[Bug build/27762] New: configure does not honor --with-mpfr=

["Mario.Klebsch@ime-actia.de" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=27762

            Bug ID: 27762
           Summary: configure does not honor --with-mpfr=
           Product: gdb
           Version: 10.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: build
          Assignee: unassigned at sourceware dot org
          Reporter: Mario.Klebsch@ime-actia.de
  Target Milestone: ---

I built mpc and libmpr as static libraries and installed them into a temprary
location.

I passed --with-mpfr=/... and  --with-mpc=/... to configure.

I expected the build process to pick up the static libraries provided at the
given locations.

But the resulting binary uses the shared libraries insalled in /lib64. 

gdb/Makefile was written with this line:

LIBMPFR = -lmpfr -lgmp

I configured and build gcc with the same options, and gcc uses the static
libraries. In the gcc build directory gcc/Makefile contains the following line:

GMPLIBS = -L/.../lib -L/.../lib -L/.../lib -lmpc -lmpfr -lgmp

The difference is, that gcc's configure added -L options with the path of the
static libraries.

The config.log does contain a setting with -L options:
gmplibs='-L/.../lib -L/.../lib -L/.../lib -lmpc -lmpfr -lgmp'

but this setting is not used when building gdb. :-(

I just found, that there also is a config.log in the gdb subdirectory. I see,
that  '--with-gmp=/...' '--with-mpfr=/...' were passed tot he sub-configure.

But I see, that this path is not used:

configure:10086: checking whether to use MPFR
configure:10088: result: /...
configure:10521: checking for libmpfr
configure:10541: gcc -o conftest -g -O2    conftest.c -ltinfow -lncursesw -lm
-ldl  -lmpfr -lgmp >&5
configure:10541: $? = 0
configure:10551: result: yes
configure:10558: checking how to link with libmpfr
configure:10560: result: -lmpfr -lgmp

It just detects the system-supplied mpfr and don't use the one, that I selected
on configures command line. :-(

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