lib/ccan/wscript

   1 #!/usr/bin/env python
   2
   3 import Logs, sys, Options
   4
   5 def configure(conf):
   6     conf.DEFINE('HAVE_CCAN', 1)
   7     # FIXME: if they don't have -Werror, these will all fail.  But they
   8     # probably will anyway...
   9     conf.CHECK_CODE('int __attribute__((cold)) func(int x) { return x; }',
  10                     addmain=False, link=False, cflags="-Werror",
  11                     define='HAVE_ATTRIBUTE_COLD')
  12     conf.CHECK_CODE('int __attribute__((const)) func(int x) { return x; }',
  13                     addmain=False, link=False, cflags="-Werror",
  14                     define='HAVE_ATTRIBUTE_CONST')
  15     conf.CHECK_CODE('void __attribute__((noreturn)) func(int x) { exit(x); }',
  16                     addmain=False, link=False, cflags="-Werror",
  17                     define='HAVE_ATTRIBUTE_NORETURN')
  18     conf.CHECK_CODE('void __attribute__((format(__printf__, 1, 2))) func(const char *fmt, ...) { }',
  19                     addmain=False, link=False, cflags="-Werror",
  20                     define='HAVE_ATTRIBUTE_PRINTF')
  21     conf.CHECK_CODE('int __attribute__((unused)) func(int x) { return x; }',
  22                     addmain=False, link=False, cflags="-Werror",
  23                     define='HAVE_ATTRIBUTE_UNUSED')
  24     conf.CHECK_CODE('int __attribute__((used)) func(int x) { return x; }',
  25                     addmain=False, link=False, cflags="-Werror",
  26                     define='HAVE_ATTRIBUTE_USED')
  27     # We try to use headers for a compile-time test.
  28     conf.CHECK_CODE(code = """#ifdef __BYTE_ORDER
  29                         #define B __BYTE_ORDER
  30                         #elif defined(BYTE_ORDER)
  31                         #define B BYTE_ORDER
  32                         #endif
  33
  34                         #ifdef __LITTLE_ENDIAN
  35                         #define LITTLE __LITTLE_ENDIAN
  36                         #elif defined(LITTLE_ENDIAN)
  37                         #define LITTLE LITTLE_ENDIAN
  38                         #endif
  39
  40                         #if !defined(LITTLE) || !defined(B) || LITTLE != B
  41                         #error Not little endian.
  42                         #endif""",
  43                            headers="endian.h sys/endian.h",
  44                            define="HAVE_LITTLE_ENDIAN")
  45     conf.CHECK_CODE(code = """#ifdef __BYTE_ORDER
  46                         #define B __BYTE_ORDER
  47                         #elif defined(BYTE_ORDER)
  48                         #define B BYTE_ORDER
  49                         #endif
  50
  51                         #ifdef __BIG_ENDIAN
  52                         #define BIG __BIG_ENDIAN
  53                         #elif defined(BIG_ENDIAN)
  54                         #define BIG BIG_ENDIAN
  55                         #endif
  56
  57                         #if !defined(BIG) || !defined(B) || BIG != B
  58                         #error Not big endian.
  59                         #endif""",
  60                            headers="endian.h sys/endian.h",
  61                            define="HAVE_BIG_ENDIAN")
  62
  63     if not conf.CONFIG_SET("HAVE_BIG_ENDIAN") and not conf.CONFIG_SET("HAVE_LITTLE_ENDIAN"):
  64         # That didn't work!  Do runtime test.
  65         conf.CHECK_CODE("""union { int i; char c[sizeof(int)]; } u;
  66           u.i = 0x01020304;
  67           return u.c[0] == 0x04 && u.c[1] == 0x03 && u.c[2] == 0x02 && u.c[3] == 0x01 ? 0 : 1;""",
  68                         addmain=True, execute=True,
  69                         define='HAVE_LITTLE_ENDIAN',
  70                         msg="Checking for HAVE_LITTLE_ENDIAN - runtime")
  71         conf.CHECK_CODE("""union { int i; char c[sizeof(int)]; } u;
  72           u.i = 0x01020304;
  73           return u.c[0] == 0x01 && u.c[1] == 0x02 && u.c[2] == 0x03 && u.c[3] == 0x04 ? 0 : 1;""",
  74                         addmain=True, execute=True,
  75                         define='HAVE_BIG_ENDIAN',
  76                         msg="Checking for HAVE_BIG_ENDIAN - runtime")
  77
  78     # Extra sanity check.
