configure: set HAVE___ATTRIBUTE__ for heimdal
[samba.git] / buildtools / wafsamba / wscript
old mode 100644 (file)
new mode 100755 (executable)
index c46c486..8802e5a
@@ -2,9 +2,9 @@
 
 # this is a base set of waf rules that everything else pulls in first
 
-import sys, wafsamba, Configure
-import Options, os, preproc
-from samba_utils import *
+import os, sys
+import wafsamba, Configure, Logs, Options, Utils
+from samba_utils import os_path_relpath
 from optparse import SUPPRESS_HELP
 
 # this forces configure to be re-run if any of the configure
@@ -27,42 +27,61 @@ def set_options(opt):
                    help=("comma separated list of bundled libraries. May include !LIBNAME to disable bundling a library. Can be 'NONE' or 'ALL' [auto]"),
                    action="store", dest='BUNDLED_LIBS', default='')
 
-    extension_default = Options.options['BUNDLED_EXTENSION_DEFAULT']
-    gr.add_option('--bundled-library-extension',
-                   help=("name extension for bundled libraries [%s]" % extension_default),
-                   action="store", dest='BUNDLED_EXTENSION', default=extension_default)
+    gr.add_option('--private-libraries',
+                   help=("comma separated list of normally public libraries to build instead as private libraries. May include !LIBNAME to disable making a library private. Can be 'NONE' or 'ALL' [auto]"),
+                   action="store", dest='PRIVATE_LIBS', default='')
 
-    extension_exception = Options.options['BUNDLED_EXTENSION_EXCEPTION']
-    gr.add_option('--bundled-extension-exception',
-                   help=("comman separated list of libraries to not apply extension to [%s]" % extension_exception),
-                   action="store", dest='BUNDLED_EXTENSION_EXCEPTION', default=extension_exception)
+    extension_default = Options.options['PRIVATE_EXTENSION_DEFAULT']
+    gr.add_option('--private-library-extension',
+                   help=("name extension for private libraries [%s]" % extension_default),
+                   action="store", dest='PRIVATE_EXTENSION', default=extension_default)
 
-    builtin_defauilt = Options.options['BUILTIN_LIBRARIES_DEFAULT']
+    extension_exception = Options.options['PRIVATE_EXTENSION_EXCEPTION']
+    gr.add_option('--private-extension-exception',
+                   help=("comma separated list of libraries to not apply extension to [%s]" % extension_exception),
+                   action="store", dest='PRIVATE_EXTENSION_EXCEPTION', default=extension_exception)
+
+    builtin_default = Options.options['BUILTIN_LIBRARIES_DEFAULT']
     gr.add_option('--builtin-libraries',
-                   help=("command separated list of libraries to build directly into binaries [%s]" % builtin_defauilt),
-                   action="store", dest='BUILTIN_LIBRARIES', default=builtin_defauilt)
+                   help=("command separated list of libraries to build directly into binaries [%s]" % builtin_default),
+                   action="store", dest='BUILTIN_LIBRARIES', default=builtin_default)
 
     gr.add_option('--minimum-library-version',
                    help=("list of minimum system library versions (LIBNAME1:version,LIBNAME2:version)"),
                    action="store", dest='MINIMUM_LIBRARY_VERSION', default='')
 
-    gr.add_option('--disable-shared',
-                   help=("Disable all use of shared libraries"),
-                   action="store_true", dest='disable_shared', default=False)
     gr.add_option('--disable-rpath',
                    help=("Disable use of rpath for build binaries"),
                    action="store_true", dest='disable_rpath_build', default=False)
     gr.add_option('--disable-rpath-install',
-                   help=("Disable use of rpath for installed binaries"),
+                   help=("Disable use of rpath for library path in installed files"),
                    action="store_true", dest='disable_rpath_install', default=False)
+    gr.add_option('--disable-rpath-private-install',
+                   help=("Disable use of rpath for private library path in installed files"),
+                   action="store_true", dest='disable_rpath_private_install', default=False)
     gr.add_option('--nonshared-binary',
                    help=("Disable use of shared libs for the listed binaries"),
                    action="store", dest='NONSHARED_BINARIES', default='')
+    gr.add_option('--disable-symbol-versions',
+                   help=("Disable use of the --version-script linker option"),
+                   action="store_true", dest='disable_symbol_versions', default=False)
 
     opt.add_option('--with-modulesdir',
                    help=("modules directory [PREFIX/modules]"),
                    action="store", dest='MODULESDIR', default='${PREFIX}/modules')
 
