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SubjectRe: Immortal CONFIG_DEBUG_INFO=y
On Sun, Nov 16, 2008 at 08:49:48AM +0100, Sam Ravnborg wrote:
> On Sun, Nov 16, 2008 at 10:42:01AM +0300, Alexey Dobriyan wrote:
> > As known to everybody doing fat builds, banning DEBUG_INFO=y is mandatory,
> > otherwise build is slower and takes much more disk space. And to not
> > accidently enable it, banning it in kconfig:
> >
> > @@ -475,7 +475,7 @@ config DEBUG_BUGVERBOSE
> >
> > config DEBUG_INFO
> > bool "Compile the kernel with debug info"
> > - depends on DEBUG_KERNEL
> > + depends on DEBUG_KERNEL && DISABLED
> > help
> > If you say Y here the resulting kernel image will include
> > debugging info resulting in a larger kernel image.
> >
> > This works pretty well -- allmodconfig generates config without DEBUG_INFO and
> > so on, defconfigs also regenerated without it, even if original one in arch/
> > has DEBUG_INFO enabled and so on. Trick also works for other options, like,
> > KALLSYMS_EXTRA_PASS.
> >
> > Except one case:
> >
> > make ARCH=sh magicpanelr2_defconfig
> >
> > DEBUG_INFO survives to .config and resulting build runs with -g.
>
> Because that defconfig does:
> CONFIG_SH_KGDB=y
>
> and SH_KGDB does:
> select DEBUG_INFO

Indeed, thank you for explanation!

> Instead of editing the Kconfig file you should use the KCONFIG_ALLCONFIG trick.

It's not reliable.

The very same select will select DEBUG_INFO as usual.


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