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153 lines
6.1 KiB
Python
153 lines
6.1 KiB
Python
# -*- Mode: python; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40 -*-
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# vim: set filetype=python:
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# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this
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# file, You can obtain one at http://mozilla.org/MPL/2.0/.
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# Generates a test program and attempts to compile it. In case of failure, the
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# resulting check will return None. If the test program succeeds, it will return
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# the output of the test program.
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# - `includes` are the includes (as file names) that will appear at the top of
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# the generated test program.
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# - `body` is the code that will appear in the main function of the generated
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# test program. `return 0;` is appended to the function body automatically.
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# - `language` is the language selection, so that the appropriate compiler is
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# used.
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# - `flags` are the flags to be passed to the compiler, in addition to `-c`.
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# - `check_msg` is the message to be printed to accompany compiling the test
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# program.
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@template
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def try_compile(includes=None, body='', language='C++', flags=None, check_msg=None,
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when=None):
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compiler = {
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'C': c_compiler,
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'C++': cxx_compiler,
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}[language]
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return compiler.try_compile(includes, body, flags, check_msg, when=when)
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# Checks for the presence of the given header on the target system by compiling
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# a test program including that header. The return value of the template is a
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# check function returning True if the header is present, and None if it is not.
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# The value of this check function is also used to set a variable (with set_define)
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# corresponding to the checked header. For instance, HAVE_MALLOC_H will be set in
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# defines if check_header if called with 'malloc.h' as input and malloc.h is
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# present on the target.
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# - `header` is the header, as a file name, to check for.
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# - `language` is the language selection, so that the appropriate compiler is
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# used.
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# - `flags` are the flags to be passed to the compiler, in addition to `-c`.
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# - `includes` are additional includes, as file names, to appear before the
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# header checked for.
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# - `when` is a depends function that if present will make performing the check
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# conditional on the value of that function.
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@template
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def check_header(header, language='C++', flags=None, includes=None, when=None):
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when = when or always
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if includes:
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includes = includes[:]
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else:
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includes = []
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includes.append(header)
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have_header = try_compile(includes=includes, language=language, flags=flags,
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check_msg='for %s' % header, when=when)
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header_var = 'HAVE_%s' % (header.upper()
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.replace('-', '_')
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.replace('/', '_')
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.replace('.', '_'))
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set_define(header_var, have_header)
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return have_header
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# A convenience wrapper for check_header for checking multiple headers.
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# returns an array of the resulting checks in order corresponding to the
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# provided headers.
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# - `headers` are the headers to be checked.
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# - `kwargs` are keyword arguments passed verbatim to check_header.
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@template
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def check_headers(*headers, **kwargs):
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checks = []
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for header in headers:
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checks.append(check_header(header, **kwargs))
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return checks
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@dependable
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def warnings_cflags():
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return []
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@dependable
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def warnings_cxxflags():
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return []
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# Tests whether GCC or clang support the given warning flag, and if it is,
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# add it to the list of warning flags for the build.
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# - `warning` is the warning flag (e.g. -Wfoo)
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# - `compiler` (optional) is the compiler to test against (c_compiler or
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# cxx_compiler, from toolchain.configure). When omitted, both compilers
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# are tested.
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# - `when` (optional) is a @depends function or option name conditioning
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# when the warning flag is wanted.
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# - `check`, when not set, skips checking whether the flag is supported and
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# adds it to the list of warning flags unconditionally. This is only meant
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# for add_gcc_warning().
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@template
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def check_and_add_gcc_warning(warning, compiler=None, when=None, check=True):
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if compiler:
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compilers = (compiler,)
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else:
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compilers = (c_compiler, cxx_compiler)
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when = when or always
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for c in compilers:
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assert c in (c_compiler, cxx_compiler)
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lang, warnings_flags = {
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c_compiler: ('C', warnings_cflags),
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cxx_compiler: ('C++', warnings_cxxflags),
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}[c]
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# GCC and clang will fail if given an unknown warning option like
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# -Wfoobar. But later versions won't fail if given an unknown negated
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# warning option like -Wno-foobar. So when we are checking for support
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# of a negated warning option, we actually test the positive form, but
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# add the negated form to the flags variable.
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if (warning.startswith('-Wno-') and
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not warning.startswith('-Wno-error=')):
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flags = ['-Werror', '-W' + warning[5:]]
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elif warning.startswith('-Werror='):
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flags = [warning]
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else:
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flags = ['-Werror', warning]
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@depends(c, when)
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def result(c, when):
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if when and c.type in ('clang', 'gcc'):
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return True
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if check:
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result = c.try_compile(
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flags=flags, when=result,
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check_msg='whether the %s compiler supports %s' % (lang,
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warning))
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@depends(result, warnings_flags)
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def maybe_add_flag(result, warnings_flags):
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if result:
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warnings_flags.append(warning)
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# Add the given warning to the list of warning flags for the build.
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# - `warning` is the warning flag (e.g. -Wfoo)
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# - `compiler` (optional) is the compiler to add the flag for (c_compiler or
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# cxx_compiler, from toolchain.configure). When omitted, the warning flag
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# is added for both compilers.
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# - `when` (optional) is a @depends function or option name conditioning
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# when the warning flag is wanted.
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@template
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def add_gcc_warning(warning, compiler=None, when=None):
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check_and_add_gcc_warning(warning, compiler, when, check=False)
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