SConstruct

   1 import os
   2 AddOption('--float', choices=('4', '8', '16'), default=8, metavar='4,8,16', help='floating-point number bytes')
   3 AddOption('--tools', default='', help='append the default tool list')
   4 vars = Variables()
   5 vars.Add('CC', help='The C compiler')
   6 vars.Add('CFLAGS', help='The C compiler flags')
   7 vars.Add('LINKFLAGS', help='The linker flags')
   8 env = Environment(
   9     ENV=os.environ.copy(),
  10     tools=['default'] + GetOption('tools').split(','),
  11     variables=vars,
  12 )
  13 env.Append(CPPPATH=('include'))
  14 env.Append(CPPDEFINES=('A_EXPORTS'))
  15 env.Append(CPPDEFINES=('A_HAVA_H', '"a.scons.h"'))
  16 def Undefine(conf):
  17     if '\n' not in conf.config_h_text:
  18         return
  19     conf.config_h_text = conf.config_h_text.replace(
  20         conf.config_h_text.splitlines()[-1] + '\n', ''
  21     )
  22 conf = env.Configure(config_h='include/a/a.scons.h')
  23 A_SIZE_POINTER = conf.CheckTypeSize('void *')
  24 Undefine(conf)
  25 conf.Define('A_SIZE_POINTER', A_SIZE_POINTER)
  26 res = conf.TryRun('''#include <stdio.h>
  27 int main()
  28 {
  29     int const x = 1;
  30     printf("%s", *(char *)&x ? "1234" : "4321");
  31     return 0;
  32 }
  33 ''', '.c')
  34 if res[0]:
  35     conf.Define('A_BYTE_ORDER', res[1], 'The byte order of compiler target architecture.')
  36 A_SIZE_FLOAT = int(env.GetOption('float'))
  37 conf.Define('A_SIZE_FLOAT', A_SIZE_FLOAT, "The size of `a_float', as computed by sizeof.")
  38 conf.CheckLib('m')
  39 Undefine(conf)
  40 for func in (
  41     'expm1', 'log1p', 'hypot', 'atan2',
  42     'csqrt', 'cpow', 'cexp', 'clog',
  43     'csin', 'ccos', 'ctan',
  44     'csinh', 'ccosh', 'ctanh',
  45     'casin', 'cacos', 'catan',
  46     'casinh', 'cacosh', 'catanh'
  47 ):
  48     name = 'A_HAVE_' + func.upper()
  49     if A_SIZE_FLOAT == 0x10:
  50         func += 'l'
  51     if A_SIZE_FLOAT == 0x04:
  52         func += 'f'
  53     ok = conf.CheckFunc(func)
  54     Undefine(conf)
  55     if ok:
  56         conf.Define(name, '1')
  57 env = conf.Finish()
  58 a = env.SharedObject(env.Glob('src/*.c') + env.Glob('src/*/*.c'))
  59 if env['PLATFORM'] == 'win32':
  60     liba = env.SharedLibrary('liba', a)
  61 else:
  62     liba = env.SharedLibrary('a', a)
  63 alib = env.StaticLibrary('a', a)
  64 env.Install()
  65 if env.GetOption('install_sandbox'):
  66     include = env.Install('include', source='include/a')
  67     def install_fixup(source, target, env):
  68         source = source[0].get_relpath() + '/a.h'
  69         target = target[0].get_relpath() + '/a.h'
  70         with open(source, "r") as f:
  71             text = f.read()
  72         cur = "#if defined(A_HAVE_H)"
  73         new = '#include "a.scons.h"\n' + cur
  74         text = text.replace(cur, new)
  75         with open(target, "wb") as f:
  76             f.write(text.encode())
  77     env.AddPostAction(include, install_fixup)
  78     env.Install('lib', source=[alib, liba])