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samba-mirror/buildtools/wafsamba/samba_autoconf.py
Rusty Russell 3ccfe7cb7b Add -fno-common where supported (WAF only)
Normally under UNIX, uninitialized non-static global variables get
placed in the "common" section, where they are merged at link time.
This means if two C files define "int debug", they will end up
referring to the same variable.  Or if one does "float level" and the
other does "int level" you'll get an accidental union.

Such bugs can be hard to track down; fortunately GCC offers
-fno-common to disable this feature.  It didn't reveal any places
which need fixing, however).

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2011-05-10 11:37:30 +09:30

716 lines
22 KiB
Python

# a waf tool to add autoconf-like macros to the configure section
import Build, os, sys, Options, preproc, Logs
import string
from Configure import conf
from samba_utils import *
import samba_cross
missing_headers = set()
####################################################
# some autoconf like helpers, to make the transition
# to waf a bit easier for those used to autoconf
# m4 files
@runonce
@conf
def DEFINE(conf, d, v, add_to_cflags=False, quote=False):
'''define a config option'''
conf.define(d, v, quote=quote)
if add_to_cflags:
conf.env.append_value('CCDEFINES', d + '=' + str(v))
def hlist_to_string(conf, headers=None):
'''convert a headers list to a set of #include lines'''
hdrs=''
hlist = conf.env.hlist
if headers:
hlist = hlist[:]
hlist.extend(TO_LIST(headers))
for h in hlist:
hdrs += '#include <%s>\n' % h
return hdrs
@conf
def COMPOUND_START(conf, msg):
'''start a compound test'''
def null_check_message_1(self,*k,**kw):
return
def null_check_message_2(self,*k,**kw):
return
v = getattr(conf.env, 'in_compound', [])
if v != [] and v != 0:
conf.env.in_compound = v + 1
return
conf.check_message_1(msg)
conf.saved_check_message_1 = conf.check_message_1
conf.check_message_1 = null_check_message_1
conf.saved_check_message_2 = conf.check_message_2
conf.check_message_2 = null_check_message_2
conf.env.in_compound = 1
@conf
def COMPOUND_END(conf, result):
'''start a compound test'''
conf.env.in_compound -= 1
if conf.env.in_compound != 0:
return
conf.check_message_1 = conf.saved_check_message_1
conf.check_message_2 = conf.saved_check_message_2
p = conf.check_message_2
if result == True:
p('ok ')
elif result == False:
p('not found', 'YELLOW')
else:
p(result)
@feature('nolink')
def nolink(self):
'''using the nolink type in conf.check() allows us to avoid
the link stage of a test, thus speeding it up for tests
that where linking is not needed'''
pass
def CHECK_HEADER(conf, h, add_headers=False, lib=None):
'''check for a header'''
if h in missing_headers and lib is None:
return False
d = h.upper().replace('/', '_')
d = d.replace('.', '_')
d = d.replace('-', '_')
d = 'HAVE_%s' % d
if CONFIG_SET(conf, d):
if add_headers:
if not h in conf.env.hlist:
conf.env.hlist.append(h)
return True
(ccflags, ldflags) = library_flags(conf, lib)
hdrs = hlist_to_string(conf, headers=h)
ret = conf.check(fragment='%s\nint main(void) { return 0; }' % hdrs,
type='nolink',
execute=0,
ccflags=ccflags,
msg="Checking for header %s" % h)
if not ret:
missing_headers.add(h)
return False
conf.DEFINE(d, 1)
if add_headers and not h in conf.env.hlist:
conf.env.hlist.append(h)
return ret
@conf
def CHECK_HEADERS(conf, headers, add_headers=False, together=False, lib=None):
'''check for a list of headers
when together==True, then the headers accumulate within this test.
