Can't debug inside library project

[graph]

Setup. 2 projects app project and libModule. This bug has 2 parts which I think are related so I'm putting both parts here.

Part 1: Can't debug library project, setting breakpoints do not work. And when a segfault happens ndk breaks in "unknown function` and nothing useful can be done.

A workaround solution is in the main project do this:

        // default config
        externalNativeBuild {
            cmake {
                abiFilters'armeabi-v7a'
                arguments "-DANDROID_PLATFORM=android-${platformVersion}",
                        '-DANDROID_TOOLCHAIN=clang', '-DANDROID_STL=gnustl_shared'
            }
        }
    // in android {}
    externalNativeBuild {
        cmake {
            path "../libModule/src/main/cpp/CMakeLists.txt"
        }
    }

and I can debug just fine. So far it's fine. This has the disadvantage of compiling everything twice.

part 2: Library project always compiles in the release folder .externalNativeBuild regardless what has been specified. Interesting though if I do "Build->build APK" in android studio RC2 it builds the debug build.

Some discussion here

Some version specifiers

Android Studio 2.2 RC 2
Build #AI-145.3253452, built on September 7, 2016
JRE: 1.8.0_76-release-b03 x86_64
JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o

classpath 'com.android.tools.build:gradle:2.2.0-rc2'

compileSdkVersion 24
buildToolsVersion "24.0.2"

            cmake {
                abiFilters'armeabi-v7a'
                arguments "-DANDROID_PLATFORM=android-19",
                        '-DANDROID_TOOLCHAIN=clang', '-DANDROID_STL=gnustl_shared'
            }

[DanAlbert]

I assume you're debugging with LLDB (via Android Studio) and not GDB (via ndk-gdb), right?

[graph]

Yes via Android Studio. I'm pressing the Debug App button with everything at defaults in android studio RC2. Everything is at defaults:

Target channels: lldb process:gdb-remote packets
Debug Type: Hybrid

Is there instructions for how to use ndk-gdb with new cmake system? I haven't looked into ndk-gdb at all.

[DanAlbert]

I think ndk-gdb is only set up to work with ndk-build projects, but @jmgao can correct me if I'm wrong.

For the Studio and LLDB issues, none of those components are actually in the NDK. Could you file a bug against Android Studio so they can take a look at it? http://tools.android.com/filing-bugs

[graph]

Ok filed under Android Studio.

[mondaugen]

I know this is closed but I found this when having the same problem. I found a solution that worked for me:
If your external library is built with debugging symbols, you might have to do
add-dsym /path/to/shared/library
in the LLDB console to get the debugging info. You can set a breakpoint at some main point that you know is getting called, then use breakpoint command add to run commands loading the missing debugger symbols.

[knumat]

I spent a few hours trying to make the debugger actually stop on a breakpoint in some native C++ code that was built into a library. Eventually I got it working by doing the following (under Android Studio 3.3.1). Hopefully this helps someone else!

• Select Run -> Edit Configurations
• On the left side, select Android App -> app
• On the right side, select the Debugger tab
• Under the Symbol Directories sub-tab, press the + button
• Browse to the following path:
  libModule/build/intermediates/cmake/debug/obj
• In the Build Variants window, select the "debug" configuration for the app

[Amoystyle]

if you use "set(CMAKE_C_FLAGS/CMAKE_CXX_FLAGS "")" in CMakeLists.txt, it will overwrite the compiler default mode, causing debug symbols to be lost.

TODO：
set(CMAKE_C_FLAGS “${CMAKE_C_FLAGS} ”}
set(CMAKE_CXX_FLAGS “${CMAKE_CXX_FLAGS} ”)

[JessHolle]

I spent a few hours trying to make the debugger actually stop on a breakpoint in some native C++ code that was built into a library. Eventually I got it working by doing the following (under Android Studio 3.3.1). Hopefully this helps someone else!

• Select Run -> Edit Configurations
• On the left side, select Android App -> app
• On the right side, select the Debugger tab
• Under the Symbol Directories sub-tab, press the + button
• Browse to the following path:
  libModule/build/intermediates/cmake/debug/obj
• In the Build Variants window, select the "debug" configuration for the app

Yes, this did help me. And I see the issue here was closed and one opened in Android Studio -- as I was about to gripe that this should be automatic in Android Studio.

[alexsorokoletov]

Thank you, this is the only thing that helped 🥳
Could not debug C++/native android code, tried everything from SO and other sources I could find and this is the only thing that made the change. I am using Android Studio 4 (4.1) and MacOS
#197 (comment)

[JessHolle]

@alexsorokoletov I should note that I no longer have to do this in Android Studio 4.1.x with the Android Gradle Plugin 4.1.x -- thankfully.