Browse Source

[scons] wrap Configure in local Autoconf class

personal/stbuehler/cleanup-build
Stefan Bühler 4 years ago
committed by Glenn Strauss
parent
commit
42704e312e
  1. 439
      SConstruct

439
SConstruct

@ -8,38 +8,131 @@ from stat import *
package = 'lighttpd'
version = '1.4.48'
underscorify_reg = re.compile('[^A-Z0-9]')
def underscorify(id):
return underscorify_reg.sub('_', id.upper())
def fail(*args, **kwargs):
print(*args, file=sys.stderr, **kwargs)
env.Exit(-1)
def checkCHeaders(autoconf, hdrs):
p = re.compile('[^A-Z0-9]')
for hdr in hdrs:
if not hdr:
continue
_hdr = Split(hdr)
if autoconf.CheckCHeader(_hdr):
autoconf.env.Append(CPPFLAGS = [ '-DHAVE_' + p.sub('_', _hdr[-1].upper()) ])
def checkFunc(autoconf, func, header):
p = re.compile('[^A-Z0-9]')
if autoconf.CheckFunc(func, header):
autoconf.env.Append(CPPFLAGS = [ '-DHAVE_' + p.sub('_', func.upper()) ])
def checkFuncs(autoconf, funcs):
p = re.compile('[^A-Z0-9]')
for func in funcs:
if autoconf.CheckFunc(func):
autoconf.env.Append(CPPFLAGS = [ '-DHAVE_' + p.sub('_', func.upper()) ])
def checkTypes(autoconf, types):
p = re.compile('[^A-Z0-9]')
for type in types:
if autoconf.CheckType(type, '#include <sys/types.h>'):
autoconf.env.Append(CPPFLAGS = [ '-DHAVE_' + p.sub('_', type.upper()) ])
def checkGmtOffInStructTm(context):
source = """
class Autoconf:
class RestoreEnvLibs:
def __init__(self, env):
self.env = env
self.active = False
def __enter__(self):
if self.active:
raise Exception('entered twice')
self.active = True
if 'LIBS' in self.env:
#print("Backup LIBS: " + repr(self.env['LIBS']))
self.empty = False
self.backup_libs = copy(self.env['LIBS'])
else:
#print("No LIBS to backup")
self.empty = True
def __exit__(self, type, value, traceback):
if not self.active:
raise Exception('exited twice')
self.active = False
if self.empty:
if 'LIBS' in self.env:
del self.env['LIBS']
else:
#print("Restoring LIBS, now: " + repr(self.env['LIBS']))
self.env['LIBS'] = self.backup_libs
#print("Restoring LIBS, to: " + repr(self.env['LIBS']))
def __init__(self, env):
self.conf = Configure(env, custom_tests = {
'CheckGmtOffInStructTm': Autoconf.__checkGmtOffInStructTm,
'CheckIPv6': Autoconf.__checkIPv6,
'CheckWeakSymbols': Autoconf.__checkWeakSymbols,
})
def append(self, *args, **kw):
return self.conf.env.Append(*args, **kw)
def Finish(self):
return self.conf.Finish()
@property
def env(self):
return self.conf.env
def restoreEnvLibs(self):
return Autoconf.RestoreEnvLibs(self.conf.env)
def CheckType(self, *args, **kw):
return self.conf.CheckType(*args, **kw)
def CheckLib(self, *args, **kw):
return self.conf.CheckLib(*args, autoadd = 0, **kw)
def CheckLibWithHeader(self, *args, **kw):
return self.conf.CheckLibWithHeader(*args, autoadd = 0, **kw)
def CheckGmtOffInStructTm(self):
return self.conf.CheckGmtOffInStructTm()
def CheckIPv6(self):
return self.conf.CheckIPv6()
def CheckWeakSymbols(self):
return self.conf.CheckWeakSymbols()
def CheckCHeader(self, hdr):
return self.conf.CheckCHeader(hdr)
def haveCHeader(self, hdr):
if self.CheckCHeader(hdr):
# if we have a list of headers define HAVE_ only for last one
target = hdr
if not isinstance(target, basestring):
target = target[-1]
self.conf.env.Append(CPPFLAGS = [ '-DHAVE_' + underscorify(target) ])
return True
return False
def haveCHeaders(self, hdrs):
for hdr in hdrs:
self.haveCHeader(hdr)
def CheckFunc(self, func, header = None, libs = []):
with self.restoreEnvLibs():
self.env.Append(LIBS = libs)
return self.conf.CheckFunc(func, header = header)
def CheckFuncInLib(self, func, lib):
return self.CheckFunc(func, libs = [lib])
def haveFuncInLib(self, func, lib):
if self.CheckFuncInLib(func, lib):
self.conf.env.Append(CPPFLAGS = [ '-DHAVE_' + underscorify(func) ])
return True
return False
def haveFunc(self, func, header = None, libs = []):
if self.CheckFunc(func, header = header, libs = libs):
self.conf.env.Append(CPPFLAGS = [ '-DHAVE_' + underscorify(func) ])
return True
return False
def haveFuncs(self, funcs):
for func in funcs:
self.haveFunc(func)
def haveTypes(self, types):
for type in types:
if self.conf.CheckType(type, '#include <sys/types.h>'):
self.conf.env.Append(CPPFLAGS = [ '-DHAVE_' + underscorify(type) ])
@staticmethod
def __checkGmtOffInStructTm(context):
source = """
#include <time.h>
int main() {
struct tm a;
@ -47,14 +140,15 @@ int main() {
return 0;
}
"""
context.Message('Checking for tm_gmtoff in struct tm...')
