Re: Unwanted compilation parameters

[David Turner]

The -g parameter is intended, and doesn't impact your final binaries, i.e. it doesn't enlarge the size of the final binaries.

In a nutshell:

- intermediate libraries that are placed under obj/local/<abi>/ are built with -g to contain debug symbols, even for optimized code.

- the final libraries that are put under lib/<abi>/, and which end up in your .apk, are stripped from any debug symbols.

The point of the debug symbols under obj/local/<abi>/ is that it makes tools like ndk-stack useful when you get a crash in your optimized code. You can use ndk-stack to use the debug information under obj/local/<abi>/ to know exactly where the problem happened.

There is no impact on the size of the final stripped binaries, with our without -g, so don't worry about it. And there is no way to disable this right now.

Second, yes, gcc will only take the last one, to as long as it ends with -mfpu=neon, you're good. You would probably won't be able to compile your sources otherwise.

On Fri, Nov 9, 2012 at 4:33 PM, Jérôme Baril <jerome...@gmail.com> wrote:

Hello,

I try to compile tiny and optimized code using the lastest NDK.

I use Neon instructions thus, the Android.mk file contains : LOCAL_ARM_NEON := true.

Moreover, I don't need to debug my code (i.e. no debug symbols needed), so the Application.mk file contains : APP_OPTIM := release.

Then, when I execute 'ndk-build -n' to see the compile commands, I found some misterious g++ options : 

• -g : to generate debug symbols
• -march=armv7-a -mfloat-abi=softfp -mfpu=vfp [..] -mfpu=neon : 2 fpu options, AFAIK only the last one is needed in my case, but gcc maybe only takes the last one ?
  

However, even if the fpu options are good (can you confirm ?), is there a way to drop the '-g' parameter. Indeed, this option enlarges the size of the lib with useless symbols.

Thanks a lot !

Jérôme

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