| # Copyright 2016 The Bazel Authors. All rights reserved. |
| # |
| # Licensed under the Apache License, Version 2.0 (the "License"); |
| # you may not use this file except in compliance with the License. |
| # You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, software |
| # distributed under the License is distributed on an "AS IS" BASIS, |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| # See the License for the specific language governing permissions and |
| # limitations under the License. |
| """Rules for configuring the C++ toolchain (experimental).""" |
| |
| |
| def _get_value(it): |
| """Convert `it` in serialized protobuf format.""" |
| if type(it) == "int": |
| return str(it) |
| elif type(it) == "bool": |
| return "true" if it else "false" |
| else: |
| return "\"%s\"" % it |
| |
| |
| def _build_crosstool(d, prefix=" "): |
| """Convert `d` to a string version of a CROSSTOOL file content.""" |
| lines = [] |
| for k in d: |
| if type(d[k]) == "list": |
| for it in d[k]: |
| lines.append("%s%s: %s" % (prefix, k, _get_value(it))) |
| else: |
| lines.append("%s%s: %s" % (prefix, k, _get_value(d[k]))) |
| return "\n".join(lines) |
| |
| |
| def _build_tool_path(d): |
| """Build the list of tool_path for the CROSSTOOL file.""" |
| lines = [] |
| for k in d: |
| lines.append(" tool_path {name: \"%s\" path: \"%s\" }" % (k, d[k])) |
| return "\n".join(lines) |
| |
| def auto_configure_fail(msg): |
| """Output failure message when auto configuration fails.""" |
| red = "\033[0;31m" |
| no_color = "\033[0m" |
| fail("\n%sAuto-Configuration Error:%s %s\n" % (red, no_color, msg)) |
| |
| |
| def auto_configure_warning(msg): |
| """Output warning message during auto configuration.""" |
| yellow = "\033[1;33m" |
| no_color = "\033[0m" |
| print("\n%sAuto-Configuration Warning:%s %s\n" % (yellow, no_color, msg)) |
| |
| |
| def _get_env_var(repository_ctx, name, default = None): |
| """Find an environment variable in system path.""" |
| if name in repository_ctx.os.environ: |
| return repository_ctx.os.environ[name] |
| if default != None: |
| auto_configure_warning("'%s' environment variable is not set, using '%s' as default" % (name, default)) |
| return default |
| auto_configure_fail("'%s' environment variable is not set" % name) |
| |
| |
| def _which(repository_ctx, cmd, default): |
| """A wrapper around repository_ctx.which() to provide a fallback value.""" |
| result = repository_ctx.which(cmd) |
| return default if result == None else str(result) |
| |
| |
| def _which_cmd(repository_ctx, cmd, default = None): |
| """Find cmd in PATH using repository_ctx.which() and fail if cannot find it.""" |
| result = repository_ctx.which(cmd) |
| if result != None: |
| return str(result) |
| path = _get_env_var(repository_ctx, "PATH") |
| if default != None: |
| auto_configure_warning("Cannot find %s in PATH, using '%s' as default.\nPATH=%s" % (cmd, default, path)) |
| return default |
| auto_configure_fail("Cannot find %s in PATH, please make sure %s is installed and add its directory in PATH.\nPATH=%s" % (cmd, cmd, path)) |
| return str(result) |
| |
| def _get_tool_paths(repository_ctx, darwin, cc): |
| """Compute the path to the various tools.""" |
| return {k: _which(repository_ctx, k, "/usr/bin/" + k) |
| for k in [ |
| "ld", |
| "cpp", |
| "dwp", |
| "gcov", |
| "nm", |
| "objcopy", |
| "objdump", |
| "strip", |
| ]} + { |
| "gcc": cc, |
| "ar": "/usr/bin/libtool" |
| if darwin else _which(repository_ctx, "ar", "/usr/bin/ar") |
| } |
| |
| |
| def _ld_library_paths(repository_ctx): |
| """Use ${LD_LIBRARY_PATH} to compute the list -Wl,rpath flags.""" |
| if "LD_LIBRARY_PATH" in repository_ctx.os.environ: |
| result = [] |
