Force CMake in verbose mode via Gradle and the And

I'm using Gradle and CMake to compile an Android NDK project from the command line. Previously, I was using Ant and ndk-build but I'm trying to migrate the project completely to Gradle and CMake.

In my build.gradle I have the following lines to invoke CMake:

externalNativeBuild {
    cmake {
        path "src/main/cpp/CMakeLists.txt"
    }
}

Now how can I force CMake to print all compiler calls to the console before it makes them? Specifically, I want to see just how CMake runs the compiler and linker.

I've already tried the following, all to no avail:

1) In my CMakeLists.txt I have put the following line:

set(CMAKE_VERBOSE_MAKEFILE on)

Didn't have any effect.

2) I have started the build like this:

./gradlew build --info

Gradle printed some stuff, but no compiler calls.

3) And like this:

./gradlew build --debug

Gradle printed lots of stuff, but no compiler calls.

So none of those three attempts did what I wanted which makes me wonder how can I see how CMake runs clang on my individual source files?

In Android Studio, gradle creates directory .externalNativeBuild under the module root, for each module that has NDK integration, via CMake or ndk-build.

For CMake, the gradle plugin is quite verbose. For each build variant it creates separate subdirectory, e.g. .externalNativeBuild/cmake/debug/x86 or .externalNativeBuild/cmake/release/armeabi-v7a, etc.

Each directory contains some useful files: cmake_build_command.txt describes the actual parameters passed to CMake; android_gradle_build.json shows what parameters the gradle plugin derived for your binaries; from build.ninja you can deduce the how these parameters were applied for each compilation or linkage step.

For ndk-build, the android_gradle_build.json file is also quite useful. ndkBuild_build_command.txt lists all parameters passed to ndk-build command, and ndkBuild_build_output.txt is the unabridged output of that command. You can easily add V=1 to the arguments, e.g.

externalNativeBuild {
  ndkBuild {
    cppFlags "-std=c++11"
    arguments "APP_STL=c++_static", "APP_OPTIM=release", "NDK_DEBUG=0", "V=1"
    abiFilters "armeabi-v7a"
  }
}

For CMake, the relevant argument is "-DCMAKE_VERBOSE_MAKEFILE:BOOL=ON" (see explanation and alternatives):

externalNativeBuild {
  cmake {
    cppFlags "-std=c++11"
    arguments "-DCMAKE_VERBOSE_MAKEFILE:BOOL=ON"
    abiFilters "armeabi-v7a"
  }
}

Without CMAKE_VERBOSE_MAKEFILE, the Gradle Console displays:

:app:externalNativeBuildDebug
Build native-lib armeabi-v7a
[1/2] Building CXX object CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o
[2/2] Linking CXX shared library ../../../../build/intermediates/cmake/debug/obj/armeabi-v7a/libnative-lib.so

With "-DCMAKE_VERBOSE_MAKEFILE:BOOL=ON", I get tons of output:

:app:externalNativeBuildDebug
Build native-lib armeabi-v7a

[1/2] /Users/alex/Library/Android/sdk/ndk-bundle/toolchains/llvm/prebuilt/darwin-x86_64/bin/clang++  --target=armv5te-none-linux-androideabi --gcc-toolchain=/Users/alex/Library/Android/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64 --sysroot=/Users/alex/Library/Android/sdk/ndk-bundle/platforms/android-14/arch-arm  -Dnative_lib_EXPORTS -isystem /Users/alex/Library/Android/sdk/ndk-bundle/sources/cxx-stl/gnu-libstdc++/4.9/include -isystem /Users/alex/Library/Android/sdk/ndk-bundle/sources/cxx-stl/gnu-libstdc++/4.9/libs/armeabi-v7a/include -isystem /Users/alex/Library/Android/sdk/ndk-bundle/sources/cxx-stl/gnu-libstdc++/4.9/include/backward -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -march=armv5te -mtune=xscale -msoft-float -fno-integrated-as -mthumb -Wa,--noexecstack -Wformat -Werror=format-security  -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -march=armv5te -mtune=xscale -msoft-float -fno-integrated-as -mthumb -Wa,--noexecstack -Wformat -Werror=format-security   -O0 -fno-limit-debug-info -O0 -fno-limit-debug-info  -fPIC -MD -MT CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o -MF CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o.d -o CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o -c /Users/alex/test/egl/app/src/main/cpp/native-lib.cpp
[2/2] : && /Users/alex/Library/Android/sdk/ndk-bundle/toolchains/llvm/prebuilt/darwin-x86_64/bin/clang++  --target=armv5te-none-linux-androideabi --gcc-toolchain=/Users/alex/Library/Android/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64 --sysroot=/Users/alex/Library/Android/sdk/ndk-bundle/platforms/android-14/arch-arm -fPIC -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -march=armv5te -mtune=xscale -msoft-float -fno-integrated-as -mthumb -Wa,--noexecstack -Wformat -Werror=format-security  -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -march=armv5te -mtune=xscale -msoft-float -fno-integrated-as -mthumb -Wa,--noexecstack -Wformat -Werror=format-security   -O0 -fno-limit-debug-info -O0 -fno-limit-debug-info  -Wl,--build-id -Wl,--warn-shared-textrel -Wl,--fatal-warnings -Wl,--no-undefined -Wl,-z,noexecstack -Qunused-arguments -Wl,-z,relro -Wl,-z,now -Wl,--build-id -Wl,--warn-shared-textrel -Wl,--fatal-warnings -Wl,--no-undefined -Wl,-z,noexecstack -Qunused-arguments -Wl,-z,relro -Wl,-z,now -shared -Wl,-soname,libnative-lib.so -o ../../../../build/intermediates/cmake/debug/obj/armeabi-v7a/libnative-lib.so CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o  -llog -lEGL -lGLESv2 -lm "/Users/alex/Library/Android/sdk/ndk-bundle/sources/cxx-stl/llvm-libc++/libs/armeabi-v7a/libc++_static.a" "-latomic" && :

The obvious file .externalNativeBuild/cmake/debug/armeabi-v7a/cmake_build_output.txt does not contain interesting information (unless you have problems with CMake configuration per se). Gradle does not write this output to file, but you can use command line redirection, see Where are Gradle logs?.