[Bug other/78096] New: gcc-4.9.4 make bootstrap libgcc_s.so link problem

["edeveaud at pasteur dot fr" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78096

            Bug ID: 78096
           Summary: gcc-4.9.4 make bootstrap libgcc_s.so link problem
           Product: gcc
           Version: 4.9.4
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: other
          Assignee: unassigned at gcc dot gnu.org
          Reporter: edeveaud at pasteur dot fr
  Target Milestone: ---

Hello, 

while building gcc-4.9.4 on centos6 I have a strange link problem
some libraries are linked to the installed libgcc_s.so libraries, while other
are linked to libgcc_s.so system libraries

eg:
link to system libgcc_s.so
libstdc++.so
libvtv.so
libitm.so

link to installed libgcc_s.so
libasan.so
liblsan.so
libcilkrts.so 
libtsan.so
libubsan.so


here is a Dockerfile that reproduce the problem.
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
FROM centos:6
MAINTAINER Eric Deveaud <edeveaud@pasteur.fr>

RUN yum install -y gcc gcc-c++ wget

WORKDIR /src

#----  install internal gcc 
RUN mkdir -p gcc/4.9.4 && \
    cd gcc/4.9.4 && \
    wget -qO-  ftp://ftp.lip6.fr/pub/gcc/releases/gcc-4.9.4/gcc-4.9.4.tar.gz |
tar xz --strip-components 1 && \
    sh contrib/download_prerequisites 

RUN mkdir -p /tmp/build && \
    cd /tmp/build && \
    /src/gcc/4.9.4/configure --disable-multilib --enable-threads=posix
--enable-__cxa_atexit -enable-languages=c,c++ --prefix=/exe/gcc/4.9.4 && \
    make  bootstrap && \
    make install 

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

container was built using 

docker build   -f Dockerfile-gcc  -t  gcc . | tee log

(I can provide buil log

and then container run using 

docker run -i -t  gcc /bin/bash


following command emphasis the linking problem.

find /exe/gcc/4.9.4 -type l -name \*.so | xargs ldd | grep libgcc_s.so
        libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007f043971c000)
        libgcc_s.so.1 => /exe/gcc/4.9.4/lib/../lib64/libgcc_s.so.1
(0x00007f7ae4b97000)
        libgcc_s.so.1 => /exe/gcc/4.9.4/lib/../lib64/libgcc_s.so.1
(0x00007f4321ef7000)
        libgcc_s.so.1 => /exe/gcc/4.9.4/lib/../lib64/libgcc_s.so.1
(0x00007fd9918fe000)
        libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007f5ea3ba4000)
        libgcc_s.so.1 => /exe/gcc/4.9.4/lib/../lib64/libgcc_s.so.1
(0x00007fbaf49bc000)
        libgcc_s.so.1 => /exe/gcc/4.9.4/lib/../lib64/libgcc_s.so.1
(0x00007fd7f5423000)
        libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007f57bcfeb000)


did I missed something ?

best regards

Eric