+    opt.add_option('--with-privatelibdir',
+                   help=("private library directory [PREFIX/lib/%s]" % Utils.g_module.APPNAME),
+                   action="store", dest='PRIVATELIBDIR', default=None)
+
+    opt.add_option('--with-libiconv',
+                   help='additional directory to search for libiconv',
+                   action='store', dest='iconv_open', default='/usr/local',
+                   match = ['Checking for library iconv', 'Checking for iconv_open', 'Checking for header iconv.h'])
+    opt.add_option('--without-gettext',
+                   help=("Disable use of gettext"),
+                   action="store_true", dest='disable_gettext', default=False)
+
     gr = opt.option_group('developer options')
 
     gr.add_option('-C',
@@ -71,12 +90,19 @@ def set_options(opt):
     gr.add_option('--enable-auto-reconfigure',
                    help='enable automatic reconfigure on build',
                    action='store_true', dest='enable_auto_reconfigure')
+    gr.add_option('--enable-debug',
+                   help=("Turn on debugging symbols"),
+                   action="store_true", dest='debug', default=False)
     gr.add_option('--enable-developer',
                    help=("Turn on developer warnings and debugging"),
                    action="store_true", dest='developer', default=False)
+    def picky_developer_callback(option, opt_str, value, parser):
+        parser.values.developer = True
+        parser.values.picky_developer = True
     gr.add_option('--picky-developer',
                    help=("Treat all warnings as errors (enable -Werror)"),
-                   action="store_true", dest='picky_developer', default=False)
+                   action="callback", callback=picky_developer_callback,
+                   dest='picky_developer', default=False)
     gr.add_option('--fatal-errors',
                    help=("Stop compilation on first error (enable -Wfatal-errors)"),
                    action="store_true", dest='fatal_errors', default=False)
@@ -89,6 +115,12 @@ def set_options(opt):
     gr.add_option('--pedantic',
                   help=("Enable even more compiler warnings"),
                   action='store_true', dest='pedantic', default=False)
+    gr.add_option('--git-local-changes',
+                  help=("mark version with + if local git changes"),
+                  action='store_true', dest='GIT_LOCAL_CHANGES', default=False)
+    gr.add_option('--address-sanitizer',
+                   help=("Enable address sanitizer compile and linker flags"),
+                   action="store_true", dest='address_sanitizer', default=False)
 
     gr.add_option('--abi-check',
                   help=("Check ABI signatures for libraries"),
@@ -100,6 +132,26 @@ def set_options(opt):
                   help=("Update ABI signature files for libraries"),
                   action='store_true', dest='ABI_UPDATE', default=False)
 
+    gr.add_option('--show-deps',
+                  help=("Show dependency tree for the given target"),
+                  dest='SHOWDEPS', default='')
+
+    gr.add_option('--symbol-check',
+                  help=("check symbols in object files against project rules"),
+                  action='store_true', dest='SYMBOLCHECK', default=False)
+
+    gr.add_option('--dup-symbol-check',
+                  help=("check for duplicate symbols in object files and system libs (must be configured with --enable-developer)"),
+                  action='store_true', dest='DUP_SYMBOLCHECK', default=False)
+
+    gr.add_option('--why-needed',
+                  help=("TARGET:DEPENDENCY check why TARGET needs DEPENDENCY"),
+                  action='store', type='str', dest='WHYNEEDED', default=None)
+
+    gr.add_option('--show-duplicates',
+                  help=("Show objects which are included in multiple binaries or libraries"),
+                  action='store_true', dest='SHOW_DUPLICATES', default=False)
+
     gr = opt.add_option_group('cross compilation options')
 
     gr.add_option('--cross-compile',
@@ -123,12 +175,18 @@ def set_options(opt):
     opt.add_option('--host',
                   help=SUPPRESS_HELP,
                   action='store', dest='AUTOCONF_HOST', default='')
+    opt.add_option('--target',
+                  help=SUPPRESS_HELP,
+                  action='store', dest='AUTOCONF_TARGET', default='')
     opt.add_option('--program-prefix',
                   help=SUPPRESS_HELP,
                   action='store', dest='AUTOCONF_PROGRAM_PREFIX', default='')
     opt.add_option('--disable-dependency-tracking',
                   help=SUPPRESS_HELP,
                   action='store_true', dest='AUTOCONF_DISABLE_DEPENDENCY_TRACKING', default=False)
+    opt.add_option('--disable-silent-rules',
+                  help=SUPPRESS_HELP,
+                  action='store_true', dest='AUTOCONF_DISABLE_SILENT_RULES', default=False)
 
     gr = opt.option_group('dist options')
     gr.add_option('--sign-release',
@@ -138,8 +196,14 @@ def set_options(opt):
                    help='tag release in git at the same time',
                    type='string', action='store', dest='TAG_RELEASE')
 
