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SubjectToolchain-dependent config options
Hi Masahiro,

If I copy a config with CONFIG_GCC_PLUGINS to another system which
doesn't have the gcc-plugin-devel package, it gets silently disabled by
"make olddefconfig".

I've seen multiple cases lately where this is causing confusion. I
suspect the problem is getting worse with recent added support for a
variety of toolchains and toolchain-dependent features.

Would it be possible to have an error (or at least a warning) in this
case?

For example, a "depends-error" which triggers an error if its failure
would disable a feature?

--
Josh

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