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emxccompiler.py
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"""distutils.emxccompiler
Provides the EMXCCompiler class, a subclass of UnixCCompiler that
handles the EMX port of the GNU C compiler to OS/2.
"""
# issues:
#
# * OS/2 insists that DLLs can have names no longer than 8 characters
# We put export_symbols in a def-file, as though the DLL can have
# an arbitrary length name, but truncate the output filename.
#
# * only use OMF objects and use LINK386 as the linker (-Zomf)
#
# * always build for multithreading (-Zmt) as the accompanying OS/2 port
# of Python is only distributed with threads enabled.
#
# tested configurations:
#
# * EMX gcc 2.81/EMX 0.9d fix03
__revision__ = "$Id$"
import os,sys,copy
from distutils.ccompiler import gen_preprocess_options, gen_lib_options
from distutils.unixccompiler import UnixCCompiler
from distutils.file_util import write_file
from distutils.errors import DistutilsExecError, CompileError, UnknownFileError
from distutils import log
class EMXCCompiler (UnixCCompiler):
compiler_type = 'emx'
obj_extension = ".obj"
static_lib_extension = ".lib"
shared_lib_extension = ".dll"
static_lib_format = "%s%s"
shared_lib_format = "%s%s"
res_extension = ".res" # compiled resource file
exe_extension = ".exe"
def __init__ (self,
verbose=0,
dry_run=0,
force=0):
UnixCCompiler.__init__ (self, verbose, dry_run, force)
(status, details) = check_config_h()
self.debug_print("Python's GCC status: %s (details: %s)" %
(status, details))
if status is not CONFIG_H_OK:
self.warn(
"Python's pyconfig.h doesn't seem to support your compiler. " +
("Reason: %s." % details) +
"Compiling may fail because of undefined preprocessor macros.")
(self.gcc_version, self.ld_version) = \
get_versions()
self.debug_print(self.compiler_type + ": gcc %s, ld %s\n" %
(self.gcc_version,
self.ld_version) )
# Hard-code GCC because that's what this is all about.
# XXX optimization, warnings etc. should be customizable.
self.set_executables(compiler='gcc -Zomf -Zmt -O3 -fomit-frame-pointer -mprobe -Wall',
compiler_so='gcc -Zomf -Zmt -O3 -fomit-frame-pointer -mprobe -Wall',
linker_exe='gcc -Zomf -Zmt -Zcrtdll',
linker_so='gcc -Zomf -Zmt -Zcrtdll -Zdll')
# want the gcc library statically linked (so that we don't have
# to distribute a version dependent on the compiler we have)
self.dll_libraries=["gcc"]
# __init__ ()
def _compile(self, obj, src, ext, cc_args, extra_postargs, pp_opts):
if ext == '.rc':
# gcc requires '.rc' compiled to binary ('.res') files !!!
try:
self.spawn(["rc", "-r", src])
except DistutilsExecError, msg:
raise CompileError, msg
else: # for other files use the C-compiler
try:
self.spawn(self.compiler_so + cc_args + [src, '-o', obj] +
extra_postargs)
except DistutilsExecError, msg:
raise CompileError, msg
def link (self,
target_desc,
objects,
output_filename,
output_dir=None,
libraries=None,
library_dirs=None,
runtime_library_dirs=None,
export_symbols=None,
debug=0,
extra_preargs=None,
extra_postargs=None,
build_temp=None,
target_lang=None):
# use separate copies, so we can modify the lists
extra_preargs = copy.copy(extra_preargs or [])
libraries = copy.copy(libraries or [])
objects = copy.copy(objects or [])
# Additional libraries
libraries.extend(self.dll_libraries)
# handle export symbols by creating a def-file
# with executables this only works with gcc/ld as linker
if ((export_symbols is not None) and
(target_desc != self.EXECUTABLE)):