result = context.TryLink(source, '.c')
context.Result(result)
context.Message('Checking for tm_gmtoff in struct tm...')
result = context.TryLink(source, '.c')
context.Result(result)
return result
return result
def checkIPv6(context):
source = """
@staticmethod
def __checkIPv6(context):
source = """
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
@ -64,48 +158,49 @@ int main() {
return 0;
}
"""
context.Message('Checking for IPv6 support...')
result = context.TryLink(source, '.c')
context.Result(result)
context.Message('Checking for IPv6 support...')
result = context.TryLink(source, '.c')
context.Result(result)
return result
return result
def checkWeakSymbols(context):
source = """
@staticmethod
def __checkWeakSymbols(context):
source = """
__attribute__((weak)) void __dummy(void *x) { }
int main() {
void *x;
__dummy(x);
}
"""
context.Message('Checking for weak symbol support...')
result = context.TryLink(source, '.c')
context.Result(result)
context.Message('Checking for weak symbol support...')
result = context.TryLink(source, '.c')
context.Result(result)
return result
return result
def checkProgram(env, withname, progname):
withname = 'with_' + withname
binpath = None
def checkProgram(self, withname, progname):
withname = 'with_' + withname
binpath = None
if env[withname] != 1:
binpath = env[withname]
else:
prog = env.Detect(progname)
if prog:
binpath = env.WhereIs(prog)
if self.env[withname] != 1:
binpath = self.env[withname]
else:
prog = self.env.Detect(progname)
if prog:
binpath = self.env.WhereIs(prog)
if binpath:
mode = os.stat(binpath)[ST_MODE]
if S_ISDIR(mode):
fail("* error: path `%s' is a directory" % (binpath))
if not S_ISREG(mode):
fail("* error: path `%s' is not a file or not exists" % (binpath))
if binpath:
mode = os.stat(binpath)[ST_MODE]
if S_ISDIR(mode):
fail("* error: path `%s' is a directory" % (binpath))
if not S_ISREG(mode):
fail("* error: path `%s' is not a file or not exists" % (binpath))
if not binpath:
fail("* error: can't find program `%s'" % (progname))
if not binpath:
fail("* error: can't find program `%s'" % (progname))
return binpath
return binpath
VariantDir('sconsbuild/build', 'src', duplicate = 0)
VariantDir('sconsbuild/tests', 'tests', duplicate = 0)
@ -181,11 +276,7 @@ if env['with_all']:
# cache configure checks
if 1:
autoconf = Configure(env, custom_tests = {
'CheckGmtOffInStructTm': checkGmtOffInStructTm,
'CheckIPv6': checkIPv6,
'CheckWeakSymbols': checkWeakSymbols,
})
autoconf = Autoconf(env)
if 'CFLAGS' in os.environ:
autoconf.env.Append(CCFLAGS = os.environ['CFLAGS'])
