lib/ccan/wscript

   1 #!/usr/bin/env python
   2
   3 import Logs, sys
   4
   5 def configure(conf):
   6     # FIXME: if they don't have -Werror, these will all fail.  But they
   7     # probably will anyway...
   8     conf.CHECK_CODE('int __attribute__((cold)) func(int x) { return x; }',
   9                     addmain=False, link=False, cflags="-Werror",
  10                     define='HAVE_ATTRIBUTE_COLD')
  11     conf.CHECK_CODE('int __attribute__((const)) func(int x) { return x; }',
  12                     addmain=False, link=False, cflags="-Werror",
  13                     define='HAVE_ATTRIBUTE_CONST')
  14     conf.CHECK_CODE('void __attribute__((noreturn)) func(int x) { exit(x); }',
  15                     addmain=False, link=False, cflags="-Werror",
  16                     define='HAVE_ATTRIBUTE_NORETURN')
  17     conf.CHECK_CODE('void __attribute__((format(__printf__, 1, 2))) func(const char *fmt, ...) { }',
  18                     addmain=False, link=False, cflags="-Werror",
  19                     define='HAVE_ATTRIBUTE_PRINTF')
  20     conf.CHECK_CODE('int __attribute__((unused)) func(int x) { return x; }',
  21                     addmain=False, link=False, cflags="-Werror",
  22                     define='HAVE_ATTRIBUTE_UNUSED')
  23     conf.CHECK_CODE('int __attribute__((used)) func(int x) { return x; }',
  24                     addmain=False, link=False, cflags="-Werror",
  25                     define='HAVE_ATTRIBUTE_USED')
  26     # We try to use headers for a compile-time test.
  27     conf.CHECK_CODE(code = """#ifdef __BYTE_ORDER
  28                         #define B __BYTE_ORDER
  29                         #elif defined(BYTE_ORDER)
  30                         #define B BYTE_ORDER
  31                         #endif
  32
  33                         #ifdef __LITTLE_ENDIAN
  34                         #define LITTLE __LITTLE_ENDIAN
  35                         #elif defined(LITTLE_ENDIAN)
  36                         #define LITTLE LITTLE_ENDIAN
  37                         #endif
  38
  39                         #if !defined(LITTLE) || !defined(B) || LITTLE != B
  40                         #error Not little endian.
  41                         #endif""",
  42                            headers="endian.h sys/endian.h",
  43                            define="HAVE_LITTLE_ENDIAN")
  44     conf.CHECK_CODE(code = """#ifdef __BYTE_ORDER
  45                         #define B __BYTE_ORDER
  46                         #elif defined(BYTE_ORDER)
  47                         #define B BYTE_ORDER
  48                         #endif
  49
  50                         #ifdef __BIG_ENDIAN
  51                         #define BIG __BIG_ENDIAN
  52                         #elif defined(BIG_ENDIAN)
  53                         #define BIG BIG_ENDIAN
  54                         #endif
  55
  56                         #if !defined(BIG) || !defined(B) || BIG != B
  57                         #error Not big endian.
  58                         #endif""",
  59                            headers="endian.h sys/endian.h",
  60                            define="HAVE_BIG_ENDIAN")
  61
  62     if not conf.CONFIG_SET("HAVE_BIG_ENDIAN") and not conf.CONFIG_SET("HAVE_LITTLE_ENDIAN"):
  63         # That didn't work!  Do runtime test.
  64         conf.CHECK_CODE("""union { int i; char c[sizeof(int)]; } u;
  65           u.i = 0x01020304;
  66           return u.c[0] == 0x04 && u.c[1] == 0x03 && u.c[2] == 0x02 && u.c[3] == 0x01 ? 0 : 1;""",
  67                         addmain=True, execute=True,
  68                         define='HAVE_LITTLE_ENDIAN',
  69                         msg="Checking for HAVE_LITTLE_ENDIAN - runtime")
  70         conf.CHECK_CODE("""union { int i; char c[sizeof(int)]; } u;
  71           u.i = 0x01020304;
  72           return u.c[0] == 0x01 && u.c[1] == 0x02 && u.c[2] == 0x03 && u.c[3] == 0x04 ? 0 : 1;""",
  73                         addmain=True, execute=True,
  74                         define='HAVE_BIG_ENDIAN',
  75                         msg="Checking for HAVE_BIG_ENDIAN - runtime")
  76
  77     # Extra sanity check.
  78     if conf.CONFIG_SET("HAVE_BIG_ENDIAN") == conf.CONFIG_SET("HAVE_LITTLE_ENDIAN"):
  79         Logs.error("Failed endian determination.  The PDP-11 is back?")
  80         sys.exit(1)
  81
  82     conf.CHECK_CODE('return __builtin_clz(1) == (sizeof(int)*8 - 1) ? 0 : 1;',
  83                     link=True,
  84                     define='HAVE_BUILTIN_CLZ')
  85     conf.CHECK_CODE('return __builtin_clzl(1) == (sizeof(long)*8 - 1) ? 0 : 1;',
  86                     link=True,
  87                     define='HAVE_BUILTIN_CLZL')
  88     conf.CHECK_CODE('return __builtin_clzll(1) == (sizeof(long long)*8 - 1) ? 0 : 1;',
  89                     link=True,
  90                     define='HAVE_BUILTIN_CLZLL')
  91     conf.CHECK_CODE('return __builtin_constant_p(1) ? 0 : 1;',
  92                     link=True,
  93                     define='HAVE_BUILTIN_CONSTANT_P')
  94     conf.CHECK_CODE('return __builtin_expect(main != 0, 1) ? 0 : 1;',
  95                     link=True,
  96                     define='HAVE_BUILTIN_EXPECT')
  97     conf.CHECK_CODE('return __builtin_popcountl(255L) == 8 ? 0 : 1;',
  98                     link=True,
  99                     define='HAVE_BUILTIN_POPCOUNTL')
 100     conf.CHECK_CODE('return __builtin_types_compatible_p(char *, int) ? 1 : 0;',
 101                     link=True,
 102                     define='HAVE_BUILTIN_TYPES_COMPATIBLE_P')
 103     conf.CHECK_CODE('int *foo = (int[]) { 1, 2, 3, 4 }; return foo[0] ? 0 : 1;',
 104                     define='HAVE_COMPOUND_LITERALS')
 105     conf.CHECK_CODE("""#include <ctype.h>
 106           int main(void) { return isblank(' ') ? 0 : 1; }""",
 107                     link=True, addmain=False, add_headers=False,
 108                     define='HAVE_ISBLANK')
 109     conf.CHECK_CODE('int x = 1; __typeof__(x) i; i = x; return i == x ? 0 : 1;',
 110                     link=True,
 111                     define='HAVE_TYPEOF')
 112     conf.CHECK_CODE('int __attribute__((warn_unused_result)) func(int x) { return x; }',
 113                     addmain=False, link=False, cflags="-Werror",
 114                     define='HAVE_WARN_UNUSED_RESULT')
 115
 116 def build(bld):
 117     bld.SAMBA_LIBRARY('ccan',
 118                       vnum="0.1-init-1161-g661d41f",
 119                       source=bld.path.ant_glob('*/*.c'),
 120                       private_library=True)