| for p in repository_ctx.os.environ["LD_LIBRARY_PATH"].split(":"): |
| p = str(repository_ctx.path(p)) # Normalize the path |
| result.append("-Wl,-rpath," + p) |
| result.append("-L" + p) |
| return result |
| else: |
| return [] |
| |
| |
| def _cplus_include_paths(repository_ctx): |
| """Use ${CPLUS_INCLUDE_PATH} to compute the list of flags for cxxflag.""" |
| if "CPLUS_INCLUDE_PATH" in repository_ctx.os.environ: |
| result = [] |
| for p in repository_ctx.os.environ["CPLUS_INCLUDE_PATH"].split(":"): |
| p = str(repository_ctx.path(p)) # Normalize the path |
| result.append("-I" + p) |
| return result |
| else: |
| return [] |
| |
| |
| def _get_cpu_value(repository_ctx): |
| """Compute the cpu_value based on the OS name.""" |
| os_name = repository_ctx.os.name.lower() |
| if os_name.startswith("mac os"): |
| return "darwin" |
| if os_name.find("freebsd") != -1: |
| return "freebsd" |
| if os_name.find("windows") != -1: |
| return "x64_windows" |
| # Use uname to figure out whether we are on x86_32 or x86_64 |
| result = repository_ctx.execute(["uname", "-m"]) |
| return "k8" if result.stdout.strip() in ["amd64", "x86_64", "x64"] else "piii" |
| |
| |
| _INC_DIR_MARKER_BEGIN = "#include <...>" |
| |
| # OSX add " (framework directory)" at the end of line, strip it. |
| _OSX_FRAMEWORK_SUFFIX = " (framework directory)" |
| _OSX_FRAMEWORK_SUFFIX_LEN = len(_OSX_FRAMEWORK_SUFFIX) |
| def _cxx_inc_convert(path): |
| """Convert path returned by cc -E xc++ in a complete path.""" |
| path = path.strip() |
| if path.endswith(_OSX_FRAMEWORK_SUFFIX): |
| path = path[:-_OSX_FRAMEWORK_SUFFIX_LEN].strip() |
| return path |
| |
| def _get_cxx_inc_directories(repository_ctx, cc): |
| """Compute the list of default C++ include directories.""" |
| result = repository_ctx.execute([cc, "-E", "-xc++", "-", "-v"]) |
| index1 = result.stderr.find(_INC_DIR_MARKER_BEGIN) |
| if index1 == -1: |
| return [] |
| index1 = result.stderr.find("\n", index1) |
| if index1 == -1: |
| return [] |
| index2 = result.stderr.rfind("\n ") |
| if index2 == -1 or index2 < index1: |
| return [] |
| index2 = result.stderr.find("\n", index2 + 1) |
| if index2 == -1: |
| inc_dirs = result.stderr[index1 + 1:] |
| else: |
| inc_dirs = result.stderr[index1 + 1:index2].strip() |
| |
| return [repository_ctx.path(_cxx_inc_convert(p)) |
| for p in inc_dirs.split("\n")] |
| |
| def _add_option_if_supported(repository_ctx, cc, option): |
| """Checks that `option` is supported by the C compiler.""" |
| result = repository_ctx.execute([ |
| cc, |
| option, |
| "-o", |
| "/dev/null", |
| "-c", |
| str(repository_ctx.path("tools/cpp/empty.cc")) |
| ]) |
| return [option] if result.stderr.find(option) == -1 else [] |
| |
| |
| def _crosstool_content(repository_ctx, cc, cpu_value, darwin): |
| """Return the content for the CROSSTOOL file, in a dictionary.""" |
| return { |
| "abi_version": "local", |
| "abi_libc_version": "local", |
| "builtin_sysroot": "", |
| "compiler": "compiler", |
| "host_system_name": "local", |
| "needsPic": True, |
| "supports_gold_linker": False, |
| "supports_incremental_linker": False, |
| "supports_fission": False, |
| "supports_interface_shared_objects": False, |
| "supports_normalizing_ar": False, |
| "supports_start_end_lib": False, |
| "supports_thin_archives": False, |
| "target_libc": "macosx" if darwin else "local", |
| "target_cpu": cpu_value, |
| "target_system_name": "local", |
| "cxx_flag": [ |
| "-std=c++0x", |
| ] + _cplus_include_paths(repository_ctx), |
| "linker_flag": [ |
| "-lstdc++", |
| "-lm", # Some systems expect -lm in addition to -lstdc++ |
| # Anticipated future default. |
| ] + _add_option_if_supported(repository_ctx, cc, "-Wl,-no-as-needed") + ( |
| [ |
| "-undefined", |
| "dynamic_lookup", |
