Bazel构建依赖{fmt}动态库的C++项目报错，求解决方案

错误原因 #

• cc_import中shared_library字段使用相对路径libfmt.so，Bazel会在当前main包目录下查找该文件，但实际系统动态库位于/usr/lib64，导致文件找不到
• cc_binary中额外添加linkopts = ["-lfmt"]属于冗余配置，会干扰Bazel的依赖管理逻辑

正确修改方案 #

1. 修正cc_import配置 #

通过绝对路径指定系统动态库位置，同时配置头文件路径确保编译时能找到fmt的头文件：

cc_import(
    name = "fmt",
    hdrs = glob(["/usr/include/fmt/*.h"]),  # 引入系统中fmt的头文件集合
    shared_library = "/usr/lib64/libfmt.so",  # 指定系统动态库的绝对路径
    visibility = ["//visibility:public"],
)

2. 简化cc_binary配置 #

移除冗余的linkopts配置，让Bazel通过依赖链自动处理链接逻辑：

cc_binary(
    name = "main",
    srcs = ["main.cc"],
    deps = [":lib"],
    linkstatic = 0,
)

完整修改后的BUILD文件 #

cc_import(
    name = "fmt",
    hdrs = glob(["/usr/include/fmt/*.h"]),
    shared_library = "/usr/lib64/libfmt.so",
    visibility = ["//visibility:public"],
)

cc_library(
    name = "lib",
    hdrs = ["lib.hpp"],
    srcs = ["lib.cc"],
    deps = [":fmt"],
    visibility = ["//visibility:public"],
    linkstatic = 0,
)

cc_binary(
    name = "main",
    srcs = ["main.cc"],
    deps = [":lib"],
    linkstatic = 0,
)

验证构建 #

执行以下命令重新构建：

bazel build //main:main

运行生成的二进制文件：

./bazel-bin/main/main

内容的提问来源于stack exchange，提问作者Boris