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Diffstat (limited to 'build/moz.configure/compile-checks.configure')
| -rw-r--r-- | build/moz.configure/compile-checks.configure | 309 |
1 files changed, 309 insertions, 0 deletions
diff --git a/build/moz.configure/compile-checks.configure b/build/moz.configure/compile-checks.configure new file mode 100644 index 0000000000..d40a6b40af --- /dev/null +++ b/build/moz.configure/compile-checks.configure @@ -0,0 +1,309 @@ +# -*- Mode: python; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40 -*- +# vim: set filetype=python: +# This Source Code Form is subject to the terms of the Mozilla Public +# License, v. 2.0. If a copy of the MPL was not distributed with this +# file, You can obtain one at http://mozilla.org/MPL/2.0/. + + +# Generates a test program and attempts to compile it. In case of failure, the +# resulting check will return None. If the test program succeeds, it will return +# the output of the test program. +# - `includes` are the includes (as file names) that will appear at the top of +# the generated test program. +# - `body` is the code that will appear in the main function of the generated +# test program. `return 0;` is appended to the function body automatically. +# - `language` is the language selection, so that the appropriate compiler is +# used. +# - `flags` are the flags to be passed to the compiler, in addition to `-c`. +# - `check_msg` is the message to be printed to accompany compiling the test +# program. +@template +def try_compile( + includes=None, + body="", + language="C++", + flags=None, + check_msg=None, + when=None, + onerror=lambda: None, +): + compiler = { + "C": c_compiler, + "C++": cxx_compiler, + }[language] + + return compiler.try_compile( + includes, body, flags, check_msg, when=when, onerror=onerror + ) + + +# Checks for the presence of the given header on the target system by compiling +# a test program including that header. The return value of the template is a +# check function returning True if the header is present, and None if it is not. +# The value of this check function is also used to set a variable (with set_define) +# corresponding to the checked header. For instance, HAVE_MALLOC_H will be set in +# defines if check_header if called with 'malloc.h' as input and malloc.h is +# present on the target. +# - `header` is the header, as a file name, to check for. +# - `language` is the language selection, so that the appropriate compiler is +# used. +# - `flags` are the flags to be passed to the compiler, in addition to `-c`. +# - `includes` are additional includes, as file names, to appear before the +# header checked for. +# - `when` is a depends function that if present will make performing the check +# conditional on the value of that function. +@template +def check_header( + header, language="C++", flags=None, includes=None, when=None, onerror=lambda: None +): + if when is None: + when = always + + if includes: + includes = includes[:] + else: + includes = [] + includes.append(header) + + have_header = try_compile( + includes=includes, + language=language, + flags=flags, + check_msg="for %s" % header, + when=when, + onerror=onerror, + ) + header_var = "HAVE_%s" % ( + header.upper().replace("-", "_").replace("/", "_").replace(".", "_") + ) + set_define(header_var, have_header) + return have_header + + +# A convenience wrapper for check_header for checking multiple headers. +# returns an array of the resulting checks in order corresponding to the +# provided headers. +# - `headers` are the headers to be checked. +# - `kwargs` are keyword arguments passed verbatim to check_header. + + +@template +def check_headers(*headers, **kwargs): + checks = [] + for header in headers: + checks.append(check_header(header, **kwargs)) + return checks + + +@depends(linker_ldflags, target.kernel) +def check_symbol_flags(linker_ldflags, kernel): + if kernel == "WINNT": + # The build doesn't use the compiler to link things as of writing, + # but some compilation checks do. When using clang-cl, the only + # linker we really support is lld.link, but clang-cl defaults to + # link.exe (even when cross-compiling). So we force the use of + # lld.link for the linkage checks. + return ["-fuse-ld=lld"] + return linker_ldflags + + +# Checks for the presence of the given symbol on the target system by compiling +# a test program. The return value of the template is a check function +# returning True if the symbol can be found, and None if it is not. +@template +def check_symbol(symbol, language="C", flags=None, when=None, onerror=lambda: None): + if when is None: + when = always + + compiler, extern_c = { + "C": (c_compiler, ""), + "C++": (cxx_compiler, 'extern "C" '), + }[language] + + # Stolen from autoconf 2.13 ; might be irrelevant now, but it doesn't hurt to + # keep using a char return type. + comment = [ + "/* Override any gcc2 internal prototype to avoid an error. */", + "/* We use char because int might match the return type of a gcc2", + " builtin and then its argument prototype would still apply. */", + ] + + if flags: + + @depends(check_symbol_flags, dependable(flags)) + def flags(base_flags, extra_flags): + if base_flags and extra_flags: + return base_flags + list(extra_flags) + if extra_flags: + return extra_flags + return base_flags + + else: + flags = check_symbol_flags + + return compiler.try_run( + header=comment + ["%schar %s();" % (extern_c, symbol)], + body="%s();" % symbol, + flags=flags, + check_msg="for %s" % symbol, + when=when, + onerror=onerror, + ) + + +# Determine whether to add a given flag to the given lists of flags for C or +# C++ compilation. +# - `flag` is