This is useful for interdependent headers
'''
ret = True
if not add_headers and together:
saved_hlist = conf.env.hlist[:]
set_add_headers = True
else:
set_add_headers = add_headers
for hdr in TO_LIST(headers):
if not CHECK_HEADER(conf, hdr, set_add_headers, lib=lib):
ret = False
if not add_headers and together:
conf.env.hlist = saved_hlist
return ret
def header_list(conf, headers=None, lib=None):
'''form a list of headers which exist, as a string'''
hlist=[]
if headers is not None:
for h in TO_LIST(headers):
if CHECK_HEADER(conf, h, add_headers=False, lib=lib):
hlist.append(h)
return hlist_to_string(conf, headers=hlist)
@conf
def CHECK_TYPE(conf, t, alternate=None, headers=None, define=None, lib=None, msg=None):
'''check for a single type'''
if define is None:
define = 'HAVE_' + t.upper().replace(' ', '_')
if msg is None:
msg='Checking for %s' % t
ret = CHECK_CODE(conf, '%s _x' % t,
define,
execute=False,
headers=headers,
local_include=False,
msg=msg,
lib=lib,
link=False)
if not ret and alternate:
conf.DEFINE(t, alternate)
return ret
@conf
def CHECK_TYPES(conf, list, headers=None, define=None, alternate=None, lib=None):
'''check for a list of types'''
ret = True
for t in TO_LIST(list):
if not CHECK_TYPE(conf, t, headers=headers,
define=define, alternate=alternate, lib=lib):
ret = False
return ret
@conf
def CHECK_TYPE_IN(conf, t, headers=None, alternate=None, define=None):
'''check for a single type with a header'''
return CHECK_TYPE(conf, t, headers=headers, alternate=alternate, define=define)
@conf
def CHECK_VARIABLE(conf, v, define=None, always=False,
headers=None, msg=None, lib=None):
'''check for a variable declaration (or define)'''
if define is None:
define = 'HAVE_%s' % v.upper()
if msg is None:
msg="Checking for variable %s" % v
return CHECK_CODE(conf,
# we need to make sure the compiler doesn't
# optimize it out...
'''
#ifndef %s
void *_x; _x=(void *)&%s; return (int)_x;
#endif
return 0
''' % (v, v),
execute=False,
link=False,
msg=msg,
local_include=False,
lib=lib,
headers=headers,
define=define,
always=always)
@conf
def CHECK_DECLS(conf, vars, reverse=False, headers=None, always=False):
'''check a list of variable declarations, using the HAVE_DECL_xxx form
of define
When reverse==True then use HAVE_xxx_DECL instead of HAVE_DECL_xxx
'''
ret = True
for v in TO_LIST(vars):
if not reverse:
define='HAVE_DECL_%s' % v.upper()
else:
define='HAVE_%s_DECL' % v.upper()
if not CHECK_VARIABLE(conf, v,
define=define,
headers=headers,
msg='Checking for declaration of %s' % v,
always=always):
ret = False
return ret
def CHECK_FUNC(conf, f, link=True, lib=None, headers=None):
'''check for a function'''
define='HAVE_%s' % f.upper()
ret = False
conf.COMPOUND_START('Checking for %s' % f)
if link is None or link == True:
ret = CHECK_CODE(conf,
# this is based on the autoconf strategy
'''
#define %s __fake__%s
#ifdef HAVE_LIMITS_H
# include <limits.h>
#else
# include <assert.h>
#endif
#undef %s
#if defined __stub_%s || defined __stub___%s
#error "bad glibc stub"
#endif
extern char %s();
int main() { return %s(); }
''' % (f, f, f, f, f, f, f),
execute=False,
link=True,
addmain=False,
add_headers=False,
define=define,
local_include=False,
lib=lib,
headers=headers,
msg='Checking for %s' % f)
if not ret:
