用于Bazel的Mingw-w64工具链Ubuntu 20.04.1

问题描述

我正在尝试使用Bazel在Ubuntu上为mingw-w64创建我的工具链。我正在学习本教程：https://docs.bazel.build/versions/master/tutorial/cc-toolchain-config.html。但是，当我尝试使编译器路径适应mingw64安装的路径时，出现以下错误：

bazel build --config=mingw_config -s //main:hello-world --verbose_failures
Starting local Bazel server and connecting to it...
INFO: Analyzed target //main:hello-world (16 packages loaded,46 targets configured).
INFO: Found 1 target...
SUBCOMMAND: # //main:hello-world [action 'Compiling main/hello-world.cc',configuration: a79594d39f0782b210e102e89b8a67dda26e295f95805aa9c0140f6281fdd3f5,execution platform: @local_config_platform//:host]
(cd /home/federica/.cache/bazel/_bazel_federica/fb36143429cca4c38e61a5e83150e333/execroot/__main__ && \
  exec env - \
    PATH=/home/federica/.cache/bazelisk/downloads/bazelbuild/bazel-3.5.0-linux-x86_64/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin \
    PWD=/proc/self/cwd \
  /usr/bin/x86_64-w64-mingw32-gcc -MD -MF bazel-out/k8-fastbuild/bin/main/_objs/hello-world/hello-world.d '-frandom-seed=bazel-out/k8-fastbuild/bin/main/_objs/hello-world/hello-world.o' -iquote . -iquote bazel-out/k8-fastbuild/bin -iquote external/bazel_tools -iquote bazel-out/k8-fastbuild/bin/external/bazel_tools -c main/hello-world.cc -o bazel-out/k8-fastbuild/bin/main/_objs/hello-world/hello-world.o)
SUBCOMMAND: # //main:hello-world [action 'Linking main/hello-world',execution platform: @local_config_platform//:host]
(cd /home/federica/.cache/bazel/_bazel_federica/fb36143429cca4c38e61a5e83150e333/execroot/__main__ && \
  exec env - \
    PATH=/home/federica/.cache/bazelisk/downloads/bazelbuild/bazel-3.5.0-linux-x86_64/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin \
    PWD=/proc/self/cwd \
  /usr/bin/x86_64-w64-mingw32-gcc -o bazel-out/k8-fastbuild/bin/main/hello-world bazel-out/k8-fastbuild/bin/main/_objs/hello-world/hello-world.o -Wl,-S -lstdc++)
ERROR: /home/federica/examples/cpp_mingw_toolchain/stage1/main/BUILD:3:10: output 'main/hello-world' was not created
ERROR: /home/federica/examples/cpp_mingw_toolchain/stage1/main/BUILD:3:10: not all outputs were created or valid
Target //main:hello-world Failed to build
INFO: Elapsed time: 9.390s,Critical Path: 0.58s
INFO: 2 processes: 2 linux-sandBox.
Failed: Build did NOT complete successfully

，如果我在bazel-out/k8-fastbuild/bin/main/hello-world内部查看，则不会创建可执行文件。但是，如果我尝试在bash中运行，则从verbose_failures指示的单个命令为：

cd /home/federica/.cache/bazel/_bazel_federica/fb36143429cca4c38e61a5e83150e333/execroot/__main__ && \
 exec env - \
   PATH=/home/federica/.cache/bazelisk/downloads/bazelbuild/bazel-3.5.0-linux-x86_64/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin \
   PWD=/proc/self/cwd \
 /usr/bin/x86_64-w64-mingw32-gcc -o bazel-out/k8-fastbuild/bin/main/hello-world bazel-out/k8-fastbuild/bin/main/_objs/hello-world/hello-world.o -Wl,-S -lstdc++

成功创建了可执行文件“ Hello-world.exe”。

有什么问题的建议吗？

下面是我的工具链构建文件

package(default_visibility = ["//visibility:public"])

cc_toolchain_suite(
    name = "mingw_suite",toolchains = {
        "k8": ":k8_toolchain",},)



filegroup(name = "empty")

cc_toolchain(
    name = "k8_toolchain",toolchain_identifier = "k8-toolchain",toolchain_config = ":k8_toolchain_config",all_files = ":empty",compiler_files = ":empty",dwp_files = ":empty",linker_files = ":empty",objcopy_files = ":empty",strip_files = ":empty",supports_param_files = 0,)

load(":cc_toolchain_config.bzl","cc_toolchain_config")
cc_toolchain_config(name = "k8_toolchain_config")

和cc_toolchain_config.bzl：

load("@bazel_tools//tools/build_defs/cc:action_names.bzl","ACTION_NAMES")
   # NEW
load(
    "@bazel_tools//tools/cpp:cc_toolchain_config_lib.bzl","feature","flag_group","flag_set","tool_path",)

all_link_actions = [ # NEW
    ACTION_NAMES.cpp_link_executable,ACTION_NAMES.cpp_link_dynamic_library,ACTION_NAMES.cpp_link_nodeps_dynamic_library,]


def _impl(ctx):
    tool_paths = [ # NEW
        tool_path(
            name = "gcc",path = "/usr/bin/x86_64-w64-mingw32-gcc",),tool_path(
            name = "ld",path = "/usr/bin/x86_64-w64-mingw32-ld",tool_path(
            name = "ar",tool_path(
            name = "cpp",path = "/bin/false",tool_path(
            name = "gcov",tool_path(
            name = "nm",tool_path(
            name = "objdump",tool_path(
            name = "strip",]
    
    
    
    features = [ # NEW
        feature(
            name = "default_linker_flags",enabled = True,flag_sets = [
                flag_set(
                    actions = all_link_actions,flag_groups = ([
                        flag_group(
                            flags = [
                                "-lstdc++",],]),]
    return cc_common.create_cc_toolchain_config_info(
        ctx = ctx,features = features,# NEW
        cxx_builtin_include_directories = [ # NEW
        "/usr/x86_64-w64-mingw32/include","/usr/lib/gcc/x86_64-w64-mingw32/9.3-win32/include/c++","/usr/share/mingw-w64/include","/usr/lib/gcc/x86_64-w64-mingw32/9.3-win32/include","/usr/lib/gcc/x86_64-w64-mingw32/9.3-win32/include-fixed","/usr/include",host_system_name = "local",target_system_name = "local",target_cpu = "k8",target_libc = "unkNown",compiler = "i686-w64-mingw32-gcc",abi_version = "unkNown",abi_libc_version = "unkNown",tool_paths = tool_paths,)

cc_toolchain_config = rule(
    implementation = _impl,attrs = {},provides = [CcToolchainConfigInfo],)

非常感谢您的帮助！

解决方法

该问题相对容易遗漏，但实际上已经包含在您的问题中，错误表明尚未创建hello-world，而显然已经产生了hello-world.exe。也就是说，实际上我们已经构建了一个带有后缀.exe的文件，但是并没有通过工具链配置告诉bazel，并且在没有它的情况下无法期望输出。

要解决此问题，您还可以加载artifact_name_pattern中的@bazel_tools//tools/cpp:cc_toolchain_config_lib.bzl和其他符号，然后将artifact_name_patterns的{{1}}属性设置为：

cc_common.create_cc_toolchain_config_info()

bazel c++mingw-w64 ubuntu