来自 Android Studio 的详细构建日志

Question

How do I get a verbose log (including the command-line arguments to compiler and linker) when building with Android Studio?

I have just transitioned from Ant / Android.mk builds to Android-Studio builds. With the old system, I was able to see how the compiler was evoked by doing:

$ ndk-build V=1

What would be the equivalent setting in Android Studio to accomplish this? I have a suspicion that my project is building against the wrong GLES version (gles2 instead of gles3) and want to make sure by seeing the command line arguments to the linker.

Answer 1

It turns out you can make the build verbose by changing the build.gradle file as follows:

    externalNativeBuild {
        cmake {
            arguments "-DCMAKE_VERBOSE_MAKEFILE=1"       
        }
    }

When using ndk-build instead of cmake, use this instead:

    externalNativeBuild {
        ndkBuild {
            arguments "V=1"
        }
    }

Answer 2

Regarding to https://developer.android.com/reference/tools/gradle-api/4.1/com/android/build/api/dsl/NdkBuild there is no possibility to pass arguments.
But you can pass an the folder for outputs, which generates .json files

    externalNativeBuild {
        ndkBuild {
            // Tells Gradle to put outputs from external native
            // builds in the path specified below.
            buildStagingDirectory "./outputs/ndk-build"
            path 'Android.mk'
        }
    }

So in my case in outputs/ndk-build/debug/json_generation_record.json the last "message" told me the error:

JSON generation completed with problem. Exception: Build command failed.
Error while executing process .... ndk-build.cmd ....
...
Android.mk:myLib-prebuilt: LOCAL_SRC_FILES points to a missing file 
Android NDK: Check that ... exists  or that its path is correct 
...prebuilt-library.mk:45: *** Android NDK: Aborting    .  Stop.\n"