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     conf.CHECK_HEADERS('err.h')
   8     conf.CHECK_HEADERS('byteswap.h')
   9     conf.CHECK_FUNCS('bswap_64', link=False, headers="byteswap.h")
  10     conf.CHECK_CODE('int __attribute__((cold)) func(int x) { return x; }',
  11                     addmain=False, link=False, cflags=conf.env['WERROR_CFLAGS'],
  12                     define='HAVE_ATTRIBUTE_COLD')
  13     conf.CHECK_CODE('int __attribute__((const)) func(int x) { return x; }',
  14                     addmain=False, link=False, cflags=conf.env['WERROR_CFLAGS'],
  15                     define='HAVE_ATTRIBUTE_CONST')
  16     conf.CHECK_CODE('void __attribute__((noreturn)) func(int x) { exit(x); }',
  17                     addmain=False, link=False, cflags=conf.env['WERROR_CFLAGS'],
  18                     define='HAVE_ATTRIBUTE_NORETURN')
  19     conf.CHECK_CODE('void __attribute__((format(__printf__, 1, 2))) func(const char *fmt, ...) { }',
  20                     addmain=False, link=False, cflags=conf.env['WERROR_CFLAGS'],
  21                     define='HAVE_ATTRIBUTE_PRINTF')
  22     conf.CHECK_CODE('int __attribute__((unused)) func(int x) { return x; }',
  23                     addmain=False, link=False, cflags=conf.env['WERROR_CFLAGS'],
  24                     define='HAVE_ATTRIBUTE_UNUSED')
  25     conf.CHECK_CODE('int __attribute__((used)) func(int x) { return x; }',
  26                     addmain=False, link=False, cflags=conf.env['WERROR_CFLAGS'],
  27                     define='HAVE_ATTRIBUTE_USED')
  28     # We try to use headers for a compile-time test.
  29     conf.CHECK_CODE(code = """#ifdef __BYTE_ORDER
  30                         #define B __BYTE_ORDER
  31                         #elif defined(BYTE_ORDER)
  32                         #define B BYTE_ORDER
  33                         #endif
  34
  35                         #ifdef __LITTLE_ENDIAN
  36                         #define LITTLE __LITTLE_ENDIAN
  37                         #elif defined(LITTLE_ENDIAN)
  38                         #define LITTLE LITTLE_ENDIAN
  39                         #endif
  40
  41                         #if !defined(LITTLE) || !defined(B) || LITTLE != B
  42                         #error Not little endian.
  43                         #endif""",
  44                            headers="endian.h sys/endian.h",
  45                            define="HAVE_LITTLE_ENDIAN")
  46     conf.CHECK_CODE(code = """#ifdef __BYTE_ORDER
  47                         #define B __BYTE_ORDER
  48                         #elif defined(BYTE_ORDER)
  49                         #define B BYTE_ORDER
  50                         #endif
  51
  52                         #ifdef __BIG_ENDIAN
  53                         #define BIG __BIG_ENDIAN
  54                         #elif defined(BIG_ENDIAN)
  55                         #define BIG BIG_ENDIAN
  56                         #endif
  57
  58                         #if !defined(BIG) || !defined(B) || BIG != B
  59                         #error Not big endian.
  60                         #endif""",
  61                            headers="endian.h sys/endian.h",
  62                            define="HAVE_BIG_ENDIAN")
  63
  64     if not conf.CONFIG_SET("HAVE_BIG_ENDIAN") and not conf.CONFIG_SET("HAVE_LITTLE_ENDIAN"):
  65         # That didn't work!  Do runtime test.
  66         conf.CHECK_CODE("""union { int i; char c[sizeof(int)]; } u;
  67           u.i = 0x01020304;
  68           return u.c[0] == 0x04 && u.c[1] == 0x03 && u.c[2] == 0x02 && u.c[3] == 0x01 ? 0 : 1;""",
  69                         addmain=True, execute=True,
  70                         define='HAVE_LITTLE_ENDIAN',
  71                         msg="Checking for HAVE_LITTLE_ENDIAN - runtime")
  72         conf.CHECK_CODE("""union { int i; char c[sizeof(int)]; } u;
  73           u.i = 0x01020304;
  74           return u.c[0] == 0x01 && u.c[1] == 0x02 && u.c[2] == 0x03 && u.c[3] == 0x04 ? 0 : 1;""",
  75                         addmain=True, execute=True,
  76                         define='HAVE_BIG_ENDIAN',
  77                         msg="Checking for HAVE_BIG_ENDIAN - runtime")
  78
  79     # Extra sanity check.
  80     if conf.CONFIG_SET("HAVE_BIG_ENDIAN") == conf.CONFIG_SET("HAVE_LITTLE_ENDIAN"):
