cc_library protoc_lib defines main()

[scotthart]

What version of protobuf and what language are you using?
Version: v23.1
Language: C++

What operating system (Linux, Windows, ...) and version?
Linux ... 6.1.20-2rodete1-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.20-2rodete1 (2023-04-21) x86_64 GNU/Linux

What runtime / compiler are you using (e.g., python version or gcc version)
Debian clang version 14.0.6

What did you do?
Steps to reproduce the behavior:
Ran the tests defined in
https://github.com/googleapis/google-cloud-cpp/blob/main/generator/internal/predicate_utils_test.cc
using bazel test

What did you expect to see
Tests executing as they did in protobuf v21.12

What did you see instead?
The usage error from invoking protoc without any arguments.

Make sure you include information that can help us debug (full error message, exception listing, stack trace, logs).

gdb home/username/.cache/bazel/_bazel_username/f564c2f714c6826c87550e7c5eec6cf0/execroot/google_cloud_cpp/bazel-out/k8-dbg/bin/generator/internal_predicate_utils_test
GNU gdb (GDB) 10.0-gg5
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Type "show copying" and "show warranty" for details.
This GDB was configured as "x86_64-grtev4-linux-gnu".
Type "show configuration" for configuration details.

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Reading symbols from home/username/.cache/bazel/_bazel_username/f564c2f714c6826c87550e7c5eec6cf0/execroot/google_cloud_cpp/bazel-out/k8-dbg/bin/generator/internal_predicate_utils_test...
Unable to determine compiler version.
Skipping loading of libstdc++ pretty-printers for now.
Loading libc++ pretty-printers.
Non-google3 binary detected.
(gdb) break CommandLineInterface::PrintHelpText
Function "CommandLineInterface::PrintHelpText" not defined.
Make breakpoint pending on future shared library load? (y or [n]) y
Breakpoint 1 (CommandLineInterface::PrintHelpText) pending.
(gdb) run
Starting program: home/username/.cache/bazel/_bazel_username/f564c2f714c6826c87550e7c5eec6cf0/execroot/google_cloud_cpp/bazel-out/k8-dbg/bin/generator/internal_predicate_utils_test 
BFD: /lib64/ld-linux-x86-64.so.2: unknown type [0x13] section `.relr.dyn'
BFD: /lib64/ld-linux-x86-64.so.2: unknown type [0x13] section `.relr.dyn'
BFD: /lib64/ld-linux-x86-64.so.2: unknown type [0x13] section `.relr.dyn'
BFD: /lib64/ld-linux-x86-64.so.2: unknown type [0x13] section `.relr.dyn'
warning: `/lib64/ld-linux-x86-64.so.2': Shared library architecture unknown is not compatible with target architecture i386:x86-64.
warning: `/lib64/ld-linux-x86-64.so.2': Shared library architecture unknown is not compatible with target architecture i386:x86-64.
BFD: /lib/x86_64-linux-gnu/libm.so.6: unknown type [0x13] section `.relr.dyn'
BFD: /lib/x86_64-linux-gnu/libm.so.6: unknown type [0x13] section `.relr.dyn'
BFD: /lib/x86_64-linux-gnu/libm.so.6: unknown type [0x13] section `.relr.dyn'
BFD: /lib/x86_64-linux-gnu/libm.so.6: unknown type [0x13] section `.relr.dyn'
warning: `/lib/x86_64-linux-gnu/libm.so.6': Shared library architecture unknown is not compatible with target architecture i386:x86-64.
BFD: /lib/x86_64-linux-gnu/libc.so.6: unknown type [0x13] section `.relr.dyn'
BFD: /lib/x86_64-linux-gnu/libc.so.6: unknown type [0x13] section `.relr.dyn'
BFD: /lib/x86_64-linux-gnu/libc.so.6: unknown type [0x13] section `.relr.dyn'
BFD: /lib/x86_64-linux-gnu/libc.so.6: unknown type [0x13] section `.relr.dyn'
warning: `/lib/x86_64-linux-gnu/libc.so.6': Shared library architecture unknown is not compatible with target architecture i386:x86-64.