# (The linker doesn't do anything if output is up-to-date.
# So it would probably better to check if we really need this,
# but for this we had to insert some unchanged parts of
# UnixCCompiler, and this is not what we want.)
# we want to put some files in the same directory as the
# object files are, build_temp doesn't help much
# where are the object files
temp_dir = os.path.dirname(objects[0])
# name of dll to give the helper files the same base name
(dll_name, dll_extension) = os.path.splitext(
os.path.basename(output_filename))
# generate the filenames for these files
def_file = os.path.join(temp_dir, dll_name + ".def")
# Generate .def file
contents = [
"LIBRARY %s INITINSTANCE TERMINSTANCE" % \
os.path.splitext(os.path.basename(output_filename))[0],
"DATA MULTIPLE NONSHARED",
"EXPORTS"]
for sym in export_symbols:
contents.append(' "%s"' % sym)
self.execute(write_file, (def_file, contents),
"writing %s" % def_file)
# next add options for def-file and to creating import libraries
# for gcc/ld the def-file is specified as any other object files
objects.append(def_file)
#end: if ((export_symbols is not None) and
# (target_desc != self.EXECUTABLE or self.linker_dll == "gcc")):
# who wants symbols and a many times larger output file
# should explicitly switch the debug mode on
# otherwise we let dllwrap/ld strip the output file
# (On my machine: 10KB < stripped_file < ??100KB
# unstripped_file = stripped_file + XXX KB
# ( XXX=254 for a typical python extension))
if not debug:
extra_preargs.append("-s")
UnixCCompiler.link(self,
target_desc,
objects,
output_filename,
output_dir,
libraries,
library_dirs,
runtime_library_dirs,
None, # export_symbols, we do this in our def-file
debug,
extra_preargs,
extra_postargs,
build_temp,
target_lang)
# link ()
# -- Miscellaneous methods -----------------------------------------
# override the object_filenames method from CCompiler to
# support rc and res-files
def object_filenames (self,
source_filenames,
strip_dir=0,
output_dir=''):
if output_dir is None: output_dir = ''
obj_names = []
for src_name in source_filenames:
# use normcase to make sure '.rc' is really '.rc' and not '.RC'
(base, ext) = os.path.splitext (os.path.normcase(src_name))
if ext not in (self.src_extensions + ['.rc']):
raise UnknownFileError, \
"unknown file type '%s' (from '%s')" % \
(ext, src_name)
if strip_dir:
base = os.path.basename (base)
if ext == '.rc':
# these need to be compiled to object files
obj_names.append (os.path.join (output_dir,
base + self.res_extension))
else:
obj_names.append (os.path.join (output_dir,
base + self.obj_extension))
return obj_names
# object_filenames ()
# override the find_library_file method from UnixCCompiler
# to deal with file naming/searching differences
def find_library_file(self, dirs, lib, debug=0):
shortlib = '%s.lib' % lib
longlib = 'lib%s.lib' % lib # this form very rare
# get EMX's default library directory search path
try:
emx_dirs = os.environ['LIBRARY_PATH'].split(';')
except KeyError:
emx_dirs = []
for dir in dirs + emx_dirs:
shortlibp = os.path.join(dir, shortlib)
longlibp = os.path.join(dir, longlib)
if os.path.exists(shortlibp):
return shortlibp
elif os.path.exists(longlibp):
return longlibp
# Oops, didn't find it in *any* of 'dirs'
return None
# class EMXCCompiler
# Because these compilers aren't configured in Python's pyconfig.h file by
# default, we should at least warn the user if he is using a unmodified
# version.
CONFIG_H_OK = "ok"
CONFIG_H_NOTOK = "not ok"
CONFIG_H_UNCERTAIN = "uncertain"
def check_config_h():
"""Check if the current Python installation (specifically, pyconfig.h)
appears amenable to building extensions with GCC. Returns a tuple
(status, details), where 'status' is one of the following constants:
CONFIG_H_OK
all is well, go ahead and compile
CONFIG_H_NOTOK
doesn't look good
CONFIG_H_UNCERTAIN
not sure -- unable to read pyconfig.h
'details' is a human-readable string explaining the situation.
Note there are two ways to conclude "OK": either 'sys.version' contains
the string "GCC" (implying that this Python was built with GCC), or the
installed "pyconfig.h" contains the string "__GNUC__".
"""
# XXX since this function also checks sys.version, it's not strictly a
# "pyconfig.h" check -- should probably be renamed...
from distutils import sysconfig
import string
# if sys.version contains GCC then python was compiled with
# GCC, and the pyconfig.h file should be OK
if string.find(sys.version,"GCC") >= 0:
return (CONFIG_H_OK, "sys.version mentions 'GCC'")
fn = sysconfig.get_config_h_filename()
try:
# It would probably better to read single lines to search.
# But we do this only once, and it is fast enough
f = open(fn)
s = f.read()
f.close()
except IOError, exc:
# if we can't read this file, we cannot say it is wrong
# the compiler will complain later about this file as missing
return (CONFIG_H_UNCERTAIN,
"couldn't read '%s': %s" % (fn, exc.strerror))
else:
# "pyconfig.h" contains an "#ifdef __GNUC__" or something similar
if string.find(s,"__GNUC__") >= 0:
return (CONFIG_H_OK, "'%s' mentions '__GNUC__'" % fn)
else:
return (CONFIG_H_NOTOK, "'%s' does not mention '__GNUC__'" % fn)
def get_versions():
""" Try to find out the versions of gcc and ld.
If not possible it returns None for it.
"""
from distutils.version import StrictVersion
from distutils.spawn import find_executable
import re
gcc_exe = find_executable('gcc')
if gcc_exe:
out = os.popen(gcc_exe + ' -dumpversion','r')
out_string = out.read()
out.close()
result = re.search('(\d+\.\d+\.\d+)',out_string)
if result:
gcc_version = StrictVersion(result.group(1))
else:
gcc_version = None
else:
gcc_version = None
# EMX ld has no way of reporting version number, and we use GCC
# anyway - so we can link OMF DLLs
ld_version = None
return (gcc_version, ld_version)