ret = CHECK_CODE(conf,
# it might be a macro
# we need to make sure the compiler doesn't
# optimize it out...
'void *__x = (void *)%s; return (int)__x' % f,
execute=False,
link=True,
addmain=True,
add_headers=True,
define=define,
local_include=False,
lib=lib,
headers=headers,
msg='Checking for macro %s' % f)
if not ret and (link is None or link == False):
ret = CHECK_VARIABLE(conf, f,
define=define,
headers=headers,
msg='Checking for declaration of %s' % f)
conf.COMPOUND_END(ret)
return ret
@conf
def CHECK_FUNCS(conf, list, link=True, lib=None, headers=None):
'''check for a list of functions'''
ret = True
for f in TO_LIST(list):
if not CHECK_FUNC(conf, f, link=link, lib=lib, headers=headers):
ret = False
return ret
@conf
def CHECK_SIZEOF(conf, vars, headers=None, define=None):
'''check the size of a type'''
ret = True
for v in TO_LIST(vars):
v_define = define
if v_define is None:
v_define = 'SIZEOF_%s' % v.upper().replace(' ', '_')
if not CHECK_CODE(conf,
'printf("%%u", (unsigned)sizeof(%s))' % v,
define=v_define,
execute=True,
define_ret=True,
quote=False,
headers=headers,
local_include=False,
msg="Checking size of %s" % v):
ret = False
return ret
@conf
def CHECK_CODE(conf, code, define,
always=False, execute=False, addmain=True,
add_headers=True, mandatory=False,
headers=None, msg=None, cflags='', includes='# .',
local_include=True, lib=None, link=True,
define_ret=False, quote=False,
on_target=True):
'''check if some code compiles and/or runs'''
if CONFIG_SET(conf, define):
return True
if headers is not None:
CHECK_HEADERS(conf, headers=headers, lib=lib)
if add_headers:
hdrs = header_list(conf, headers=headers, lib=lib)
else:
hdrs = ''
if execute:
execute = 1
else:
execute = 0
defs = conf.get_config_header()
if addmain:
fragment='%s\n%s\n int main(void) { %s; return 0; }\n' % (defs, hdrs, code)
else:
fragment='%s\n%s\n%s\n' % (defs, hdrs, code)
if msg is None:
msg="Checking for %s" % define
cflags = TO_LIST(cflags)
if local_include:
cflags.append('-I%s' % conf.curdir)
if not link:
type='nolink'
else:
type='cprogram'
uselib = TO_LIST(lib)
(ccflags, ldflags) = library_flags(conf, uselib)
cflags.extend(ccflags)
if on_target:
exec_args = conf.SAMBA_CROSS_ARGS(msg=msg)
else:
exec_args = []
conf.COMPOUND_START(msg)
ret = conf.check(fragment=fragment,
execute=execute,
define_name = define,
mandatory = mandatory,
ccflags=cflags,
ldflags=ldflags,
includes=includes,
uselib=uselib,
type=type,
msg=msg,
quote=quote,
exec_args=exec_args,
define_ret=define_ret)
if not ret and CONFIG_SET(conf, define):
# sometimes conf.check() returns false, but it
# sets the define. Maybe a waf bug?
ret = True
if ret:
if not define_ret:
conf.DEFINE(define, 1)
conf.COMPOUND_END(True)
else:
conf.COMPOUND_END(conf.env[define])
return True
if always:
conf.DEFINE(define, 0)
conf.COMPOUND_END(False)
return False
@conf
def CHECK_STRUCTURE_MEMBER(conf, structname, member,
always=False, define=None, headers=None):
'''check for a structure member'''
if define is None:
define = 'HAVE_%s' % member.upper()
return CHECK_CODE(conf,
'%s s; void *_x; _x=(void *)&s.%s' % (structname, member),
define,
execute=False,
link=False,
always=always,
headers=headers,
local_include=False,
msg="Checking for member %s in %s" % (member, structname))
@conf
def CHECK_CFLAGS(conf, cflags):
'''check if the given cflags are accepted by the compiler
'''
return conf.check(fragment='int main(void) { return 0; }\n',
execute=0,
type='nolink',
ccflags=cflags,
msg="Checking compiler accepts %s" % cflags)
@conf
def CHECK_LDFLAGS(conf, ldflags):
'''check if the given ldflags are accepted by the linker
'''
return conf.check(fragment='int main(void) { return 0; }\n',
execute=0,
ldflags=ldflags,
msg="Checking linker accepts %s" % ldflags)
