[英]Using bazel how does one build and install a c++ library that depends on protobuf?
I am building a 32bit c++ library that has the following dependencies我正在构建一个具有以下依赖项的 32 位 C++ 库
#include <google/protobuf/message.h>
#include <google/protobuf/descriptor.h>
#include <google/protobuf/arena.h>
#include <google/protobuf/compiler/importer.h>
#include <google/protobuf/dynamic_message.h>
with the following as a BUILD.bazel file将以下内容作为 BUILD.bazel 文件
COPTS = select({
"//conditions:default": [
"-Wall",
"-m32",
"-fPIC"
],
})
LINK_OPTS = select({
"//conditions:default": [
"-m32",
"-fPIC",
# "-lpthread",
# "-lprotobuf",
# "-pthread"
],
})
.. proto libraries ...
cc_library(
name = "proto_example",
srcs = [
....
],
hdrs = glob([
...
]),
copts = COPTS,
includes = ["src/", "./"],
linkopts = LINK_OPTS,
visibility = ["//visibility:public"],
deps = [
"@com_google_protobuf//:protobuf",
":cpp_examples_proto"
]
)
And the following as the WORKSPACE file:以下是 WORKSPACE 文件:
workspace(name = "protobufkdb")
load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
http_archive(
name = "rules_proto_grpc",
sha256 = "7954abbb6898830cd10ac9714fbcacf092299fda00ed2baf781172f545120419",
strip_prefix = "rules_proto_grpc-3.1.1",
urls = ["https://github.com/rules-proto-grpc/rules_proto_grpc/archive/3.1.1.tar.gz"],
)
load("@rules_proto_grpc//:repositories.bzl", "rules_proto_grpc_toolchains", "rules_proto_grpc_repos")
rules_proto_grpc_toolchains()
rules_proto_grpc_repos()
load("@rules_proto//proto:repositories.bzl", "rules_proto_dependencies", "rules_proto_toolchains")
rules_proto_dependencies()
rules_proto_toolchains()
load("@rules_proto_grpc//cpp:repositories.bzl", rules_proto_grpc_cpp_repos = "cpp_repos")
rules_proto_grpc_cpp_repos()
# C++
load("@rules_proto_grpc//cpp:repositories.bzl", "cpp_repos")
cpp_repos()
load("@com_github_grpc_grpc//bazel:grpc_deps.bzl", "grpc_deps")
grpc_deps()
http_archive(
name = "com_google_protobuf",
sha256 = "c6003e1d2e7fefa78a3039f19f383b4f3a61e81be8c19356f85b6461998ad3db",
strip_prefix = "protobuf-3.17.3",
urls = ["https://github.com/protocolbuffers/protobuf/archive/v3.17.3.tar.gz"],
)
However when I include/embed the library in a given client I am presented with the error:但是,当我在给定的客户端中包含/嵌入库时,会出现以下错误:
undefined symbol: _ZTIN6google8protobuf8compiler23MultiFileErrorCollectorE
The following is evident thereof:以下是显而易见的:
c++filt _ZTIN6google8protobuf8compiler23MultiFileErrorCollectorE c++filt_ZTIN6google8protobuf8compiler23MultiFileErrorCollectorE
typeinfo for google::protobuf::compiler::MultiFileErrorCollector google::protobuf::compiler::MultiFileErrorCollector 的类型信息
I have tried linking protobuf by uncommenting -lprotobuf in the link opts?: results in /usr/bin/ld.gold: error: cannot find -lprotobuf
during the build?我已经尝试通过在链接 opts 中取消注释 -lprotobuf 来链接 protobuf?:导致/usr/bin/ld.gold: error: cannot find -lprotobuf
在构建过程中/usr/bin/ld.gold: error: cannot find -lprotobuf
?
The problem here is that protobuf is being build as a 32 library on a 64 bit system and the system protobuf installation is being used ie apt-get install protobuf etc..
这里的问题是 protobuf 在 64 位系统上构建为 32 个库,并且正在使用系统 protobuf 安装,即apt-get install protobuf etc..
This is the first time I am using bazel.这是我第一次使用 bazel。 And thus as opposed to cmake where one could use DCMAKE_PREFIX_PATH to specify the install dir of protobuf.因此,与可以使用 DCMAKE_PREFIX_PATH 指定 protobuf 的安装目录的 cmake 不同。 How should one link a 32bit c++ library with protobuf such that it can be used without throwing symbol errors?应该如何将 32 位 C++ 库与 protobuf 链接起来,以便可以在不抛出符号错误的情况下使用它?
Could anyone provide me with some insight on how to get this working?任何人都可以向我提供有关如何使其工作的一些见解吗? Thanks谢谢
Use --copt=-m32 --linkopt=-m32
(on the command line) instead of copts
and linkopts
.使用--copt=-m32 --linkopt=-m32
(在命令行上)而不是copts
和linkopts
。
Having protobuf in deps
is what tells bazel to link against it.在deps
有 protobuf 是告诉 bazel 链接它的原因。 If you want to do a 32-bit build, -m32
needs to be used when compiling everything.如果要进行 32 位构建,则在编译所有内容时都需要使用-m32
。 Currently you only have it while compiling and linking your target, so it's trying to link against a 64-bit protobuf.目前您只有在编译和链接目标时才拥有它,因此它试图链接到 64 位 protobuf。
If you don't want to type those command line flags every time you build, put build --copt=-m32 --linkopt=-m32
in a .bazelrc file next to your WORKSPACE.如果您不想每次构建时都键入这些命令行标志,请将build --copt=-m32 --linkopt=-m32
放在 WORKSPACE 旁边的.bazelrc 文件中。
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