@ -201,60 +292,62 @@ if 1:
else:
autoconf.env.Append(APPEND_LIBS = '')
autoconf.headerfile = "foo.h"
checkCHeaders(autoconf, string.split("""
arpa/inet.h
crypt.h
fcntl.h
getopt.h
inttypes.h
linux/random.h
netinet/in.h
poll.h
pwd.h
stdint.h
stdlib.h
string.h
strings.h
sys/devpoll.h
sys/epoll.h
sys/event.h
sys/filio.h
sys/mman.h
sys/poll.h
sys/port.h
sys/prctl.h
sys/resource.h
sys/select.h
sys/sendfile.h
sys/socket.h
sys/time.h
sys/time.h sys/types.h sys/resource.h
sys/types.h netinet/in.h
sys/types.h sys/event.h
sys/types.h sys/mman.h
sys/types.h sys/select.h
sys/types.h sys/socket.h
sys/types.h sys/uio.h
sys/types.h sys/un.h
sys/uio.h
sys/un.h
sys/wait.h
syslog.h
unistd.h
winsock2.h""", "\n"))
checkFuncs(autoconf, Split('fork stat lstat strftime dup2 getcwd inet_ntoa inet_ntop memset mmap munmap strchr \
autoconf.haveCHeaders([
'arpa/inet.h',
'crypt.h',
'fcntl.h',
'getopt.h',
'inttypes.h',
'linux/random.h',
'netinet/in.h',
'poll.h',
'pwd.h',
'stdint.h',
'stdlib.h',
'string.h',
'strings.h',
'sys/devpoll.h',
'sys/epoll.h',
'sys/event.h',
'sys/filio.h',
'sys/mman.h',
'sys/poll.h',
'sys/port.h',
'sys/prctl.h',
'sys/resource.h',
'sys/select.h',
'sys/sendfile.h',
'sys/socket.h',
'sys/time.h',
'sys/uio.h',
'sys/un.h',
'sys/wait.h',
'syslog.h',
'unistd.h',
'winsock2.h',
# "have" the last header if we include others before?
['sys/time.h', 'sys/types.h', 'sys/resource.h'],
['sys/types.h', 'netinet/in.h'],
['sys/types.h', 'sys/event.h'],
['sys/types.h', 'sys/mman.h'],
['sys/types.h', 'sys/select.h'],
['sys/types.h', 'sys/socket.h'],
['sys/types.h', 'sys/uio.h'],
['sys/types.h', 'sys/un.h'],
])
autoconf.haveFuncs(Split('fork stat lstat strftime dup2 getcwd inet_ntoa inet_ntop memset mmap munmap strchr \
strdup strerror strstr strtol sendfile getopt socket \
gethostbyname poll epoll_ctl getrlimit chroot \
getuid select signal pathconf madvise prctl\
writev sigaction sendfile64 send_file kqueue port_create localtime_r posix_fadvise issetugid inet_pton \
memset_s explicit_bzero clock_gettime pipe2 \
arc4random_buf jrand48 srandom getloadavg'))
checkFunc(autoconf, 'getentropy', 'sys/random.h')
checkFunc(autoconf, 'getrandom', 'linux/random.h')
autoconf.haveFunc('getentropy', 'sys/random.h')
autoconf.haveFunc('getrandom', 'linux/random.h')
checkTypes(autoconf, Split('pid_t size_t off_t'))
autoconf.haveTypes(Split('pid_t size_t off_t'))
autoconf.env.Append( LIBSQLITE3 = '', LIBXML2 = '', LIBMYSQL = '', LIBZ = '',
LIBPGSQL = '', LIBDBI = '',
@ -263,14 +356,13 @@ if 1:
LIBKRB5 = '', LIBGSSAPI_KRB5 = '', LIBGDBM = '', LIBSSL = '', LIBCRYPTO = '')