Breakpoint 1, 0x00007ffff684c0a0 in google::protobuf::compiler::CommandLineInterface::PrintHelpText()@plt ()
   from home/username/.cache/bazel/_bazel_username/f564c2f714c6826c87550e7c5eec6cf0/execroot/google_cloud_cpp/bazel-out/k8-dbg/bin/generator/../_solib_k8/libexternal_Scom_Ugoogle_Uprotobuf_Ssrc_Sgoogle_Sprotobuf_Scompiler_Slibcommand_Uline_Uinterface.so
(gdb) bt
#0  0x00007ffff684c0a0 in google::protobuf::compiler::CommandLineInterface::PrintHelpText()@plt ()
   from home/username/.cache/bazel/_bazel_username/f564c2f714c6826c87550e7c5eec6cf0/execroot/google_cloud_cpp/bazel-out/k8-dbg/bin/generator/../_solib_k8/libexternal_Scom_Ugoogle_Uprotobuf_Ssrc_Sgoogle_Sprotobuf_Scompiler_Slibcommand_Uline_Uinterface.so
#1  0x00007ffff685ef5b in google::protobuf::compiler::CommandLineInterface::ParseArguments (this=0x7fffffffd520, argc=1, 
    argv=0x7fffffffd8b8) at external/com_google_protobuf/src/google/protobuf/compiler/command_line_interface.cc:1634
#2  0x00007ffff685c52c in google::protobuf::compiler::CommandLineInterface::Run (this=0x7fffffffd520, argc=1, argv=0x7fffffffd8b8)
    at external/com_google_protobuf/src/google/protobuf/compiler/command_line_interface.cc:1107
#3  0x00007ffff7035033 in google::protobuf::compiler::ProtobufMain (argc=1, argv=0x7fffffffd8b8)
    at external/com_google_protobuf/src/google/protobuf/compiler/main.cc:120
#4  0x00007ffff7035635 in main (argc=1, argv=0x7fffffffd8b8) at external/com_google_protobuf/src/google/protobuf/compiler/main.cc:128
#5  0x00007ffff422618a in __libc_start_call_main () at ../sysdeps/nptl/libc_start_call_main.h:58
#6  0x00007ffff4226245 in __libc_start_main_impl (main=<error reading variable: Cannot access memory at address 0xffffd850>, argc=1, 
    argv=0x7fffffffd8b8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, 
    stack_end=<error reading variable: Cannot access memory at address 0xffffd8a0>) at ../csu/libc-start.c:381
#7  0x00005555555648c1 in _start ()
(gdb) 

Anything else we should know about your project / environment
Instead of the main() from gtest_main being executed, the main() from protoc_lib was executed.
I would not expect to find main defined in a cc_library rule.

protobuf/src/google/protobuf/compiler/BUILD.bazel defines:

cc_library(
    name = "protoc_lib",
    srcs = [
        "main.cc",
    ],
    copts = COPTS,
    visibility = [
        "//:__pkg__",
        "//pkg:__pkg__",
    ],
    deps = [
        ":code_generator",
        ":command_line_interface",
        ":importer",
        "//src/google/protobuf:protobuf_nowkt",
        "//src/google/protobuf/compiler/cpp",
        "//src/google/protobuf/compiler/csharp",
        "//src/google/protobuf/compiler/java",
        "//src/google/protobuf/compiler/objectivec",
        "//src/google/protobuf/compiler/php",
        "//src/google/protobuf/compiler/python",
        "//src/google/protobuf/compiler/ruby",
        "//src/google/protobuf/compiler/rust",
        "@com_google_absl//absl/log:initialize",
    ],
)

protobuf/src/google/protobuf/compiler/main.cc defines:

int main(int argc, char* argv[]) {
  return google::protobuf::compiler::ProtobufMain(argc, argv);
}

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