| "-headerpad_max_install_names", |
| ] if darwin else [ |
| "-B" + str(repository_ctx.path(cc).dirname), |
| # Always have -B/usr/bin, see https://github.com/bazelbuild/bazel/issues/760. |
| "-B/usr/bin", |
| # Have gcc return the exit code from ld. |
| "-pass-exit-codes", |
| # Stamp the binary with a unique identifier. |
| "-Wl,--build-id=md5", |
| "-Wl,--hash-style=gnu" |
| # Gold linker only? Can we enable this by default? |
| # "-Wl,--warn-execstack", |
| # "-Wl,--detect-odr-violations" |
| ]) + _ld_library_paths(repository_ctx), |
| "ar_flag": ["-static", "-s", "-o"] if darwin else [], |
| "cxx_builtin_include_directory": _get_cxx_inc_directories(repository_ctx, cc), |
| "objcopy_embed_flag": ["-I", "binary"], |
| "unfiltered_cxx_flag": |
| _add_option_if_supported(repository_ctx, cc, "-fno-canonical-system-headers") + [ |
| # Make C++ compilation deterministic. Use linkstamping instead of these |
| # compiler symbols. |
| "-Wno-builtin-macro-redefined", |
| "-D__DATE__=\\\"redacted\\\"", |
| "-D__TIMESTAMP__=\\\"redacted\\\"", |
| "-D__TIME__=\\\"redacted\\\"" |
| ], |
| "compiler_flag": [ |
| # Security hardening on by default. |
| # Conservative choice; -D_FORTIFY_SOURCE=2 may be unsafe in some cases. |
| # We need to undef it before redefining it as some distributions now have |
| # it enabled by default. |
| "-U_FORTIFY_SOURCE", |
| "-D_FORTIFY_SOURCE=1", |
| "-fstack-protector", |
| # All warnings are enabled. Maybe enable -Werror as well? |
| "-Wall", |
| # Enable a few more warnings that aren't part of -Wall. |
| ] + (["-Wthread-safety", "-Wself-assign"] if darwin else [ |
| # Disable some that are problematic. |
| "-Wl,-z,-relro,-z,now", |
| "-B" + str(repository_ctx.path(cc).dirname), |
| # Always have -B/usr/bin, see https://github.com/bazelbuild/bazel/issues/760. |
| "-B/usr/bin", |
| ]) + ( |
| _add_option_if_supported(repository_ctx, cc, "-Wunused-but-set-parameter") + |
| # has false positives |
| _add_option_if_supported(repository_ctx, cc, "-Wno-free-nonheap-object") + |
| # Enable coloring even if there's no attached terminal. Bazel removes the |
| # escape sequences if --nocolor is specified. |
| _add_option_if_supported(repository_ctx, cc, "-fcolor-diagnostics")) + [ |
| # Keep stack frames for debugging, even in opt mode. |
| "-fno-omit-frame-pointer", |
| ], |
| } |
| |
| # TODO(pcloudy): Remove this after MSVC CROSSTOOL becomes default on Windows |
| def _get_windows_crosstool_content(repository_ctx): |
| """Return the content of msys crosstool which is still the default CROSSTOOL on Windows.""" |
| result = repository_ctx.execute(["cygpath", "-m", "/"]) |
| if result.stderr: |
| fail(result.stderr) |
| msys_root = result.stdout.strip() |
| return ( |
| ' abi_version: "local"\n' + |
| ' abi_libc_version: "local"\n' + |
| ' builtin_sysroot: ""\n' + |
| ' compiler: "windows_msys64"\n' + |
| ' host_system_name: "local"\n' + |
| " needsPic: false\n" + |
| ' target_libc: "local"\n' + |
| ' target_cpu: "x64_windows"\n' + |
| ' target_system_name: "local"\n' + |
| ' tool_path { name: "ar" path: "%susr/bin/ar" }\n' % msys_root + |
| ' tool_path { name: "compat-ld" path: "%susr/bin/ld" }\n' % msys_root + |
| ' tool_path { name: "cpp" path: "%susr/bin/cpp" }\n' % msys_root + |
| ' tool_path { name: "dwp" path: "%susr/bin/dwp" }\n' % msys_root + |
| ' tool_path { name: "gcc" path: "%susr/bin/gcc" }\n' % msys_root + |
| ' cxx_flag: "-std=gnu++0x"\n' + |
| ' linker_flag: "-lstdc++"\n' + |
| ' cxx_builtin_include_directory: "%s"\n' % msys_root + |
| ' cxx_builtin_include_directory: "/usr/"\n' + |
| ' tool_path { name: "gcov" path: "%susr/bin/gcov" }\n' % msys_root + |
| ' tool_path { name: "ld" path: "%susr/bin/ld" }\n' % msys_root + |