  79     if conf.CONFIG_SET("HAVE_BIG_ENDIAN") == conf.CONFIG_SET("HAVE_LITTLE_ENDIAN"):
  80         Logs.error("Failed endian determination.  The PDP-11 is back?")
  81         sys.exit(1)
  82
  83     conf.CHECK_CODE('return __builtin_choose_expr(1, 0, "garbage");',
  84                     link=True,
  85                     define='HAVE_BUILTIN_CHOOSE_EXPR')
  86     conf.CHECK_CODE('return __builtin_clz(1) == (sizeof(int)*8 - 1) ? 0 : 1;',
  87                     link=True,
  88                     define='HAVE_BUILTIN_CLZ')
  89     conf.CHECK_CODE('return __builtin_clzl(1) == (sizeof(long)*8 - 1) ? 0 : 1;',
  90                     link=True,
  91                     define='HAVE_BUILTIN_CLZL')
  92     conf.CHECK_CODE('return __builtin_clzll(1) == (sizeof(long long)*8 - 1) ? 0 : 1;',
  93                     link=True,
  94                     define='HAVE_BUILTIN_CLZLL')
  95     conf.CHECK_CODE('return __builtin_constant_p(1) ? 0 : 1;',
  96                     link=True,
  97                     define='HAVE_BUILTIN_CONSTANT_P')
  98     conf.CHECK_CODE('return __builtin_expect(main != 0, 1) ? 0 : 1;',
  99                     link=True,
 100                     define='HAVE_BUILTIN_EXPECT')
 101     conf.CHECK_CODE('return __builtin_popcountl(255L) == 8 ? 0 : 1;',
 102                     link=True,
 103                     define='HAVE_BUILTIN_POPCOUNTL')
 104     conf.CHECK_CODE('return __builtin_types_compatible_p(char *, int) ? 1 : 0;',
 105                     link=True,
 106                     define='HAVE_BUILTIN_TYPES_COMPATIBLE_P')
 107     conf.CHECK_CODE('int *foo = (int[]) { 1, 2, 3, 4 }; return foo[0] ? 0 : 1;',
 108                     define='HAVE_COMPOUND_LITERALS')
 109     conf.CHECK_CODE("""#include <ctype.h>
 110           int main(void) { return isblank(' ') ? 0 : 1; }""",
 111                     link=True, addmain=False, add_headers=False,
 112                     define='HAVE_ISBLANK')
 113     conf.CHECK_CODE('int x = 1; __typeof__(x) i; i = x; return i == x ? 0 : 1;',
 114                     link=True,
 115                     define='HAVE_TYPEOF')
 116     conf.CHECK_CODE('int __attribute__((warn_unused_result)) func(int x) { return x; }',
 117                     addmain=False, link=False, cflags="-Werror",
 118                     define='HAVE_WARN_UNUSED_RESULT')
 119
 120     # backtrace could be in libexecinfo or in libc
 121     conf.CHECK_FUNCS_IN('backtrace backtrace_symbols', 'execinfo', checklibc=True, headers='execinfo.h')
 122
 123 def build(bld):
 124
 125     for ccan_dir in ["err", "hash", "htable", "ilog", "likely", "list", "read_write_all", "str", "tally", "time"]:
 126         bld.SAMBA_SUBSYSTEM('ccan-%s' % ccan_dir,
 127                             source=bld.path.ant_glob('%s/*.c' % ccan_dir))
 128
 129     if bld.env.DEVELOPER_MODE:
 130         bld.SAMBA_LIBRARY('ccan-failtest',
 131                           source=bld.path.ant_glob('failtest/*.c'),
 132                           deps='execinfo ccan ccan-htable ccan-list ccan-read_write_all ccan-time',
 133                           private_library=True)
 134
 135     bld.SAMBA_LIBRARY('ccan',
 136                       source='',
 137                       deps='ccan-err ccan-hash ccan-ilog ccan-likely ccan-tally',
 138                       private_library=True)