[Scons-users] Scons none-deterministic behavior for incremental build

[Oscar Anson]

Hi,

Not sure if this could be related, but a similar issue happened to me where
I get a relink of a shared library without changing anything in the
project. It happened that I was setting the environment LIBS and LIBPATH
after calling the builder of the library.

El mar., 4 dic. 2018 20:55, Hua Yanghao <huayanghao at gmail.com> escribió:

> Dear Scons Experts,
> I recently hit on a very strange problem where scons incremental
> builds sometimes OK, sometimes the entire project is re-built.
>
> scons: 3.0.1
> python: 3.6.7
>
> --debug=explain gives below example trace:
> scons: rebuilding
> `build/configs/qemu_arm_vexpress/arm3/config/config.h' because
> AlwaysBuild() is specified
> __CONFIG build/configs/qemu_arm_vexpress/arm3/config/config.h
> scons: rebuilding
> `build/configs/qemu_arm_vexpress/arm3/firmware/arch/armv7/arch_init.o'
> because:
>            `firmware/arch/armv7/arch_init.c' is no longer a dependency
>            `firmware/arch/armv7/arch_init.c' is a new dependency
>
> It seems some how the C file itself is removed and re-added as the
> Object() dependency, and causes rebuild. However this is *NOT*
> *always* the case. Sometime the rebuild doesn't happen.
>
> I failed to create a minimal example that can show this issue so far,
> but in the production environment it is about 50% full-rebuild and 50%
> incremental re-build.
>
> Any thoughts or hints?
>
> Thanks,
> Yanghao
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