+    opt.add_option('--extra-python', type=str,
+                    help=("build selected libraries for the specified "
+                          "additional version of Python "
+                          "(example: --extra-python=/usr/bin/python3)"),
+                    metavar="PYTHON", dest='EXTRA_PYTHON', default=None)
 
-@wafsamba.runonce
+
+@Utils.run_once
 def configure(conf):
     conf.env.hlist = []
     conf.env.srcdir = conf.srcdir
@@ -152,16 +216,24 @@ def configure(conf):
     # load our local waf extensions
     conf.check_tool('gnu_dirs')
     conf.check_tool('wafsamba')
+    conf.check_tool('print_commands')
 
     conf.CHECK_CC_ENV()
 
     conf.check_tool('compiler_cc')
 
+    conf.CHECK_STANDARD_LIBPATH()
+
     # we need git for 'waf dist'
     conf.find_program('git', var='GIT')
 
     # older gcc versions (< 4.4) does not work with gccdeps, so we have to see if the .d file is generated
     if Options.options.enable_gccdeps:
+        # stale file removal - the configuration may pick up the old .pyc file
+        p = os.path.join(conf.srcdir, 'buildtools/wafsamba/gccdeps.pyc')
+        if os.path.exists(p):
+            os.remove(p)
+
         from TaskGen import feature, after
         @feature('testd')
         @after('apply_core')
@@ -176,7 +248,7 @@ def configure(conf):
         cc.run = Task.compile_fun_noshell('cc', '${CC} ${CCFLAGS} ${CPPFLAGS} ${_CCINCFLAGS} ${_CCDEFFLAGS} ${CC_SRC_F}${SRC} ${CC_TGT_F}${TGT[0].abspath(env)}')[0]
         try:
             try:
-                conf.check(features='cc testd', fragment='int main() {return 0;}\n', ccflags=['-MD'], mandatory=True, msg='Check for -MD')
+                conf.check(features='c testd', fragment='int main() {return 0;}\n', ccflags=['-MD'], mandatory=True, msg='Check for -MD')
             except:
                 pass
             else:
@@ -189,13 +261,14 @@ def configure(conf):
     conf.env.BINDIR = Options.options.BINDIR or '${PREFIX}/bin'
     conf.env.SBINDIR = Options.options.SBINDIR or '${PREFIX}/sbin'
     conf.env.MODULESDIR = Options.options.MODULESDIR
+    conf.env.PRIVATELIBDIR = Options.options.PRIVATELIBDIR
     conf.env.BUNDLED_LIBS = Options.options.BUNDLED_LIBS.split(',')
+    conf.env.PRIVATE_LIBS = Options.options.PRIVATE_LIBS.split(',')
     conf.env.BUILTIN_LIBRARIES = Options.options.BUILTIN_LIBRARIES.split(',')
-    conf.env.DISABLE_SHARED = Options.options.disable_shared
     conf.env.NONSHARED_BINARIES = Options.options.NONSHARED_BINARIES.split(',')
 
-    conf.env.BUNDLED_EXTENSION = Options.options.BUNDLED_EXTENSION
-    conf.env.BUNDLED_EXTENSION_EXCEPTION = Options.options.BUNDLED_EXTENSION_EXCEPTION.split(',')
+    conf.env.PRIVATE_EXTENSION = Options.options.PRIVATE_EXTENSION
+    conf.env.PRIVATE_EXTENSION_EXCEPTION = Options.options.PRIVATE_EXTENSION_EXCEPTION.split(',')
 
     conf.env.CROSS_COMPILE = Options.options.CROSS_COMPILE
     conf.env.CROSS_EXECUTE = Options.options.CROSS_EXECUTE
@@ -206,6 +279,8 @@ def configure(conf):
     conf.env.AUTOCONF_HOST  = Options.options.AUTOCONF_HOST
     conf.env.AUTOCONF_PROGRAM_PREFIX = Options.options.AUTOCONF_PROGRAM_PREFIX
 
