How to debug cross-platform C++ programs?

To debug cross-platform C++ programs, you can use GDB remote debugging or LLDB remote debugging: GDB remote debugging: Install the GDB server on the target system and compile the target program. Use GDB on the host system to connect to the target server for debugging. LLDB remote debugging: Install LLDB on the host system and compile the target program. Start the LLDB server on the target system and connect to the host system for debugging.

#How to debug a cross-platform C++ program?

Introduction

Debugging cross-platform C++ programs can be challenging because they can run on different operating systems and compilers.この记事 provides a guide to debugging cross-platform C++ programs using GDB remote debugging and LLDB remote debugging.

GDB remote debugging

1. GDB server installation: Install the GDB server (gdbserver) on the target system .
2. Target program compilation: Compile the target program using GDB-compatible flags, such as -g and -gdwarf=2.
3. Start the GDB server: On the target system, run gdbserver :port number target executable , where port number is any unused port.
4. Remote attachment: On the host system, use the gdb tool and remotely attach to the target server: (gdb) target remote :localhost:port number.
5. Debugging: It is now possible to remotely debug the target program on the host system.

LLDB Remote Debugging

1. LLDB Installation: Install the LLDB debugger on the host system.
2. Target program compilation: Compile the target program using LLDB-compatible flags, such as -g and -fvisibility=hidden.
3. LLDB server startup: On the target system, run lldb-server platform --listen :port number :program path.
4. Remote connection: On the host system, run lldb and connect remotely to the target server: (lldb) platform connect connect://localhost:port Number.
5. Debugging: It is now possible to remotely debug the target program on the host system.

Practical case

Use GDB to remotely debug a simple cross-platform program:

• Target .cpp source code:

#include <iostream>

int main() {
  std::cout << "Hello from Target!" << std::endl;
  return 0;
}

• Compile Target.cpp:

g++ -g -gdwarf=2 Target.cpp -o Target

• Start GDB server:

gdbserver :1234 Target

• Remotely attach to the server:

gdb
(gdb) target remote localhost:1234

• Set breakpoints and debug:

(gdb) break main
(gdb) run

Use LLDB to remotely debug a simple cross-platform program :

• Target.cpp Source code:

#include <iostream>

int main() {
  std::cout << "Hello from Target!" << std::endl;
  return 0;
}

• Compile Target.cpp:

clang++ -g -fvisibility=hidden Target.cpp -o Target

• Start the LLDB server:

lldb-server platform --listen :1234 ./Target

• Connect to the server remotely:

lldb
(lldb) platform connect connect://localhost:1234

• Set breakpoints and debug:

(lldb) breakpoint set -n main
(lldb) run

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