| ' tool_path { name: "nm" path: "%susr/bin/nm" }\n' % msys_root + |
| ' tool_path { name: "objcopy" path: "%susr/bin/objcopy" }\n' % msys_root + |
| ' objcopy_embed_flag: "-I"\n' + |
| ' objcopy_embed_flag: "binary"\n' + |
| ' tool_path { name: "objdump" path: "%susr/bin/objdump" }\n' % msys_root + |
| ' tool_path { name: "strip" path: "%susr/bin/strip" }'% msys_root ) |
| |
| def _opt_content(darwin): |
| """Return the content of the opt specific section of the CROSSTOOL file.""" |
| return { |
| "compiler_flag": [ |
| # No debug symbols. |
| # Maybe we should enable https://gcc.gnu.org/wiki/DebugFission for opt or |
| # even generally? However, that can't happen here, as it requires special |
| # handling in Bazel. |
| "-g0", |
| |
| # Conservative choice for -O |
| # -O3 can increase binary size and even slow down the resulting binaries. |
| # Profile first and / or use FDO if you need better performance than this. |
| "-O2", |
| |
| # Disable assertions |
| "-DNDEBUG", |
| |
| # Removal of unused code and data at link time (can this increase binary size in some cases?). |
| "-ffunction-sections", |
| "-fdata-sections" |
| ], |
| "linker_flag": [] if darwin else ["-Wl,--gc-sections"] |
| } |
| |
| |
| def _dbg_content(): |
| """Return the content of the dbg specific section of the CROSSTOOL file.""" |
| # Enable debug symbols |
| return {"compiler_flag": "-g"} |
| |
| |
| def _find_cc(repository_ctx): |
| """Find the C++ compiler.""" |
| cc_name = "gcc" |
| if "CC" in repository_ctx.os.environ: |
| cc_name = repository_ctx.os.environ["CC"].strip() |
| if not cc_name: |
| cc_name = "gcc" |
| if cc_name.startswith("/"): |
| # Absolute path, maybe we should make this suported by our which function. |
| return cc_name |
| cc = repository_ctx.which(cc_name) |
| if cc == None: |
| fail( |
| "Cannot find gcc, either correct your path or set the CC" + |
| " environment variable") |
| return cc |
| |
| |
| def _find_python(repository_ctx): |
| """Find where is python on Windows.""" |
| if "BAZEL_PYTHON" in repository_ctx.os.environ: |
| return repository_ctx.os.environ["BAZEL_PYTHON"] |
| auto_configure_warning("'BAZEL_PYTHON' is not set, start finding python in PATH.") |
| python_binary = _which_cmd(repository_ctx, "python.exe", "C:\\Python27\\python.exe") |
| return python_binary |
| |
| |
| def _find_vs_path(repository_ctx): |
| """Find Visual Studio install path.""" |
| bash_bin = _which_cmd(repository_ctx, "bash.exe") |
| program_files_dir = _get_env_var(repository_ctx, "ProgramFiles(x86)", "C:\\Program Files (x86)") |
| vs_version = repository_ctx.execute([bash_bin, "-c", "ls '%s' | grep -E 'Microsoft Visual Studio [0-9]+' | sort | tail -n 1" % program_files_dir]).stdout.strip() |
| return program_files_dir + "/" + vs_version |
| |
| |
| def _find_env_vars(repository_ctx, vs_path): |
| """Get environment variables set by VCVARSALL.BAT.""" |
| vsvars = vs_path + "/VC/VCVARSALL.BAT" |
| repository_ctx.file("wrapper/get_env.bat", |
| "@echo off\n" + |
| "call \"" + vsvars + "\" amd64 \n" + |
| "echo PATH=%PATH%,INCLUDE=%INCLUDE%,LIB=%LIB% \n", True) |
| envs = repository_ctx.execute(["wrapper/get_env.bat"]).stdout.strip().split(",") |
| env_map = {} |
| for env in envs: |
| key, value = env.split("=") |
| env_map[key] = value.replace("\\", "\\\\") |
| return env_map |
| |
| |
| def _tpl(repository_ctx, tpl, substitutions={}, out=None): |
| if not out: |
| out = tpl |
| repository_ctx.template( |
| out, |
| Label("@bazel_tools//tools/cpp:%s.tpl" % tpl), |
| substitutions) |
| |
| |
| def _get_env(repository_ctx): |
| """Convert the environment in a list of export if in Homebrew.""" |
| env = repository_ctx.os.environ |
| if "HOMEBREW_RUBY_PATH" in env: |
| return "\n".join([ |