# have crypt_r/crypt, and is -lcrypt needed?
if autoconf.CheckLib('crypt', autoadd = 0):
if autoconf.CheckLib('crypt'):
autoconf.env.Append(CPPFLAGS = [ '-DHAVE_LIBCRYPT' ], LIBCRYPT = 'crypt')
oldlib = env['LIBS']
env['LIBS'] = ['crypt']
checkFuncs(autoconf, ['crypt', 'crypt_r'])
env['LIBS'] = oldlib
with autoconf.restoreEnvLibs():
autoconf.env['LIBS'] = ['crypt']
autoconf.haveFuncs(['crypt', 'crypt_r'])
else:
checkFuncs(autoconf, ['crypt', 'crypt_r'])
autoconf.haveFuncs(['crypt', 'crypt_r'])
if autoconf.CheckType('socklen_t', '#include <unistd.h>\n#include <sys/socket.h>\n#include <sys/types.h>'):
autoconf.env.Append(CPPFLAGS = [ '-DHAVE_SOCKLEN_T' ])
@ -278,7 +370,7 @@ if 1:
if autoconf.CheckType('struct sockaddr_storage', '#include <sys/socket.h>\n'):
autoconf.env.Append(CPPFLAGS = [ '-DHAVE_STRUCT_SOCKADDR_STORAGE' ])
if autoconf.CheckLibWithHeader('rt', 'time.h', 'c', 'clock_gettime(CLOCK_MONOTONIC, (struct timespec*)0);', autoadd = 0):
if autoconf.CheckLibWithHeader('rt', 'time.h', 'c', 'clock_gettime(CLOCK_MONOTONIC, (struct timespec*)0);'):
autoconf.env.Append(CPPFLAGS = [ '-DHAVE_CLOCK_GETTIME' ], LIBS = [ 'rt' ])
if autoconf.CheckIPv6():
@ -290,132 +382,127 @@ if 1:
if autoconf.CheckGmtOffInStructTm():
autoconf.env.Append(CPPFLAGS = [ '-DHAVE_STRUCT_TM_GMTOFF' ])
if autoconf.CheckLibWithHeader('dl', 'dlfcn.h', 'C', autoadd = 0):
if autoconf.CheckLibWithHeader('dl', 'dlfcn.h', 'C'):
autoconf.env.Append(LIBDL = 'dl')
# used in tests if present
if autoconf.CheckLibWithHeader('fcgi', 'fastcgi.h', 'C', autoadd = 0):
if autoconf.CheckLibWithHeader('fcgi', 'fastcgi.h', 'C'):
autoconf.env.Append(LIBFCGI = 'fcgi')
if env['with_bzip2']:
if not autoconf.CheckLibWithHeader('bz2', 'bzlib.h', 'C', autoadd = 0):
if not autoconf.CheckLibWithHeader('bz2', 'bzlib.h', 'C'):
fail("Couldn't find bz2")
autoconf.env.Append(CPPFLAGS = [ '-DHAVE_BZLIB_H', '-DHAVE_LIBBZ2' ], LIBBZ2 = 'bz2')
if env['with_dbi']:
if not autoconf.CheckLibWithHeader('dbi', 'dbi/dbi.h', 'C', autoadd = 0):
if not autoconf.CheckLibWithHeader('dbi', 'dbi/dbi.h', 'C'):
fail("Couldn't find dbi")
env.Append(CPPFLAGS = [ '-DHAVE_DBI_H', '-DHAVE_LIBDBI' ], LIBDBI = 'dbi')
autoconf.env.Append(CPPFLAGS = [ '-DHAVE_DBI_H', '-DHAVE_LIBDBI' ], LIBDBI = 'dbi')
if env['with_fam']:
if not autoconf.CheckLibWithHeader('fam', 'fam.h', 'C', autoadd = 0):
if not autoconf.CheckLibWithHeader('fam', 'fam.h', 'C'):
fail("Couldn't find fam")
autoconf.env.Append(CPPFLAGS = [ '-DHAVE_FAM_H', '-DHAVE_LIBFAM' ], LIBS = [ 'fam' ])
checkFuncs(autoconf, ['FAMNoExists']);
autoconf.haveFunc('FAMNoExists')
if env['with_gdbm']:
if not autoconf.CheckLibWithHeader('gdbm', 'gdbm.h', 'C', autoadd = 0):
if not autoconf.CheckLibWithHeader('gdbm', 'gdbm.h', 'C'):
fail("Couldn't find gdbm")
autoconf.env.Append(CPPFLAGS = [ '-DHAVE_GDBM_H', '-DHAVE_GDBM' ], LIBGDBM = 'gdbm')
if env['with_geoip']:
if not autoconf.CheckLibWithHeader('GeoIP', 'GeoIP.h', 'C', autoadd = 0):