@conf
def CONFIG_GET(conf, option):
'''return True if a configuration option was found'''
if (option in conf.env):
return conf.env[option]
else:
return None
@conf
def CONFIG_SET(conf, option):
'''return True if a configuration option was found'''
return (option in conf.env) and (conf.env[option] != ())
Build.BuildContext.CONFIG_SET = CONFIG_SET
Build.BuildContext.CONFIG_GET = CONFIG_GET
def library_flags(self, libs):
'''work out flags from pkg_config'''
ccflags = []
ldflags = []
for lib in TO_LIST(libs):
inc_path = getattr(self.env, 'CPPPATH_%s' % lib.upper(), [])
lib_path = getattr(self.env, 'LIBPATH_%s' % lib.upper(), [])
ccflags.extend(['-I%s' % i for i in inc_path])
ldflags.extend(['-L%s' % l for l in lib_path])
extra_ccflags = TO_LIST(getattr(self.env, 'CCFLAGS_%s' % lib.upper(), []))
extra_ldflags = TO_LIST(getattr(self.env, 'LDFLAGS_%s' % lib.upper(), []))
ccflags.extend(extra_ccflags)
ldflags.extend(extra_ldflags)
if 'EXTRA_LDFLAGS' in self.env:
ldflags.extend(self.env['EXTRA_LDFLAGS'])
ccflags = unique_list(ccflags)
ldflags = unique_list(ldflags)
return (ccflags, ldflags)
@conf
def CHECK_LIB(conf, libs, mandatory=False, empty_decl=True, set_target=True, shlib=False):
'''check if a set of libraries exist as system libraries
returns the sublist of libs that do exist as a syslib or []
'''
fragment= '''
int foo()
{
int v = 2;
return v*2;
}
'''
ret = []
liblist = TO_LIST(libs)
for lib in liblist[:]:
if GET_TARGET_TYPE(conf, lib) == 'SYSLIB':
ret.append(lib)
continue
(ccflags, ldflags) = library_flags(conf, lib)
if shlib:
res = conf.check(features='cc cshlib', fragment=fragment, lib=lib, uselib_store=lib, ccflags=ccflags, ldflags=ldflags)
else:
res = conf.check(lib=lib, uselib_store=lib, ccflags=ccflags, ldflags=ldflags)
if not res:
if mandatory:
Logs.error("Mandatory library '%s' not found for functions '%s'" % (lib, list))
sys.exit(1)
if empty_decl:
# if it isn't a mandatory library, then remove it from dependency lists
if set_target:
SET_TARGET_TYPE(conf, lib, 'EMPTY')
else:
conf.define('HAVE_LIB%s' % lib.upper().replace('-','_'), 1)
conf.env['LIB_' + lib.upper()] = lib
if set_target:
conf.SET_TARGET_TYPE(lib, 'SYSLIB')
ret.append(lib)
return ret
@conf
def CHECK_FUNCS_IN(conf, list, library, mandatory=False, checklibc=False,
headers=None, link=True, empty_decl=True, set_target=True):
"""
check that the functions in 'list' are available in 'library'
if they are, then make that library available as a dependency
if the library is not available and mandatory==True, then
raise an error.
If the library is not available and mandatory==False, then
add the library to the list of dependencies to remove from
build rules
optionally check for the functions first in libc
"""
remaining = TO_LIST(list)
liblist = TO_LIST(library)
# check if some already found
for f in remaining[:]:
if CONFIG_SET(conf, 'HAVE_%s' % f.upper()):
remaining.remove(f)
# see if the functions are in libc
if checklibc:
for f in remaining[:]:
if CHECK_FUNC(conf, f, link=True, headers=headers):
remaining.remove(f)
if remaining == []:
for lib in liblist:
if GET_TARGET_TYPE(conf, lib) != 'SYSLIB' and empty_decl:
SET_TARGET_TYPE(conf, lib, 'EMPTY')
return True
checklist = conf.CHECK_LIB(liblist, empty_decl=empty_decl, set_target=set_target)
for lib in liblist[:]:
if not lib in checklist and mandatory:
Logs.error("Mandatory library '%s' not found for functions '%s'" % (lib, list))
sys.exit(1)
ret = True
for f in remaining:
if not CHECK_FUNC(conf, f, lib=' '.join(checklist), headers=headers, link=link):
ret = False
return ret
@conf
def IN_LAUNCH_DIR(conf):
'''return True if this rule is being run from the launch directory'''
return os.path.realpath(conf.curdir) == os.path.realpath(Options.launch_dir)
