[poky] question re gcc-runtime vs libgcc

[Richard Purdie]

On Fri, 2010-12-31 at 21:51 +1100, Angus Lees wrote:
> Sorry if the answer is obvious, but I'm trying to put together some
> sdk packages and I can't see how gcc-runtime is supposed to build.
> 
> I'd like to have a static libgcc.a to isolate the sdk from whatever
> libgcc.so the platform ships.  I've modified the gcc-cross{,sdk}
> recipes appropriately and this part all seems to build as expected.
> gcc-runtime however fails to build because libgcc doesn't get pulled
> from its gcc-build-internal-* hiding place until do_install() - way
> too late to be available during the build of the actual gcc-runtime
> libraries.  I don't see how the situation would be any different with
> a shared libgcc.so.
> 
> Can someone walk me through how this part of gcc-runtime is meant to work?
> 
> 
> Also: I think in my case, I actually want to ship libgcc.a in
> gcc-cross{,sdk} itself since it needs to correspond with the compiler
> used (rather than the target sysroot as such) - but I admit I'm a bit
> lost in a maze of twisty cross targets, all almost alike.  Does this
> seem a reasonable thing to do?
> (This made sense to me in openembedded-land, but I haven't quite got
> my head around the gcc-runtime and gcc-crosssdk subtleties yet)

gcc-runtime is build process for bits that can be built standalone like
libstdc++. For pieces of gcc that can't be built separately like libgcc,
we take a stashed version of it from gcc-cross and only package it as
part of gcc-runtime.

It sounds like you want to change the bits that gcc-cross is stashing
for gcc-runtime to package.

Note that the gcc recipe versions need to match. We don't support mix
and patch of different versions in a given build/sdk.

Cheers,

Richard