if not autoconf.CheckLibWithHeader('GeoIP', 'GeoIP.h', 'C'):
fail("Couldn't find geoip")
autoconf.env.Append(CPPFLAGS = [ '-DHAVE_GEOIP' ], LIBGEOIP = 'GeoIP')
if env['with_krb5']:
if not autoconf.CheckLibWithHeader('krb5', 'krb5.h', 'C', autoadd = 0):
if not autoconf.CheckLibWithHeader('krb5', 'krb5.h', 'C'):
fail("Couldn't find krb5")
if not autoconf.CheckLibWithHeader('gssapi_krb5', 'gssapi/gssapi_krb5.h', 'C', autoadd = 0):
if not autoconf.CheckLibWithHeader('gssapi_krb5', 'gssapi/gssapi_krb5.h', 'C'):
fail("Couldn't find gssapi_krb5")
autoconf.env.Append(CPPFLAGS = [ '-DHAVE_KRB5' ], LIBKRB5 = 'krb5')
autoconf.env.Append(LIBGSSAPI_KRB5 = 'gssapi_krb5')
if env['with_ldap']:
if not autoconf.CheckLibWithHeader('ldap', 'ldap.h', 'C', autoadd = 0):
if not autoconf.CheckLibWithHeader('ldap', 'ldap.h', 'C'):
fail("Couldn't find ldap")
if not autoconf.CheckLibWithHeader('lber', 'lber.h', 'C', autoadd = 0):
if not autoconf.CheckLibWithHeader('lber', 'lber.h', 'C'):
fail("Couldn't find lber")
autoconf.env.Append(CPPFLAGS = [ '-DLDAP_DEPRECATED=1' ])
autoconf.env.Append(CPPFLAGS = [ '-DHAVE_LDAP_H', '-DHAVE_LIBLDAP' ], LIBLDAP = 'ldap')
autoconf.env.Append(CPPFLAGS = [ '-DHAVE_LBER_H', '-DHAVE_LIBLBER' ], LIBLBER = 'lber')
if env['with_lua']:
def TryLua(env, name):
result = False
oldlibs = copy(env['LIBS'])
try:
print("Searching for lua: " + name + " >= 5.0")
env.ParseConfig("pkg-config '" + name + " >= 5.0' --cflags --libs")
env.Append(LIBLUA = env['LIBS'][len(oldlibs):])
env.Append(CPPFLAGS = [ '-DHAVE_LUA_H' ])
result = True
except:
pass
env['LIBS'] = oldlibs
return result
def TryLua(autoconf, name):
with autoconf.restoreEnvLibs():
autoconf.env['LIBS'] = []
try:
print("Searching for lua: " + name + " >= 5.0")
autoconf.env.ParseConfig("pkg-config '" + name + " >= 5.0' --cflags --libs")
except Exception as e:
print("Failed: ", e, file = sys.stderr)
return False
autoconf.env.Append(LIBLUA = autoconf.env['LIBS'])
autoconf.env.Append(CPPFLAGS = [ '-DHAVE_LUA_H' ])
return True
found_lua = False
for lua_name in ['lua5.3', 'lua-5.3', 'lua5.2', 'lua-5.2', 'lua5.1', 'lua-5.1', 'lua']:
if TryLua(env, lua_name):
if TryLua(autoconf, lua_name):
found_lua = True
break
if not found_lua:
fail("Couldn't find any lua implementation")
if env['with_memcached']:
if not autoconf.CheckLibWithHeader('memcached', 'libmemcached/memcached.h', 'C', autoadd = 0):
if not autoconf.CheckLibWithHeader('memcached', 'libmemcached/memcached.h', 'C'):
fail("Couldn't find memcached")
autoconf.env.Append(CPPFLAGS = [ '-DUSE_MEMCACHED' ], LIBMEMCACHED = 'memcached')
if env['with_mysql']:
mysql_config = checkProgram(env, 'mysql', 'mysql_config')
oldlib = env['LIBS']
env['LIBS'] = []
env.ParseConfig(mysql_config + ' --cflags --libs')
env.Append(CPPFLAGS = [ '-DHAVE_MYSQL_H', '-DHAVE_LIBMYSQL' ], LIBMYSQL = 'mysqlclient')
env['LIBS'] = oldlib
mysql_config = autoconf.checkProgram('mysql', 'mysql_config')