| "export %s='%s'" % (k, env[k].replace("'", "'\\''")) |
| for k in env |
| if k != "_" and k.find(".") == -1 |
| ]) |
| else: |
| return "" |
| |
| def _impl(repository_ctx): |
| repository_ctx.file("tools/cpp/empty.cc") |
| cpu_value = _get_cpu_value(repository_ctx) |
| if cpu_value == "freebsd": |
| # This is defaulting to the static crosstool, we should eventually do those platform too. |
| # Theorically, FreeBSD should be straightforward to add but we cannot run it in a docker |
| # container so escaping until we have proper tests for FreeBSD. |
| repository_ctx.symlink(Label("@bazel_tools//tools/cpp:CROSSTOOL"), "CROSSTOOL") |
| repository_ctx.symlink(Label("@bazel_tools//tools/cpp:BUILD.static"), "BUILD") |
| elif cpu_value == "x64_windows": |
| repository_ctx.symlink(Label("@bazel_tools//tools/cpp:BUILD.static"), "BUILD") |
| |
| msvc_wrapper = repository_ctx.path(Label("@bazel_tools//tools/cpp:CROSSTOOL")).dirname.get_child("wrapper").get_child("bin") |
| for f in ["msvc_cl.bat", "msvc_link.bat", "msvc_nop.bat"]: |
| repository_ctx.symlink(msvc_wrapper.get_child(f), "wrapper/bin/" + f) |
| msvc_wrapper = msvc_wrapper.get_child("pydir") |
| for f in ["msvc_cl.py", "msvc_link.py"]: |
| repository_ctx.symlink(msvc_wrapper.get_child(f), "wrapper/bin/pydir/" + f) |
| |
| python_binary = _find_python(repository_ctx) |
| _tpl(repository_ctx, "wrapper/bin/call_python.bat", {"%{python_binary}": python_binary}) |
| |
| vs_path = _find_vs_path(repository_ctx) |
| env = _find_env_vars(repository_ctx, vs_path) |
| python_dir = python_binary[0:-10].replace("\\", "\\\\") |
| include_paths = env["INCLUDE"] + (python_dir + "include") |
| lib_paths = env["LIB"] + (python_dir + "libs") |
| tmp_dir = _get_env_var(repository_ctx, "TMP", "C:\\Windows\\Temp") |
| _tpl(repository_ctx, "wrapper/bin/pydir/msvc_tools.py", { |
| "%{tmp}": tmp_dir.replace("\\", "\\\\"), |
| "%{path}": env["PATH"], |
| "%{include}": include_paths, |
| "%{lib}": lib_paths, |
| }) |
| |
| cxx_include_directories = [] |
| for path in include_paths.split(";"): |
| if path: |
| cxx_include_directories.append(("cxx_builtin_include_directory: \"%s\"" % path)) |
| _tpl(repository_ctx, "CROSSTOOL", { |
| "%{cpu}": cpu_value, |
| "%{content}": _get_windows_crosstool_content(repository_ctx), |
| "%{opt_content}": "", |
| "%{dbg_content}": "", |
| "%{cxx_builtin_include_directory}": "\n".join(cxx_include_directories) |
| }) |
| else: |
| darwin = cpu_value == "darwin" |
| cc = _find_cc(repository_ctx) |
| tool_paths = _get_tool_paths(repository_ctx, darwin, |
| "cc_wrapper.sh" if darwin else str(cc)) |
| crosstool_content = _crosstool_content(repository_ctx, cc, cpu_value, darwin) |
| opt_content = _opt_content(darwin) |
| dbg_content = _dbg_content() |
| _tpl(repository_ctx, "BUILD", { |
| "%{name}": cpu_value, |
| "%{supports_param_files}": "0" if darwin else "1", |
| "%{cc_compiler_deps}": ":cc_wrapper" if darwin else ":empty", |
| }) |
| _tpl(repository_ctx, |
| "osx_cc_wrapper.sh" if darwin else "linux_cc_wrapper.sh", |
| {"%{cc}": str(cc), "%{env}": _get_env(repository_ctx)}, |
| "cc_wrapper.sh") |
| _tpl(repository_ctx, "CROSSTOOL", { |
| "%{cpu}": cpu_value, |
| "%{content}": _build_crosstool(crosstool_content) + "\n" + |
| _build_tool_path(tool_paths), |
| "%{opt_content}": _build_crosstool(opt_content, " "), |
| "%{dbg_content}": _build_crosstool(dbg_content, " "), |
| "%{cxx_builtin_include_directory}": "" |
| }) |
| |
| |
| cc_autoconf = repository_rule(implementation=_impl, local=True) |
| |
| |
| def cc_configure(): |
| """A C++ configuration rules that generate the crosstool file.""" |
| cc_autoconf(name="local_config_cc") |
| native.bind(name="cc_toolchain", actual="@local_config_cc//:toolchain") |
