[Buildroot] [Bug 11451] New: 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

            Bug ID: 11451
           Summary: Can't find libmpfr.so.4 when using external toolchain
                    on ubuntu 18.04/18.10
           Product: buildroot
           Version: unspecified
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: critical
          Priority: P5
         Component: Other
          Assignee: unassigned at buildroot.uclibc.org
          Reporter: lgnice at sina.com
                CC: buildroot at uclibc.org
  Target Milestone: ---

Created attachment 7836
  --> https://bugs.busybox.net/attachment.cgi?id=7836&action=edit
libzlib configure error

When I upgraded ubuntu from 16.04 to 18.04, output/build/libzlib-1.2.11 will
have a compilation error, because I used the toolchain provided by the bsp
vendor.

The reason is: ubuntu 18.04/18.10 removed
Libgmpv4-dev - Multiprecision arithmetic library developers tools (GCC 4.x
compatible)

Only reserved: libmpfr6 - multiple precision floating-point computation

However, I found that all toolchains provide libmpfr.so by themselves:

/opt/Vatics/vtcs_toolchain/arm-eabi-uclibc/usr/lib/libmpfr.so
/opt/ralink/arm-buildroot-gcc463-for-ibox/usr/lib/libmpfr.so
/opt/ralink/buildroot-gcc463/usr/lib/libmpfr.so
/opt/mtk_mipsel_gcc-4.6.3_uclibc-0.9.33/usr/lib/libmpfr.so
/opt/GrainMedia/gm813x/toolchain_gnueabi-4.4.0_ARMv5TE/usr/lib/libmpfr.so
/opt/mipsel-24kec-linux-uclibc-4.9-2017.07/usr/lib/libmpfr.so
/opt/960A/buildroot-gcc463/usr/lib/libmpfr.so

 Just set the environment variable LD_LIBRARY_PATH to solve it.

Export
LD_LIBRARY_PATH=/opt/mipsel-24kec-linux-uclibc-4.9-2017.07/usr/lib:$LD_LIBRARY_PATH


but, once LD_LIBRARY_PATH is set, an error will be reported in buildroot:

You seem to have the current working directory in your
LD_LIBRARY_PATH environment variable. This doesn't work.
Make: *** [support/dependencies/dependencies.mk:25: core-dependencies] Error 1


How to solve it?

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