFLAGS = ['-g', '-O0'])
 
 env['KERNEL_SOURCES'] = []
 env['KERNEL_DEPENDENCIES'] = []
+env['ISO_FILES'] = []
 env = SConscript('bastl/SConscript', exports = 'env')
 env = SConscript('targets/_any/SConscript', exports = 'env')
 env = SConscript(f'targets/{target}/SConscript', exports = 'env')
@@ -28,9 +30,15 @@ env = SConscript(f'targets/{target}/SConscript', exports = 'env')
 prog_os = env.Program(
     target = 'os.bin',
     source = env['KERNEL_SOURCES'],
-    LIBS = ['gcc']
+    LIBS = ['gcc'],
+    LINKCOM = env['KERNEL_LINKCOM']
 )
 env.Depends(prog_os, env['KERNEL_DEPENDENCIES'])
 env.Default(prog_os)
 comp_db = env.CompilationDatabase(target = '#compile_commands.json')
 env.Default(comp_db)
+
+iso_targets = []
+for iso_file in env['ISO_FILES']:
+    iso_targets.append(env.Command(f'iso/{iso_file["target"]}', iso_file["source"], Copy("$TARGET", "$SOURCE")))
+env.Command('os.iso', iso_targets, 'grub-mkrescue -o "$TARGET" "iso"')