CLion Fails to Debug cc_binary target on macOS

[dwtj]

The Problem

I've written a hello world cc_binary target, but my attempts to debug it from within CLion fail.

I've created a repository, dwtj/clwb-bugs-example, to demonstrate the problem. It includes analogous CMake and Bazel builds of this program.

When I use CLion+CMake, I can debug hello_world just fine, but when I try to debug it with CLion+Bazel, I get a red popup error. The image below shows these two projects side-by-side:

The red popup error says:

Error running 'Bazel run :hello_world':
Debugger executable not specified Configure

Here, "Configure" is a link to CLion's "Preferences" > "Build, Execution, Deployment" > "Toolchains". Here's what that looks like for me:

There are three choices in the "Debugger" drop-down menu:

• Bundled LLDB
• Bundled GDB
• Custom GDB Executable

Note that there doesn't seem to be a "Custom LLDB" option. For varying reasons, all of these options fail in my CLion+Bazel project.

Bundled LLDB

As described above, "Bundled LLDB" seems to work fine in CLion+CMake, but it fails with the red popup error in CLion+Bazel.

Bundled GDB

When I chose this option, I get "a file format not recognized error." This happens for both CLion+CMake and CLion+Bazel.

I guess this makes sense, since my Clang/LLVM toolchain is building the program in either case, and evidently GDB won't work on a Clang-built executable. Here's the image:

Custom GDB Executable:

I don't have GCC/GDB installed on my system, so I don't have a "Custom GDB Executable" to select.

However, if I try to use /usr/bin/lldb as a Custom GDB Executable, I get an error: lldb: unrecognized option '-interpreter=mi2'. As you might expect, this happens for both CLion+CMake and CLion+Bazel. Here's the image:

My Testing Environment

• macOS 10.14.2 (Mojave)
• CLion v2018.2.7 (Though CLion v2018.3.0+ are more recent, they don't seem to
  be compatible with the latest versions of the plugin.)
• Two versions of the plugin, https://github.com/bazelbuild/intellij:
  • v2018.12.03.0.2 (latest pre-built release, retrieved within CLion)
  • 0f45ef4 (built from source)
• File System: APFS (Case-sensitive, Encrypted)

$ xcodebuild -version
Xcode 10.1
Build version 10B61
$ c++ --version
Apple LLVM version 10.0.0 (clang-1000.11.45.5)
Target: x86_64-apple-darwin18.2.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
$ bazel version
WARNING: --batch mode is deprecated. Please instead explicitly shut down your Bazel server using the command "bazel shutdown".
INFO: Invocation ID: d1b8eba4-dc65-4103-9351-c84a51b0c384
Build label: 0.21.0
Build target: bazel-out/darwin-opt/bin/src/main/java/com/google/devtools/build/lib/bazel/BazelServer_deploy.jar
Build time: Wed Dec 19 12:57:09 2018 (1545224229)
Build timestamp: 1545224229
Build timestamp as int: 1545224229

Questions

• Is it possible that my Clang/LLVM/LLDB toolchain just isn't yet supported by the plugin?
• If that is the case, how can I work around this?
• Do I need to instead use a GCC/GDB toolchain?
• If so, how should I configure my Bazel workspace, a cc_binary target, and a cc_library target to use another toolchain?
• Is this related to Debugging C++ on MacOS does not work bazel#6327? When I use CLI lldb on my hello_world project, I see the same kind of thing in that issue. Might switching to a GCC/GDB toolchain at least let me use CLI gdb on my Bazel cc_binary targets?

[dwtj]

FYI: The above-described problem is still observed when the environment variable BAZEL_USE_CPP_ONLY_TOOLCHAIN is set, as suggested here: #109 (comment)

[brownry1986]

I am encountering the same issue with the latest versions of CLion and the Bazel plugin:

CLion version: CLion 2018.3.4
Bazel Plugin version: v2019.01.28.0.2

[songemeng]

I have the same problem. Bazel run is successful, but Debug fails. When I use the gdb which version is 7.11.1, I get an exit code 126.

[songemeng]

I got a solution for my situation.

1. find the path of your gdb, such as /home/username/.CLion2018.3/config/plugins/clwb/gdb/. You
2. sudo chmod a+x gdbserver

[blairmatte]

Also encountering this issue, same symptoms.

CLion version: 2018.3.4
Bazel Plugin version: v2019.03.05.0.1
cc version: Apple LLVM version 10.0.0 (clang-1000.11.45.5)

The suggestion above to chmod a+x gdbserver did not help for me. Happy to help debug or test solutions!

