How to see the actual gcc options when building Android from source?

I'm trying to debug my android source build environment (Android.mk files). 开发者_开发问答 By default the make system does not show the gcc command line during the build process. What is the best way to enable this?

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Probably too late for the asker, but for anyone else who comes along. From the ndk documentation @ https://docs.google.com/document/d/1jXxLV866aY9QXWS_9UwLSJjX1I6d1XfBhk1IeEyRgYE/edit?pli=1

ndk-build NDK_DEBUG=1 --> generate debuggable native code.

ndk-build V=1 --> launch build, displaying build commands.

ndk-build -B --> force a complete rebuild.

ndk-build -B V=1 --> force a complete rebuild and display build commands.

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The showcommands make target will display the gcc/g++ command line:

$ make showcommands

More info and other Android.mk build nuggets here: http://elinux.org/Android_Build_System

If you are building with mm:

$ mm showcommands

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I found a very detailed documentation in this link: http://hashspeaks.wordpress.com/2010/01/27/android-mk-documentation/

so you should be able to add -v -Wall to LOCAL_CPPFLAGS