Options.Handler.IN_LAUNCH_DIR = IN_LAUNCH_DIR
@conf
def SAMBA_CONFIG_H(conf, path=None):
'''write out config.h in the right directory'''
# we don't want to produce a config.h in places like lib/replace
# when we are building projects that depend on lib/replace
if not IN_LAUNCH_DIR(conf):
return
if Options.options.developer:
# we add these here to ensure that -Wstrict-prototypes is not set during configure
conf.ADD_CFLAGS('-Wall -g -Wshadow -Wstrict-prototypes -Wpointer-arith -Wcast-align -Wwrite-strings -Werror-implicit-function-declaration -Wformat=2 -Wno-format-y2k -Wmissing-prototypes -fno-common',
testflags=True)
if os.getenv('TOPLEVEL_BUILD'):
conf.ADD_CFLAGS('-Wcast-qual', testflags=True)
conf.env.DEVELOPER_MODE = True
if Options.options.picky_developer:
conf.ADD_CFLAGS('-Werror', testflags=True)
if Options.options.fatal_errors:
conf.ADD_CFLAGS('-Wfatal-errors', testflags=True)
if Options.options.pedantic:
conf.ADD_CFLAGS('-W', testflags=True)
if path is None:
conf.write_config_header('config.h', top=True)
else:
conf.write_config_header(path)
conf.SAMBA_CROSS_CHECK_COMPLETE()
@conf
def CONFIG_PATH(conf, name, default):
'''setup a configurable path'''
if not name in conf.env:
if default[0] == '/':
conf.env[name] = default
else:
conf.env[name] = conf.env['PREFIX'] + default
@conf
def ADD_CFLAGS(conf, flags, testflags=False):
'''add some CFLAGS to the command line
optionally set testflags to ensure all the flags work
'''
if testflags:
ok_flags=[]
for f in flags.split():
if CHECK_CFLAGS(conf, f):
ok_flags.append(f)
flags = ok_flags
if not 'EXTRA_CFLAGS' in conf.env:
conf.env['EXTRA_CFLAGS'] = []
conf.env['EXTRA_CFLAGS'].extend(TO_LIST(flags))
@conf
def ADD_LDFLAGS(conf, flags, testflags=False):
'''add some LDFLAGS to the command line
optionally set testflags to ensure all the flags work
this will return the flags that are added, if any
'''
if testflags:
ok_flags=[]
for f in flags.split():
if CHECK_LDFLAGS(conf, f):
ok_flags.append(f)
flags = ok_flags
if not 'EXTRA_LDFLAGS' in conf.env:
conf.env['EXTRA_LDFLAGS'] = []
conf.env['EXTRA_LDFLAGS'].extend(TO_LIST(flags))
return flags
@conf
def ADD_EXTRA_INCLUDES(conf, includes):
'''add some extra include directories to all builds'''
if not 'EXTRA_INCLUDES' in conf.env:
conf.env['EXTRA_INCLUDES'] = []
conf.env['EXTRA_INCLUDES'].extend(TO_LIST(includes))
def CURRENT_CFLAGS(bld, target, cflags, hide_symbols=False):
'''work out the current flags. local flags are added first'''
if not 'EXTRA_CFLAGS' in bld.env:
list = []
else:
list = bld.env['EXTRA_CFLAGS'];
ret = TO_LIST(cflags)
ret.extend(list)
if hide_symbols and bld.env.HAVE_VISIBILITY_ATTR:
ret.append('-fvisibility=hidden')
return ret
@conf
def CHECK_CC_ENV(conf):
"""trim whitespaces from 'CC'.
The build farm sometimes puts a space at the start"""
if os.environ.get('CC'):
conf.env.CC = TO_LIST(os.environ.get('CC'))
if len(conf.env.CC) == 1:
# make for nicer logs if just a single command
conf.env.CC = conf.env.CC[0]
@conf
def SETUP_CONFIGURE_CACHE(conf, enable):
'''enable/disable cache of configure results'''
if enable:
# when -C is chosen, we will use a private cache and will
# not look into system includes. This roughtly matches what
# autoconf does with -C
cache_path = os.path.join(conf.blddir, '.confcache')
mkdir_p(cache_path)
Options.cache_global = os.environ['WAFCACHE'] = cache_path
else:
# when -C is not chosen we will not cache configure checks
# We set the recursion limit low to prevent waf from spending
# a lot of time on the signatures of the files.
Options.cache_global = os.environ['WAFCACHE'] = ''
preproc.recursion_limit = 1
# in either case we don't need to scan system includes
preproc.go_absolute = False