the flag to test +# - `flags_collection` is a @depends function for a namespace of lists of +# C/C++ compiler flags to add to. +# - `test_flags` is a list of flags to pass to the compiler instead of merely +# passing `flag`. This is especially useful for checking warning flags. If +# this list is empty, `flag` will be passed on its own. +# - `compiler` (optional) is the compiler to test against (c_compiler or +# cxx_compiler, from toolchain.configure). When omitted, both compilers +# are tested; the list of flags added to is dependent on the compiler tested. +# - `when` (optional) is a @depends function or option name conditioning +# when the warning flag is wanted. +# - `check`, when not set, skips checking whether the flag is supported and +# adds it to the list of flags unconditionally. +@template +def check_and_add_flags( + flag, flags_collection, test_flags, compiler=None, when=None, check=True +): + if compiler is not None: + compilers = (compiler,) + else: + compilers = (c_compiler, cxx_compiler) + + if when is None: + when = always + + results = [] + + if test_flags: + flags = test_flags + else: + flags = [flag] + + for c in compilers: + assert c in {c_compiler, cxx_compiler, host_c_compiler, host_cxx_compiler} + lang, list_of_flags = { + c_compiler: ("C", flags_collection.cflags), + cxx_compiler: ("C++", flags_collection.cxxflags), + host_c_compiler: ("host C", flags_collection.host_cflags), + host_cxx_compiler: ("host C++", flags_collection.host_cxxflags), + }[c] + + result = when + + if check: + + @depends(c, dependable(flags)) + def flags(c, flags): + # Don't error out just because clang complains about other things. + if c.type in ("clang", "clang-cl"): + flags += ["-Wno-error=unused-command-line-argument"] + + return flags + + result = c.try_compile( + flags=flags, + when=result, + check_msg="whether the %s compiler supports %s" % (lang, flag), + ) + + @depends(result, list_of_flags) + def maybe_add_flag(result, list_of_flags): + if result: + list_of_flags.append(flag) + + results.append(result) + + return tuple(results) + + +@dependable +def warnings_flags(): + return namespace(cflags=[], cxxflags=[], host_cflags=[], host_cxxflags=[]) + + +# Tests whether GCC or clang support the given warning flag, and if it is, +# add it to the list of warning flags for the build. +# - `warning` is the warning flag (e.g. -Wfoo) +# - `compiler` (optional) is the compiler to test against (c_compiler or +# cxx_compiler, from toolchain.configure). When omitted, both compilers +# are tested. +# - `when` (optional) is a @depends function or option name conditioning +# when the warning flag is wanted. +# - `check`, when not set, skips checking whether the flag is supported and +# adds it to the list of warning flags unconditionally. This is only meant +# for add_warning(). +@template +def check_and_add_warning(warning, compiler=None, when=None, check=True): + # GCC and clang will fail if given an unknown warning option like + # -Wfoobar. But later versions won't fail if given an unknown negated + # warning option like -Wno-foobar. So when we are checking for support + # of a negated warning option, we actually test the positive form, but + # add the negated form to the flags variable. + if warning.startswith("-Wno-") and not warning.startswith("-Wno-error="): + flags = ["-Werror", "-W" + warning[5:]] + elif warning.startswith("-Werror="): + flags = [warning] + else: + flags = ["-Werror", warning] + + return check_and_add_flags( + warning, warnings_flags, flags, compiler=compiler, when=when, check=check + ) + + +# Add the given warning to the list of warning flags for the build. +# - `warning` is the warning flag (e.g. -Wfoo) +# - `compiler` (optional) is the compiler to add the flag for (c_compiler or +# cxx_compiler, from toolchain.configure). When omitted, the warning flag +# is added for both compilers. +# - `when` (optional) is a @depends function or option name conditioning +# when the warning flag is wanted. + + +@template +def add_warning(warning, compiler=None, when=None): + check_and_add_warning(warning, compiler, when, check=False) + + +# Like the warning checks above, but for general compilation flags. +@dependable +def compilation_flags(): + return namespace(cflags=[], cxxflags=[], host_cflags=[], host_cxxflags=[]) + + +# Tests whether GCC or clang support the given compilation flag; if the flag +# is supported, add it to the list of compilation flags for the build. +# - `flag` is the flag to test +# - `compiler` (optional) is the compiler to test against (c_compiler or +# cxx_compiler, from toolchain.configure). When omitted, both compilers +# are tested. +# - `when` (optional) is a @depends function or option name conditioning +# when the warning flag is wanted. +# - `check`, when not set, skips checking whether the flag is supported and +# adds it to the list of flags unconditionally. This is only meant for +# add_flag(). +@template +def check_and_add_flag(flag, compiler=None, when=None, check=True): + flags = ["-Werror", flag] + + return check_and_add_flags( + flag, compilation_flags, flags, compiler=compiler, when=when, check=check + ) + + +# Add the given flag to the list of flags for the build. +# - `flag` is the flag (e.g. -fno-sized-deallocation) +# - `compiler` (optional) is the compiler to add the flag for (c_compiler or +# cxx_compiler, from toolchain.configure). When omitted, the flag is added +# for both compilers. +# - `when` (optional) is a @depends function or option name conditioning +# when the flag is wanted. +@template +def add_flag(warning, compiler=None, when=None): + check_and_add_flag(warning, compiler, when, check=False) |