[Buildroot] [Bug 11451] Can't find libmpfr.so.4 when using external toolchain on ubuntu 18.04/18.10

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=11451

Thomas Petazzoni <thomas.petazzoni at free-electrons.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |WONTFIX
             Status|NEW                         |RESOLVED

--- Comment #2 from Thomas Petazzoni <thomas.petazzoni at free-electrons.com> ---
If the programs in your external toolchain use libmpfr.so, but it is not
provided by the external toolchain, then the external toolchain is broken.

Your patch causes two problems:

 (1) libmpfr.so is not guaranteed to be installed $(HOST_DIR)/lib. Buildroot
only builds/installs host-mpfr if needed, and a typical configuration that uses
an external toolchain will not build/install host-mpfr.

 (2) Passing LD_LIBRARY_PATH pointing to some host libraries will very likely
confuse the cross-compilation of some packages. We tried a while ago to use
LD_LIBRARY_PATH, and it was a total failure.

So, here, you really need to fix the external toolchain itself.

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