[codingrhythm]

I am having the same issue. Is there a workaround, or work in progress to solve this issue?

[chaoren]

The solution from #494 (comment) still works, you have to chmod the correct gdbserver.

$ chmod +x $HOME/.CLion2018.3/config/plugins/clwb/gdb/gdbserver

if you're using CLion 2018.3.

$ chmod +x $HOME/.CLion2019.1/config/plugins/clwb/gdb/gdbserver

if you're using CLion 2019.1.

[chaoren]

If you download the plugin zip directly from here, and unzip into your plugins directory, it should also work. For some reason when you install it via the IDE marketplace it doesn't preserve the permissions.

[blairmatte]

@chaoren This issue is specifically for macOS. I think your solution applies only for Linux. On macOS the folders you are describing do not exist. The corresponding folder on macOS appears to be $HOME/Library/Application\ Support/CLion2018.3/clwb/gdb/gdbserver. When I add execution permissions to this file there is no change to the debugging error in CLion.

[chaoren]

Yes, sorry, I only saw the last few comments on the issue. On mac we shouldn't be using the script at all.

[steeve]

@chaoren do you have an idea of what needs to be done ?

[chaoren]

I'm hoping this would fix the issue, but since I don't have access to a mac at the moment, could I ask one of you people to build and test that patch to see if it works first?

[steeve]

I'll take a shot, thank you!

[steeve]

@chaoren Happy to report that it's working!

Attaching the build from the PR for other to use until it's released.

clwb_bazel.zip

[chaoren]

Excellent. I will merge the patch shortly.

[steeve]

That said, debugging itself doesn't work because of bazelbuild/bazel#6327

[dwtj]

Why was this closed? As @steeve said, debugging in CLion on macOS still doesn't work.

[chaoren]

The issue with the bazel plugin has been fixed. The other issue is in bazel, you should follow that other bug. There's nothing actionable on this bug anymore.

[wesleyw72]

Would this be fixed if we launched debugserver using the run_under flag, much like how gdbserver is used on Linux? That would then be executed in the sandbox which should still have the debug symbols intact.

[mikepii]

I think there's still another issue with the plugin on macOS (separate from the red popup error which seems to have been fixed, and separate from bazel issue bazelbuild/bazel#6327).

There's a workaround discussed in bazelbuild/bazel#6327: adding --spawn_strategy=standalone. I added that to my CLion run configuration. Contrary to before, now the executable that gets generated when I click "Debug" in CLion works correctly in lldb itself (I can set and stop at breakpoints and see the source). Also, CLion will now stop and highlight the correct line if I cause an exception e.g. with return *(int*)0;. But CLion still won't stop at breakpoints.

I'm using plugin version 2019.11.14.0.1 and I also tried the patched version in #494 (comment) above (same behavior). CLion does seem to be using LLDB because the Debug tool window includes a functioning LLDB shell.

[wesleyw72]

Please can we reopen this issue? It is definitely still broken. @chaoren

[cloggo]

Please can we reopen this issue? It is definitely still broken. @chaoren

At least for Mac it is is still broken.

[wesleyw72]

I have a workaround which may be useful for others.

1. Ensure that sandboxing is disabled. This involves setting --spawn_strategy=local and rebuilding to ensure that the files necessary for debugging aren't hidden away in the sandbox.
2. Setup an .lldbinit to have an entry such as settings set target.source-map . <path_to_repo>. This enables breakpoints to be resolved correctly.
3. If using Runfiles, you may have to setup variables such as TEST_SRCDIR as they aren't setup due to lldb not being run under bazel.

[chnlior-click]

@wesleyw72 , thank you very much.
I can confirm that the settings set target.source-map . <path_to_repo> made the magic and CLion breakpoints are finally working.

Another tip is that .lldbinit can be done in a project level as explained here

[CaichaoGitHub]

@dwtj could you debug on macos with clion ?

i built your project < example > successfully and i could run it directly , but i can't debug it
clion just stuck on debug state and disable my breakpoints,

my environment:
xcode : 12.0
clion: v2019.3.6
bazel plugin : v2020.07.13
bazel : release 3.5.0

[sgowroji]

Hi there! We're doing a clean up of old issues and will be closing this one. Please reopen if you’d like to discuss anything further. We’ll respond as soon as we have the bandwidth/resources to do so.