[Bug]: Log does not seem to write to stdout

[eugeneo]

Describe the issue

I can not see infos/warnings, no matter what I set --minloglevel to. Setting --stderrthreshold=0 works as expected.

Steps to reproduce the problem

Code:

int main(int argc, char** argv) {
  absl::SetProgramUsageMessage("Echo server");
  absl::ParseCommandLine(argc, argv);
  absl::InitializeLog();
  std::cout << "Hello, world!" << std::endl;
  LOG(INFO) << "Info";
  LOG(WARNING) << "Warning";
  LOG(ERROR) << "Error";
  return 0;
}

Bazel build:

cc_binary(
  name = "echo_server",
  srcs = [
    "echo_server.cc",
  ],
  deps = [
    "@com_google_absl//absl/flags:parse",
    "@com_google_absl//absl/log",
    "@com_google_absl//absl/log:flags",
    "@com_google_absl//absl/log:initialize",
  ],
)

Command line:
bazel run //src/tools:echo_server -- --minloglevel=0

What version of Abseil are you using?

abseil-cpp-20230802.0

What operating system and version are you using?

Ubuntu 22.04.3 LTS x86/64

What compiler and version are you using?

gcc version 11.4.0 (Ubuntu 11.4.0-1ubuntu1~22.04)

What build system are you using?

Bazel 6.3.2

Additional context

No response

[derekmauro]

I'm not sure what you think the expected behavior is here. Logging writes to stderr (not stdout) when --stderrthreshold is set to the appropriate level, and you say that is working.

--minloglevel controls whether the logging infrastructure runs at all for a particular logging level.

If you want logs to go somewhere besides stderr, you need to use absl::AddLogSink().