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