[Buildroot] [Bug 6452] New: eglibc from Linaro 2013.07 not copied to target correctly

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=6452

           Summary: eglibc from Linaro 2013.07 not copied to target
                    correctly
           Product: buildroot
           Version: 2013.05
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: major
          Priority: P5
         Component: Other
        AssignedTo: unassigned at buildroot.uclibc.org
        ReportedBy: henry at echelon.com
                CC: buildroot at uclibc.org
   Estimated Hours: 0.0


Created attachment 5042
  --> https://bugs.busybox.net/attachment.cgi?id=5042
Preserve toolchain sysroot lib's directory structure on target

When building buildroot with Linaro 2013.07 (configured as external or custom
tool), the target would fail to come up, with error:

/sbin/init: error while loading shared libraries: libc.so.6: cannot open shared
object file: No such file or directory

The reason is that starting with Linaro 2013.07, they switched to eglibc-2.17
with multi-arch support. Arch-specific libraries, including libc.so.6, are
expected to be in /lib/arm-linux-gnueabihf/ instead of just /lib. However,
copy_toolchain_lib_root() in helper.mk would end up copying them to /lib rather
than arch-specific directories.

Attached is my own patch to preserve the toolchain sysroot's lib directory
structure, except for SUPPORT_LIB_DIR which are still copied directly under
DESTDIR.

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