+    conf.env.EXTRA_PYTHON = Options.options.EXTRA_PYTHON
+
     if (conf.env.AUTOCONF_HOST and
         conf.env.AUTOCONF_BUILD and
         conf.env.AUTOCONF_BUILD != conf.env.AUTOCONF_HOST):
@@ -224,6 +299,8 @@ def configure(conf):
     except:
         conf.env.ABI_CHECK = False
 
+    conf.env.GIT_LOCAL_CHANGES = Options.options.GIT_LOCAL_CHANGES
+
     conf.CHECK_COMMAND(['uname', '-a'],
                        msg='Checking build system',
                        define='BUILD_SYSTEM',
@@ -238,39 +315,180 @@ def configure(conf):
                     headers='stdio.h',
                     msg='Checking simple C program')
 
-    # see if we can build shared libs
-    if not conf.CHECK_LIBRARY_SUPPORT():
-        conf.env.DISABLE_SHARED = True
+    # Try to find the right extra flags for -Werror behaviour
+    for f in ["-Werror",       # GCC
+              "-errwarn=%all", # Sun Studio
+              "-qhalt=w",     # IBM xlc
+              "-w2",           # Tru64
+             ]:
+        if conf.CHECK_CFLAGS([f], '''
+'''):
+            if not 'WERROR_CFLAGS' in conf.env:
+                conf.env['WERROR_CFLAGS'] = []
+            conf.env['WERROR_CFLAGS'].extend([f])
+            break
+
+    # check which compiler/linker flags are needed for rpath support
+    if not conf.CHECK_LDFLAGS(['-Wl,-rpath,.']) and conf.CHECK_LDFLAGS(['-Wl,-R,.']):
+        conf.env['RPATH_ST'] = '-Wl,-R,%s'
 
     # check for rpath
-    if not conf.env.DISABLE_SHARED and conf.CHECK_LIBRARY_SUPPORT(rpath=True):
+    if conf.CHECK_LIBRARY_SUPPORT(rpath=True):
+        support_rpath = True
         conf.env.RPATH_ON_BUILD   = not Options.options.disable_rpath_build
         conf.env.RPATH_ON_INSTALL = (conf.env.RPATH_ON_BUILD and
                                      not Options.options.disable_rpath_install)
+        if not conf.env.PRIVATELIBDIR:
+            conf.env.PRIVATELIBDIR = '%s/%s' % (conf.env.LIBDIR, Utils.g_module.APPNAME)
+        conf.env.RPATH_ON_INSTALL_PRIVATE = (
+            not Options.options.disable_rpath_private_install)
     else:
+        support_rpath = False
         conf.env.RPATH_ON_INSTALL = False
         conf.env.RPATH_ON_BUILD   = False
+        conf.env.RPATH_ON_INSTALL_PRIVATE = False
+        if not conf.env.PRIVATELIBDIR:
+            # rpath is not possible so there is no sense in having a
+            # private library directory by default.
+            # the user can of course always override it.
+            conf.env.PRIVATELIBDIR = conf.env.LIBDIR
+
+    if (not Options.options.disable_symbol_versions and
+        conf.CHECK_LIBRARY_SUPPORT(rpath=support_rpath,
+                                   version_script=True,
+                                   msg='-Wl,--version-script support')):
+        conf.env.HAVE_LD_VERSION_SCRIPT = True
+    else:
+        conf.env.HAVE_LD_VERSION_SCRIPT = False
+
+    if conf.CHECK_CFLAGS(['-fvisibility=hidden'] + conf.env.WERROR_CFLAGS):
+        conf.env.VISIBILITY_CFLAGS = '-fvisibility=hidden'
+        conf.CHECK_CODE('''int main(void) { return 0; }
+                           __attribute__((visibility("default"))) void vis_foo2(void) {}''',
+                        cflags=conf.env.VISIBILITY_CFLAGS,
+                        define='HAVE_VISIBILITY_ATTR', addmain=False)
+
+    # check HAVE_CONSTRUCTOR_ATTRIBUTE
+    conf.CHECK_CODE('''
+            void test_constructor_attribute(void) __attribute__ ((constructor));
+
+            void test_constructor_attribute(void)
+            {
+                return;
+            }
+
+            int main(void) {
+                return 0;
+            }
+            ''',
+            'HAVE_CONSTRUCTOR_ATTRIBUTE',
+            addmain=False,
+            msg='Checking for library constructor support')
+
+        # check HAVE_DESTRUCTOR_ATTRIBUTE
+    conf.CHECK_CODE('''
+            void test_destructor_attribute(void) __attribute__ ((destructor));
+
+            void test_destructor_attribute(void)
+            {
+                return;
+            }
+
+            int main(void) {
+                return 0;
+            }
+            ''',
+            'HAVE_DESTRUCTOR_ATTRIBUTE',
+            addmain=False,
+            msg='Checking for library destructor support')
+
+    conf.CHECK_CODE('''
+            void test_attribute(void) __attribute__ (());
+
+            void test_attribute(void)
+            {
+                return;
+            }
+
+            int main(void) {
+                return 0;
+            }
+            ''',
+            'HAVE___ATTRIBUTE__',
+            addmain=False,
+            msg='Checking for __attribute__')
+
+    if sys.platform.startswith('aix'):
+        conf.DEFINE('_ALL_SOURCE', 1, add_to_cflags=True)
+        # Might not be needed if ALL_SOURCE is defined
+        # conf.DEFINE('_XOPEN_SOURCE', 600, add_to_cflags=True)
 