with autoconf.restoreEnvLibs():
autoconf.env['LIBS'] = []
autoconf.env.ParseConfig(mysql_config + ' --cflags --libs')
autoconf.env.Append(CPPFLAGS = [ '-DHAVE_MYSQL_H', '-DHAVE_LIBMYSQL' ], LIBMYSQL = 'mysqlclient')
if env['with_openssl']:
if not autoconf.CheckLibWithHeader('ssl', 'openssl/ssl.h', 'C', autoadd = 0):
if not autoconf.CheckLibWithHeader('ssl', 'openssl/ssl.h', 'C'):
fail("Couldn't find openssl")
autoconf.env.Append(CPPFLAGS = [ '-DHAVE_OPENSSL_SSL_H', '-DHAVE_LIBSSL'] , LIBSSL = 'ssl', LIBCRYPTO = 'crypto')
if env['with_pcre']:
pcre_config = checkProgram(env, 'pcre', 'pcre-config')
oldlib = env['LIBS']
env['LIBS'] = []
env.ParseConfig(pcre_config + ' --cflags --libs')
env.Append(CPPFLAGS = [ '-DHAVE_PCRE_H', '-DHAVE_LIBPCRE' ], LIBPCRE = env['LIBS'])
env['LIBS'] = oldlib
pcre_config = autoconf.checkProgram('pcre', 'pcre-config')
with autoconf.restoreEnvLibs():
autoconf.env['LIBS'] = []
autoconf.env.ParseConfig(pcre_config + ' --cflags --libs')
autoconf.env.Append(CPPFLAGS = [ '-DHAVE_PCRE_H', '-DHAVE_LIBPCRE' ], LIBPCRE = autoconf.env['LIBS'])
if env['with_pgsql']:
oldlib = env['LIBS']
env['LIBS'] = []
env.ParseConfig('pkg-config libpq --cflags --libs')
env.Append(CPPFLAGS = [ '-DHAVE_PGSQL_H', '-DHAVE_LIBPGSQL' ], LIBPGSQL = 'pq')
env['LIBS'] = oldlib
with autoconf.restoreEnvLibs():
autoconf.env['LIBS'] = []
autoconf.env.ParseConfig('pkg-config libpq --cflags --libs')
autoconf.env.Append(CPPFLAGS = [ '-DHAVE_PGSQL_H', '-DHAVE_LIBPGSQL' ], LIBPGSQL = 'pq')
if env['with_sqlite3']:
if not autoconf.CheckLibWithHeader('sqlite3', 'sqlite3.h', 'C', autoadd = 0):
if not autoconf.CheckLibWithHeader('sqlite3', 'sqlite3.h', 'C'):
fail("Couldn't find sqlite3")
autoconf.env.Append(CPPFLAGS = [ '-DHAVE_SQLITE3_H', '-DHAVE_LIBSQLITE3' ], LIBSQLITE3 = 'sqlite3')
if env['with_uuid']:
if not autoconf.CheckLibWithHeader('uuid', 'uuid/uuid.h', 'C', autoadd = 0):
if not autoconf.CheckLibWithHeader('uuid', 'uuid/uuid.h', 'C'):
fail("Couldn't find uuid")
autoconf.env.Append(CPPFLAGS = [ '-DHAVE_UUID_UUID_H', '-DHAVE_LIBUUID' ], LIBUUID = 'uuid')
if env['with_xml']:
xml2_config = checkProgram(env, 'xml', 'xml2-config')
oldlib = env['LIBS']
env['LIBS'] = []
env.ParseConfig(xml2_config + ' --cflags --libs')
env.Append(CPPFLAGS = [ '-DHAVE_LIBXML_H', '-DHAVE_LIBXML2' ], LIBXML2 = env['LIBS'])
env['LIBS'] = oldlib
xml2_config = autoconf.checkProgram('xml', 'xml2-config')
with autoconf.restoreEnvLibs():
autoconf.env['LIBS'] = []
autoconf.env.ParseConfig(xml2_config + ' --cflags --libs')
autoconf.env.Append(CPPFLAGS = [ '-DHAVE_LIBXML_H', '-DHAVE_LIBXML2' ], LIBXML2 = autoconf.env['LIBS'])
if env['with_zlib']:
if not autoconf.CheckLibWithHeader('z', 'zlib.h', 'C', autoadd = 0):
if not autoconf.CheckLibWithHeader('z', 'zlib.h', 'C'):
fail("Couldn't find zlib")
autoconf.env.Append(CPPFLAGS = [ '-DHAVE_ZLIB_H', '-DHAVE_LIBZ' ], LIBZ = 'z')

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