[Buildroot] [PATCH 1/1] toolchain: detect external glibc in symlinked /lib

[Yann E. MORIN]

Thomas, All,

On 2017-09-03 14:25 +0200, Thomas Petazzoni spake thusly:
> On Sun, 3 Sep 2017 22:22:24 +1000, Cam Hutchison wrote:
> > > > When building a toolchain with buildroot and a merged /usr, /lib is
> > > > a symlink to usr/lib. This is copied from the target to the staging
> > > > directory, and then to the sysroot, and the ultimate location of the
> > > > required files is in /usr/lib in the sysroot.  
[--SNIP--]
> In fact, I would first like to understand what you meant :)
> 
> Maybe what you meant is that: when the Buildroot toolchain is built
> with a merged /usr, lib is a symlink to usr/lib in the staging
> directory. Therefore, the resulting toolchain has such a symlink in its
> sysroot, and such a symlink is present in the staging directory when
> the toolchain is re-used as an external toolchain. The consequence is
> that the dynamic linker is not located in /lib, but in /usr/lib, even
> though it is accessible from /lib from a symlink.

This is exactly the problem that Cam is trying to solve here.

Cam created a toolchain with Buildroot and a merged /usr. He then
re-uses that as an external toolchain.

Cam, what about the fiollowing:

    toolchain: detect external glibc in merged /usr

    When using an external toolchain that was built with Buildroot and a
    merged /usr., the dynamic linker is actually in /usr/lib.

    But the check_glibc macro only limits the depth it is looking for
    the dynamic linker, anf misses it when it is in /usr/lib because it
    is too deep.

    WE could fix that in two ways: increase the depth in which we look
    for it, or follow symlinks. We choose the second solution.

    Signed-off-by: you
    Cc: Thomas P.
    Cc: Thomas DS.
    Cc: Me

What do you all think about this? ;-)

Regards,
Yann E. MORIN.

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