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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): |
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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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def get_macros(string): |
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def _macro(x): |
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x = x[2:] |
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if '=' in x: |
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return tuple(x.split("=", 1)) |
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else: |
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return (x, 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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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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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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