298 lines
10 KiB
Python
298 lines
10 KiB
Python
# Copyright (c) 2018 Open Source Foundries Limited.
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#
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# SPDX-License-Identifier: Apache-2.0
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'''Common definitions for building Zephyr applications with CMake.
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This provides some default settings and convenience wrappers for
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building Zephyr applications needed by multiple commands.
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See build.py for the build command itself.
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'''
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from collections import OrderedDict
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import os.path
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import re
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import subprocess
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import shutil
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import sys
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import packaging.version
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from west import log
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from west.util import quote_sh_list
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DEFAULT_CACHE = 'CMakeCache.txt'
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DEFAULT_CMAKE_GENERATOR = 'Ninja'
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'''Name of the default CMake generator.'''
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def run_cmake(args, cwd=None, capture_output=False, dry_run=False):
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'''Run cmake to (re)generate a build system, a script, etc.
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:param args: arguments to pass to CMake
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:param cwd: directory to run CMake in, cwd is default
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:param capture_output: if True, the output is returned instead of being
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displayed (None is returned by default, or if
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dry_run is also True)
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:param dry_run: don't actually execute the command, just print what
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would have been run
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If capture_output is set to True, returns the output of the command instead
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of displaying it on stdout/stderr..'''
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cmake = shutil.which('cmake')
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if cmake is None and not dry_run:
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log.die('CMake is not installed or cannot be found; cannot build.')
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_ensure_min_version(cmake, dry_run)
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cmd = [cmake] + args
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kwargs = dict()
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if capture_output:
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kwargs['stdout'] = subprocess.PIPE
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# CMake sends the output of message() to stderr unless it's STATUS
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kwargs['stderr'] = subprocess.STDOUT
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if cwd:
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kwargs['cwd'] = cwd
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if dry_run:
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in_cwd = ' (in {})'.format(cwd) if cwd else ''
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log.inf('Dry run{}:'.format(in_cwd), quote_sh_list(cmd))
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return None
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log.dbg('Running CMake:', quote_sh_list(cmd), level=log.VERBOSE_NORMAL)
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p = subprocess.Popen(cmd, **kwargs)
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out, _ = p.communicate()
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if p.returncode == 0:
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if out:
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return out.decode(sys.getdefaultencoding()).splitlines()
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else:
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return None
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else:
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# A real error occurred, raise an exception
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raise subprocess.CalledProcessError(p.returncode, p.args)
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def run_build(build_directory, **kwargs):
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'''Run cmake in build tool mode.
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:param build_directory: runs "cmake --build build_directory"
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:param extra_args: optional kwarg. List of additional CMake arguments;
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these come after "--build <build_directory>"
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on the command line.
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Any additional keyword arguments are passed as-is to run_cmake().
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'''
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extra_args = kwargs.pop('extra_args', [])
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return run_cmake(['--build', build_directory] + extra_args, **kwargs)
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def make_c_identifier(string):
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'''Make a C identifier from a string in the same way CMake does.
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'''
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# The behavior of CMake's string(MAKE_C_IDENTIFIER ...) is not
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# precisely documented. This behavior matches the test case
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# that introduced the function:
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#
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# https://gitlab.kitware.com/cmake/cmake/commit/0ab50aea4c4d7099b339fb38b4459d0debbdbd85
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ret = []
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alpha_under = re.compile('[A-Za-z_]')
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alpha_num_under = re.compile('[A-Za-z0-9_]')
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if not alpha_under.match(string):
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ret.append('_')
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for c in string:
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if alpha_num_under.match(c):
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ret.append(c)
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else:
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ret.append('_')
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return ''.join(ret)
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class CMakeCacheEntry:
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'''Represents a CMake cache entry.
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This class understands the type system in a CMakeCache.txt, and
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converts the following cache types to Python types:
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Cache Type Python type
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---------- -------------------------------------------
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FILEPATH str
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PATH str
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STRING str OR list of str (if ';' is in the value)
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BOOL bool
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INTERNAL str OR list of str (if ';' is in the value)
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STATIC str OR list of str (if ';' is in the value)
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---------- -------------------------------------------
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'''
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# Regular expression for a cache entry.
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#
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# CMake variable names can include escape characters, allowing a
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# wider set of names than is easy to match with a regular
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# expression. To be permissive here, use a non-greedy match up to
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# the first colon (':'). This breaks if the variable name has a
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# colon inside, but it's good enough.
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CACHE_ENTRY = re.compile(
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r'''(?P<name>.*?) # name
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:(?P<type>FILEPATH|PATH|STRING|BOOL|INTERNAL|STATIC) # type
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=(?P<value>.*) # value
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''', re.X)
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@classmethod
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def _to_bool(cls, val):
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# Convert a CMake BOOL string into a Python bool.
