How to debug a Gradle cpp application with GDB?


I recently got started with gradle for c++ and seems great. However, I yet wasn’t able to debug my app with GDB. So, here is my simple app:

apply plugin: 'cpp'

model {
    components {
    	hello(NativeLibrarySpec) {
            binaries.all {
                cppCompiler.define "HELLO_EXPORT"
        main(NativeExecutableSpec) {
            binaries.all {
                lib library: "hello"
                cppCompiler.args "-g"

Basically, I got a main at src/main/cpp and a module at src/hello/cpp. I’m simply trying to compile this project with the argument -g in order to be able to debug it with GDB. So I just installed the project with gradle clean build installMainExecutable and it was succesfull, I can actually run my application with ./build/install/main/main, however this main is a script, so I can’t use gdb on it, so I tried to run gdb with ./build/install/main/lib/main and it loads succesfully, however when I actually run the program, gdb says it could not find the shared libraries: error while loading shared libraries:

So, what am I getting wrong? Is there a way of debugging with that main shell script? Or should I just keep looking on how to load the shared libraries “by hand” with GDB?

Best Regards, Ernani

If you look at the script generated by the install task, one of the key things it does it set the library path environment variables. If you set LD_LIBRARY_PATH (or DYLD_LIBRARY_PATH depending on your OS) when running gdb, it should find the missing libs.

For example, on Linux:

LD_LIBRARY_PATH=build/install/main/lib gdb build/install/main/lib/main
1 Like

Thanks a lot @Chris_Dore, that solved my issue.