  81         Logs.error("Failed endian determination.  The PDP-11 is back?")
  82         sys.exit(1)
  83
  84     conf.CHECK_CODE('return __builtin_choose_expr(1, 0, "garbage");',
  85                     link=True,
  86                     define='HAVE_BUILTIN_CHOOSE_EXPR')
  87     conf.CHECK_CODE('return __builtin_clz(1) == (sizeof(int)*8 - 1) ? 0 : 1;',
  88                     link=True,
  89                     define='HAVE_BUILTIN_CLZ')
  90     conf.CHECK_CODE('return __builtin_clzl(1) == (sizeof(long)*8 - 1) ? 0 : 1;',
  91                     link=True,
  92                     define='HAVE_BUILTIN_CLZL')
  93     conf.CHECK_CODE('return __builtin_clzll(1) == (sizeof(long long)*8 - 1) ? 0 : 1;',
  94                     link=True,
  95                     define='HAVE_BUILTIN_CLZLL')
  96     conf.CHECK_CODE('return __builtin_constant_p(1) ? 0 : 1;',
  97                     link=True,
  98                     define='HAVE_BUILTIN_CONSTANT_P')
  99     conf.CHECK_CODE('return __builtin_expect(main != 0, 1) ? 0 : 1;',
 100                     link=True,
 101                     define='HAVE_BUILTIN_EXPECT')
 102     conf.CHECK_CODE('return __builtin_popcountl(255L) == 8 ? 0 : 1;',
 103                     link=True,
 104                     define='HAVE_BUILTIN_POPCOUNTL')
 105     conf.CHECK_CODE('return __builtin_types_compatible_p(char *, int) ? 1 : 0;',
 106                     link=True,
 107                     define='HAVE_BUILTIN_TYPES_COMPATIBLE_P')
 108     conf.CHECK_CODE('int *foo = (int[]) { 1, 2, 3, 4 }; return foo[0] ? 0 : 1;',
 109                     define='HAVE_COMPOUND_LITERALS')
 110     conf.CHECK_CODE('struct foo { unsigned int x; int arr[]; };',
 111                     addmain=False, link=False,
 112                     define='HAVE_FLEXIBLE_ARRAY_MEMBER')
 113     conf.CHECK_CODE("""#include <ctype.h>
 114           int main(void) { return isblank(' ') ? 0 : 1; }""",
 115                     link=True, addmain=False, add_headers=False,
 116                     define='HAVE_ISBLANK')
 117     conf.CHECK_CODE('int x = 1; __typeof__(x) i; i = x; return i == x ? 0 : 1;',
 118                     link=True,
 119                     define='HAVE_TYPEOF')
 120     conf.CHECK_CODE('int __attribute__((warn_unused_result)) func(int x) { return x; }',
 121                     addmain=False, link=False, cflags=conf.env['WERROR_CFLAGS'],
 122                     define='HAVE_WARN_UNUSED_RESULT')
 123
 124     # backtrace could be in libexecinfo or in libc
 125     conf.CHECK_FUNCS_IN('backtrace backtrace_symbols', 'execinfo', checklibc=True, headers='execinfo.h')
 126
 127     # Only check for FILE_OFFSET_BITS=64 if off_t is normally small:
 128     # use raw routines because wrappers include previous _GNU_SOURCE
 129     # or _FILE_OFFSET_BITS defines.
 130     conf.check(fragment="""#include <sys/types.h>
 131                int main(void) { return !(sizeof(off_t) < 8); }""",
 132                execute=True, msg='Checking for small off_t',
 133                define_name='SMALL_OFF_T')
 134     # Unreliable return value above, hence use define.
 135     if conf.CONFIG_SET('SMALL_OFF_T'):
 136         conf.check(fragment="""#include <sys/types.h>
 137                    int main(void) { return !(sizeof(off_t) >= 8); }""",
 138                    execute=True, msg='Checking for -D_FILE_OFFSET_BITS=64',
 139                    ccflags='-D_FILE_OFFSET_BITS=64',
 140                    define_name='HAVE_FILE_OFFSET_BITS')
 141
 142 def ccan_module(bld, name, deps=''):
 143     bld.SAMBA_SUBSYSTEM('ccan-%s' % name,
 144                         source=bld.path.ant_glob('%s/*.c' % name),
 145                         deps=deps)
 146     bld.env.CCAN_MODS += 'ccan-%s ' % name
 147
 148 def build(bld):
 149     bld.env.CCAN_MODS = ""
 150
 151     # These have actual C files.
 152     ccan_module(bld, 'hash', 'ccan-build_assert')
 153     ccan_module(bld, 'ilog', 'ccan-compiler');
 154     ccan_module(bld, 'read_write_all')
 155     ccan_module(bld, 'str', 'ccan-build_assert')
 156     ccan_module(bld, 'tally', 'ccan-build_assert ccan-likely')
 157
 158     # These are headers only.
 159     ccan_module(bld, 'array_size', 'ccan-build_assert')
 160     ccan_module(bld, 'asearch','ccan-typesafe_cb ccan-array_size')
 161     ccan_module(bld, 'build_assert')
 162     ccan_module(bld, 'cast', 'ccan-build_assert')
 163     ccan_module(bld, 'check_type', 'ccan-build_assert')
 164     ccan_module(bld, 'compiler')
 165     ccan_module(bld, 'endian')
 166     ccan_module(bld, 'likely', 'ccan-str')
 167     ccan_module(bld, 'typesafe_cb')
 168     ccan_module(bld, 'err', 'ccan-compiler')
 169
 170     # Failtest pulls in a lot of stuff, and it's only for unit tests.
 171     if bld.env.DEVELOPER_MODE:
 172         ccan_module(bld, 'container_of', 'ccan-check_type')
 173         ccan_module(bld, 'htable', 'ccan-compiler')
 174         ccan_module(bld, 'list', 'ccan-container_of')
 175         ccan_module(bld, 'time')
 176         ccan_module(bld, 'tcon')
 177         ccan_module(bld, 'tlist', 'ccan-list ccan-tcon')
 178         ccan_module(bld, 'failtest',
 179                     '''
 180                     ccan-err ccan-hash ccan-htable ccan-list
 181                     ccan-read_write_all ccan-str ccan-time execinfo
 182                     ''')
 183
 184     # This is the complete CCAN collection as one group.
 185     bld.SAMBA_LIBRARY('ccan',
 186                       source='',
 187                       deps=bld.env.CCAN_MODS,
 188                       private_library=True,
 189                       grouping_library=True)