     # we should use the PIC options in waf instead
-    conf.ADD_CFLAGS('-fPIC', testflags=True)
+    # Some compilo didn't support -fPIC but just print a warning
+    if conf.env['COMPILER_CC'] == "suncc":
+        conf.ADD_CFLAGS('-KPIC', testflags=True)
+        # we really want define here as we need to have this
+        # define even during the tests otherwise detection of
+        # boolean is broken
+        conf.DEFINE('_STDC_C99', 1, add_to_cflags=True)
+        conf.DEFINE('_XPG6', 1, add_to_cflags=True)
+    else:
+        conf.ADD_CFLAGS('-fPIC', testflags=True)
+
+    # On Solaris 8 with suncc (at least) the flags for the linker to define the name of the
+    # library are not always working (if the command line is very very long and with a lot
+    # files)
+
+    if conf.env['COMPILER_CC'] == "suncc":
+        save = conf.env['SONAME_ST']
+        conf.env['SONAME_ST'] = '-Wl,-h,%s'
+        if not conf.CHECK_SHLIB_INTRASINC_NAME_FLAGS("Checking if flags %s are ok" % conf.env['SONAME_ST']):
+            conf.env['SONAME_ST'] = save
 
     conf.CHECK_INLINE()
 
     # check for pkgconfig
-    conf.check_cfg(atleast_pkgconfig_version='0.0.0')
+    conf.CHECK_CFG(atleast_pkgconfig_version='0.0.0')
 
     conf.DEFINE('_GNU_SOURCE', 1, add_to_cflags=True)
     conf.DEFINE('_XOPEN_SOURCE_EXTENDED', 1, add_to_cflags=True)
 
+    # on Tru64 certain features are only available with _OSF_SOURCE set to 1
+    # and _XOPEN_SOURCE set to 600
+    if conf.env['SYSTEM_UNAME_SYSNAME'] == 'OSF1':
+        conf.DEFINE('_OSF_SOURCE', 1, add_to_cflags=True)
+        conf.DEFINE('_XOPEN_SOURCE', 600, add_to_cflags=True)
+
+    # SCM_RIGHTS is only avail if _XOPEN_SOURCE iŃ• defined on IRIX
+    if conf.env['SYSTEM_UNAME_SYSNAME'] == 'IRIX':
+        conf.DEFINE('_XOPEN_SOURCE', 600, add_to_cflags=True)
+        conf.DEFINE('_BSD_TYPES', 1, add_to_cflags=True)
+
+    # Try to find the right extra flags for C99 initialisers
+    for f in ["", "-AC99", "-qlanglvl=extc99", "-qlanglvl=stdc99", "-c99"]:
+        if conf.CHECK_CFLAGS([f], '''
+struct foo {int x;char y;};
+struct foo bar = { .y = 'X', .x = 1 };
+'''):
+            if f != "":
+                conf.ADD_CFLAGS(f)
+            break
+
     # get the base headers we'll use for the rest of the tests
     conf.CHECK_HEADERS('stdio.h sys/types.h sys/stat.h stdlib.h stddef.h memory.h string.h',
                        add_headers=True)
     conf.CHECK_HEADERS('strings.h inttypes.h stdint.h unistd.h minix/config.h', add_headers=True)
-    conf.CHECK_HEADERS('ctype.h standards.h stdbool.h stdint.h stdarg.h vararg.h', add_headers=True)
+    conf.CHECK_HEADERS('ctype.h', add_headers=True)
+
+    if sys.platform != 'darwin':
+        conf.CHECK_HEADERS('standards.h', add_headers=True)
+
+    conf.CHECK_HEADERS('stdbool.h stdint.h stdarg.h vararg.h', add_headers=True)
     conf.CHECK_HEADERS('limits.h assert.h')
 
