Re: [android-building] How to do Incremental build with updated compiler flags

['Dan Willemsen' via Android Building]

Any changes in .mk / .bp files should be producing correct incremental
builds -- in general since the ninja migration in Android N, though there
have been some bug fixes over the years since for some specific use cases.
Bug reports would be useful for any cases that you can reproduce on AOSP.

change C/C++ compiler flags in the build configuration files like .json
>

I'm unaware of any places where we load compiler flags from json files. If
you've made your own changes to the build system or compiler, that may need
more changes in the build system to produce correct incremental builds
(marking any additional files read as dependencies to wherever they're
read).

One of the special cases is that we don't actually depend on the clang
compiler itself for incremental builds, so if you update it in place, that
may not trigger rebuilds. Our compiler updates are in version-specific
paths, and the path change will trigger a command line change, and thus
proper incremental builds.

- Dan

On Thu, Aug 3, 2023 at 9:06 AM Vijay Ede  wrote:

> Hi,
> I want to check if we have an option to do incremental build after we
> change C/C++ compiler flags in the build configuration files like .json,
> .mk or .bp.
>
> Currently i am seeing if we update the compiler flags in the config file
> and do incremental build it is not taking the upadated flags. we have to
> delete the out/ folder and run full build again for updated flags to affect
> and this takes longer build times.
>
> The context i am looking for this is when we do toolchain version
> migration we might have some compiler related errors which might need
> update in compiler flags. So instead of doing clean build, i am looking for
> a way that rest of the build from the point of error continues with new
> flags.
>
> Thanks
> Vijay
>
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[android-building] How to do Incremental build with updated compiler flags

[Vijay Ede]

Hi,
I want to check if we have an option to do incremental build after we 
change C/C++ compiler flags in the build configuration files like .json, 
.mk or .bp.

Currently i am seeing if we update the compiler flags in the config file 
and do incremental build it is not taking the upadated flags. we have to 
delete the out/ folder and run full build again for updated flags to affect 
and this takes longer build times.

The context i am looking for this is when we do toolchain version migration 
we might have some compiler related errors which might need update in 
compiler flags. So instead of doing clean build, i am looking for a way 
that rest of the build from the point of error continues with new flags. 

Thanks
Vijay

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