SConstruct

   1 import os
   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(
  20     options = opts,
  21     tools=['default'],
  22     ENV = os.environ)
  23 Help(opts.GenerateHelpText(env))
  24 opts.Save('scache.conf', env)
  25
  26 class OurTests:
  27     def check_stack_prot(context):
  28         """check whether gcc supports -fno-stack-protector"""
  29         context.Message('Checking for -fno-stack-protector... ')
  30         context.env['CFLAGS'] = '-fno-stack-protector'
  31         result = context.TryCompile('', '.c')
  32         context.Result(result)
  33         return result
  34
  35 old_env = env.Clone()
  36
  37 if not env.GetOption('clean'):
  38     ### RUN TESTS AND CONFIGURE ENVIRONMENT ###
  39     conf = Configure(env, custom_tests = OurTests.__dict__)
  40
  41     # If the compiler has -fno-stack-protector, we need to disable
  42     # it to stop gcc inserting stack protection code (which doesn't
  43     # work in a kernel)
  44     if conf.check_stack_prot():
  45         env['CFLAGS'] = old_env['CFLAGS'] + ' -fno-stack-protector'
  46     else:
  47         env['CFLAGS'] = old_env['CFLAGS']
  48
  49     env = conf.Finish()
  50
  51 # set nice pretty messages
  52 if not env['verbose']:
  53     env['CCCOMSTR'] =     '     Compiling \e[32m$TARGET\e[0m'
  54     env['ASPPCOMSTR'] =   '    Assembling \e[32m$TARGET\e[0m'
  55     env['LINKCOMSTR'] =   '       Linking \e[32m$TARGET\e[0m'
  56     env['ARCOMSTR'] =     '     Archiving \e[32m$TARGET\e[0m'
  57     env['RANLIBCOMSTR'] = '      Indexing \e[32m$TARGET\e[0m'
  58     env['NMCOMSTR'] =     '  Creating map \e[32m$TARGET\e[0m'
  59
  60 SConscript('SConscript',
  61     exports = ['env'],
  62     build_dir = env['BUILDDIR'],
  63     duplicate = 0)
  64
  65 # clean config data
  66 env.Clean('.', ['config.log', '.sconf_temp'])