     # see if we need special largefile flags
-    conf.CHECK_LARGEFILE()
+    if not conf.CHECK_LARGEFILE():
+        raise Utils.WafError('Samba requires large file support support, but not available on this platform: sizeof(off_t) < 8')
 
     if 'HAVE_STDDEF_H' in conf.env and 'HAVE_STDLIB_H' in conf.env:
         conf.DEFINE('STDC_HEADERS', 1)
@@ -287,9 +505,68 @@ def configure(conf):
     else:
         conf.define('SHLIBEXT', "so", quote=True)
 
-    conf.CHECK_CODE('long one = 1; return ((char *)(&one))[0]',
-                    execute=True,
-                    define='WORDS_BIGENDIAN')
+    # First try a header check for cross-compile friendlyness
+    conf.CHECK_CODE(code = """#ifdef __BYTE_ORDER
+                        #define B __BYTE_ORDER
+                        #elif defined(BYTE_ORDER)
+                        #define B BYTE_ORDER
+                        #endif
+
+                        #ifdef __LITTLE_ENDIAN
+                        #define LITTLE __LITTLE_ENDIAN
+                        #elif defined(LITTLE_ENDIAN)
+                        #define LITTLE LITTLE_ENDIAN
+                        #endif
+
+                        #if !defined(LITTLE) || !defined(B) || LITTLE != B
+                        #error Not little endian.
+                        #endif
+                        int main(void) { return 0; }""",
+                            addmain=False,
+                            headers="endian.h sys/endian.h",
+                            define="HAVE_LITTLE_ENDIAN")
+    conf.CHECK_CODE(code = """#ifdef __BYTE_ORDER
+                        #define B __BYTE_ORDER
+                        #elif defined(BYTE_ORDER)
+                        #define B BYTE_ORDER
+                        #endif
+
+                        #ifdef __BIG_ENDIAN
+                        #define BIG __BIG_ENDIAN
+                        #elif defined(BIG_ENDIAN)
+                        #define BIG BIG_ENDIAN
+                        #endif
+
+                        #if !defined(BIG) || !defined(B) || BIG != B
+                        #error Not big endian.
+                        #endif
+                        int main(void) { return 0; }""",
+                            addmain=False,
+                            headers="endian.h sys/endian.h",
+                            define="HAVE_BIG_ENDIAN")
+
+    if not conf.CONFIG_SET("HAVE_BIG_ENDIAN") and not conf.CONFIG_SET("HAVE_LITTLE_ENDIAN"):
+        # That didn't work!  Do runtime test.
+        conf.CHECK_CODE("""union { int i; char c[sizeof(int)]; } u;
+            u.i = 0x01020304;
+            return u.c[0] == 0x04 && u.c[1] == 0x03 && u.c[2] == 0x02 && u.c[3] == 0x01 ? 0 : 1;""",
+                          addmain=True, execute=True,
+                          define='HAVE_LITTLE_ENDIAN',
+                          msg="Checking for HAVE_LITTLE_ENDIAN - runtime")
+        conf.CHECK_CODE("""union { int i; char c[sizeof(int)]; } u;
+            u.i = 0x01020304;
+            return u.c[0] == 0x01 && u.c[1] == 0x02 && u.c[2] == 0x03 && u.c[3] == 0x04 ? 0 : 1;""",
+                          addmain=True, execute=True,
+                          define='HAVE_BIG_ENDIAN',
+                          msg="Checking for HAVE_BIG_ENDIAN - runtime")
+
+    # Extra sanity check.
+    if conf.CONFIG_SET("HAVE_BIG_ENDIAN") == conf.CONFIG_SET("HAVE_LITTLE_ENDIAN"):
+        Logs.error("Failed endian determination.  The PDP-11 is back?")
+       sys.exit(1)
+    else:
+        if conf.CONFIG_SET("HAVE_BIG_ENDIAN"):
+            conf.DEFINE('WORDS_BIGENDIAN', 1)
 
     # check if signal() takes a void function
     if conf.CHECK_CODE('return *(signal (0, 0)) (0) == 1',