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#
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# "True if the constant is 1, ON, YES, TRUE, Y, or a
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# non-zero number. False if the constant is 0, OFF, NO,
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# FALSE, N, IGNORE, NOTFOUND, the empty string, or ends in
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# the suffix -NOTFOUND. Named boolean constants are
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# case-insensitive. If the argument is not one of these
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# constants, it is treated as a variable."
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#
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# https://cmake.org/cmake/help/v3.0/command/if.html
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val = val.upper()
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if val in ('ON', 'YES', 'TRUE', 'Y'):
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return True
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elif val in ('OFF', 'NO', 'FALSE', 'N', 'IGNORE', 'NOTFOUND', ''):
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return False
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elif val.endswith('-NOTFOUND'):
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return False
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else:
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try:
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v = int(val)
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return v != 0
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except ValueError as exc:
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raise ValueError('invalid bool {}'.format(val)) from exc
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@classmethod
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def from_line(cls, line, line_no):
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# Comments can only occur at the beginning of a line.
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# (The value of an entry could contain a comment character).
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if line.startswith('//') or line.startswith('#'):
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return None
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# Whitespace-only lines do not contain cache entries.
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if not line.strip():
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return None
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m = cls.CACHE_ENTRY.match(line)
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if not m:
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return None
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name, type_, value = (m.group(g) for g in ('name', 'type', 'value'))
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if type_ == 'BOOL':
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try:
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value = cls._to_bool(value)
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except ValueError as exc:
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args = exc.args + ('on line {}: {}'.format(line_no, line),)
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raise ValueError(args) from exc
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elif type_ in {'STRING', 'INTERNAL', 'STATIC'}:
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# If the value is a CMake list (i.e. is a string which
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# contains a ';'), convert to a Python list.
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if ';' in value:
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value = value.split(';')
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return CMakeCacheEntry(name, value)
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def __init__(self, name, value):
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self.name = name
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self.value = value
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def __str__(self):
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fmt = 'CMakeCacheEntry(name={}, value={})'
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return fmt.format(self.name, self.value)
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class CMakeCache:
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'''Parses and represents a CMake cache file.'''
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@staticmethod
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def from_build_dir(build_dir):
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return CMakeCache(os.path.join(build_dir, DEFAULT_CACHE))
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def __init__(self, cache_file):
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self.cache_file = cache_file
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self.load(cache_file)
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def load(self, cache_file):
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entries = []
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with open(cache_file, 'r', encoding="utf-8") as cache:
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for line_no, line in enumerate(cache):
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entry = CMakeCacheEntry.from_line(line, line_no)
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if entry:
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entries.append(entry)
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self._entries = OrderedDict((e.name, e) for e in entries)
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def get(self, name, default=None):
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entry = self._entries.get(name)
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if entry is not None:
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return entry.value
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else:
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return default
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def get_list(self, name, default=None):
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if default is None:
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default = []
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entry = self._entries.get(name)
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if entry is not None:
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value = entry.value
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if isinstance(value, list):
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return value
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elif isinstance(value, str):
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return [value] if value else []
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else:
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msg = 'invalid value {} type {}'
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raise RuntimeError(msg.format(value, type(value)))
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else:
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return default
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def __contains__(self, name):
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return name in self._entries
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def __getitem__(self, name):
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return self._entries[name].value
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def __setitem__(self, name, entry):
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if not isinstance(entry, CMakeCacheEntry):
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msg = 'improper type {} for value {}, expecting CMakeCacheEntry'
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raise TypeError(msg.format(type(entry), entry))
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self._entries[name] = entry
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def __delitem__(self, name):
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del self._entries[name]
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def __iter__(self):
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return iter(self._entries.values())
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def _ensure_min_version(cmake, dry_run):
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cmd = [cmake, '--version']
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if dry_run:
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log.inf('Dry run:', quote_sh_list(cmd))
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return
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try:
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version_out = subprocess.check_output(cmd, stderr=subprocess.DEVNULL)
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except subprocess.CalledProcessError as cpe:
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log.die('cannot get cmake version:', str(cpe))
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decoded = version_out.decode('utf-8')
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lines = decoded.splitlines()
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if not lines:
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log.die('can\'t get cmake version: ' +
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'unexpected "cmake --version" output:\n{}\n'.
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format(decoded) +
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'Please install CMake ' + _MIN_CMAKE_VERSION_STR +
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' or higher (https://cmake.org/download/).')
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version = lines[0].split()[2]
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if packaging.version.parse(version) < _MIN_CMAKE_VERSION:
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log.die('cmake version', version,
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'is less than minimum version {};'.
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format(_MIN_CMAKE_VERSION_STR),
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'please update your CMake (https://cmake.org/download/).')
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else:
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log.dbg('cmake version', version, 'is OK; minimum version is',
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_MIN_CMAKE_VERSION_STR)
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_MIN_CMAKE_VERSION_STR = '3.13.1'
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_MIN_CMAKE_VERSION = packaging.version.parse(_MIN_CMAKE_VERSION_STR)
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