122 lines
4.3 KiB
Python
122 lines
4.3 KiB
Python
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# pkg-config, https://www.freedesktop.org/wiki/Software/pkg-config/ integration for cffi
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import sys, os, subprocess
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from .error import PkgConfigError
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def merge_flags(cfg1, cfg2):
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"""Merge values from cffi config flags cfg2 to cf1
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Example:
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merge_flags({"libraries": ["one"]}, {"libraries": ["two"]})
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{"libraries": ["one", "two"]}
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"""
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for key, value in cfg2.items():
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if key not in cfg1:
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cfg1[key] = value
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else:
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if not isinstance(cfg1[key], list):
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raise TypeError("cfg1[%r] should be a list of strings" % (key,))
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if not isinstance(value, list):
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raise TypeError("cfg2[%r] should be a list of strings" % (key,))
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cfg1[key].extend(value)
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return cfg1
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def call(libname, flag, encoding=sys.getfilesystemencoding()):
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"""Calls pkg-config and returns the output if found
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"""
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a = ["pkg-config", "--print-errors"]
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a.append(flag)
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a.append(libname)
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try:
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pc = subprocess.Popen(a, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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except EnvironmentError as e:
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raise PkgConfigError("cannot run pkg-config: %s" % (str(e).strip(),))
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bout, berr = pc.communicate()
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if pc.returncode != 0:
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try:
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berr = berr.decode(encoding)
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except Exception:
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pass
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raise PkgConfigError(berr.strip())
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if sys.version_info >= (3,) and not isinstance(bout, str): # Python 3.x
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try:
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bout = bout.decode(encoding)
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except UnicodeDecodeError:
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raise PkgConfigError("pkg-config %s %s returned bytes that cannot "
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"be decoded with encoding %r:\n%r" %
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(flag, libname, encoding, bout))
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if os.altsep != '\\' and '\\' in bout:
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raise PkgConfigError("pkg-config %s %s returned an unsupported "
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"backslash-escaped output:\n%r" %
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(flag, libname, bout))
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return bout
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def flags_from_pkgconfig(libs):
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r"""Return compiler line flags for FFI.set_source based on pkg-config output
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Usage
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...
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ffibuilder.set_source("_foo", pkgconfig = ["libfoo", "libbar >= 1.8.3"])
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If pkg-config is installed on build machine, then arguments include_dirs,
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library_dirs, libraries, define_macros, extra_compile_args and
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extra_link_args are extended with an output of pkg-config for libfoo and
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libbar.
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Raises PkgConfigError in case the pkg-config call fails.
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"""
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def get_include_dirs(string):
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return [x[2:] for x in string.split() if x.startswith("-I")]
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def get_library_dirs(string):
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return [x[2:] for x in string.split() if x.startswith("-L")]
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def get_libraries(string):
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return [x[2:] for x in string.split() if x.startswith("-l")]
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# convert -Dfoo=bar to list of tuples [("foo", "bar")] expected by distutils
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def get_macros(string):
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def _macro(x):
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x = x[2:] # drop "-D"
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if '=' in x:
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return tuple(x.split("=", 1)) # "-Dfoo=bar" => ("foo", "bar")
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else:
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return (x, None) # "-Dfoo" => ("foo", None)
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return [_macro(x) for x in string.split() if x.startswith("-D")]
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def get_other_cflags(string):
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return [x for x in string.split() if not x.startswith("-I") and
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not x.startswith("-D")]
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def get_other_libs(string):
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return [x for x in string.split() if not x.startswith("-L") and
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not x.startswith("-l")]
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# return kwargs for given libname
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def kwargs(libname):
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fse = sys.getfilesystemencoding()
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all_cflags = call(libname, "--cflags")
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all_libs = call(libname, "--libs")
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return {
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"include_dirs": get_include_dirs(all_cflags),
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"library_dirs": get_library_dirs(all_libs),
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"libraries": get_libraries(all_libs),
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"define_macros": get_macros(all_cflags),
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"extra_compile_args": get_other_cflags(all_cflags),
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"extra_link_args": get_other_libs(all_libs),
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}
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# merge all arguments together
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ret = {}
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for libname in libs:
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lib_flags = kwargs(libname)
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merge_flags(ret, lib_flags)
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return ret
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