SConstruct

   1 import os.path
   2
   3 opts = Options('scache.conf')
   4 ### These options are global defaults.
   5 ### If you want to change your options locally,
   6 ### give them to SCons on the command line, or
   7 ### edit scache.conf. Don't edit them here.
   8 opts.AddOptions(
   9     ('CC', 'Set the C compiler to use'),
  10     ('AS', 'Set the assembler to use'),
  11     ('LINK', 'Set the linker to use'),
  12     ('CFLAGS', 'Set the C compiler flags', '-ffreestanding -m32 -O3 -Wall -std=c99 -pedantic'),
  13     ('ASFLAGS', 'Set the assembler flags', ''),
  14     ('LINKFLAGS', 'Set the linker flags', '-ffreestanding -nostdlib -Wl,--gc-sections,-m,elf_i386'),
  15     ('BUILDDIR', 'Set the sub-directory to put object files in', 'build'),
  16     BoolOption('verbose', 'Show full commands during the build process', False),
  17 )
  18
  19 env = Environment(options = opts, tools=['default'])
  20 Help(opts.GenerateHelpText(env))
  21 opts.Save('scache.conf', env)
  22
  23 class OurTests:
  24     def check_stack_prot(context):
  25         """check whether gcc supports -fno-stack-protector"""
  26         context.Message('Checking for -fno-stack-protector... ')
  27         context.env['CFLAGS'] = '-fno-stack-protector'
  28         result = context.TryCompile('', '.c')
  29         context.Result(result)
  30         return result
  31
  32 old_env = env.Clone()
  33
  34 if not env.GetOption('clean'):
  35     ### RUN TESTS AND CONFIGURE ENVIRONMENT ###
  36     conf = Configure(env, custom_tests = OurTests.__dict__)
  37
  38     # If the compiler has -fno-stack-protector, we need to disable
  39     # it to stop gcc inserting stack protection code (which doesn't
  40     # work in a kernel)
  41     if conf.check_stack_prot():
  42         env['CFLAGS'] = old_env['CFLAGS'] + ' -fno-stack-protector'
  43     else:
  44         env['CFLAGS'] = old_env['CFLAGS']
  45
  46     env = conf.Finish()
  47
  48 # set nice pretty messages
  49 if not env['verbose']:
  50     env['CCCOMSTR'] =     '     Compiling \e[32m$TARGET\e[0m'
  51     env['ASPPCOMSTR'] =   '    Assembling \e[32m$TARGET\e[0m'
  52     env['LINKCOMSTR'] =   '       Linking \e[32m$TARGET\e[0m'
  53     env['ARCOMSTR'] =     '     Archiving \e[32m$TARGET\e[0m'
  54     env['RANLIBCOMSTR'] = '      Indexing \e[32m$TARGET\e[0m'
  55     env['NMCOMSTR'] =     '  Creating map \e[32m$TARGET\e[0m'
  56
  57 SConscript('SConscript',
  58     exports = ['env'],
  59     build_dir = env['BUILDDIR'],
  60     duplicate = 0)
  61
  62 # clean config data
  63 env.Clean('.', ['config.log', '.sconf_temp'])