[Bug other/78097] New: gcc-6.2.0 inconsistent libgcc_s.so link

[edeveaud at pasteur dot fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78097

            Bug ID: 78097
           Summary: gcc-6.2.0 inconsistent libgcc_s.so link
           Product: gcc
           Version: 6.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: other
          Assignee: unassigned at gcc dot gnu.org
          Reporter: edeveaud at pasteur dot fr
  Target Milestone: ---

Hello, 

building gcc-6.2.0 on centos6 lead on inconsistent link to libgcc_s.so

some libraries are linked to the installed  libraries, while other are linked
to libgcc_s.so system libraries


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

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

WORKDIR /src

#----  install internal gcc 
RUN mkdir -p gcc/6.2.0 && \
    cd gcc/6.2.0 && \
    wget -qO-  ftp://ftp.lip6.fr/pub/gcc/releases/gcc-6.2.0/gcc-6.2.0.tar.gz |
tar xz --strip-components 1 && \
    sh contrib/download_prerequisites

RUN mkdir -p /tmp/build && \
    cd /tmp/build && \
    /src/gcc/6.2.0/configure --disable-multilib --enable-threads=posix
--enable-__cxa_atexit -enable-languages=c,c++ --prefix=/exe/gcc/6.2.0 && \
    MAKEFLAGS="-j $(grep -c ^processor /proc/cpuinfo)" make  bootstrap && \
    make install

# run produced docker using 
# docker run -i -t  gcc /bin/bash
# then
# find /exe/gcc/4.9.4 -type l -name \*.so | xargs ldd | grep libgcc_s.so

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

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.

[root@5ec47cdc07e6 src]# find /exe/gcc/6.2.0/ -type l -name \*.so | xargs ldd |
grep libgcc_s.so
        libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007ff1dde2e000)
        libgcc_s.so.1 => /exe/gcc/6.2.0/lib/../lib64/libgcc_s.so.1
(0x00007f1be06c7000)
        libgcc_s.so.1 => /exe/gcc/6.2.0/lib/../lib64/libgcc_s.so.1
(0x00007f6490629000)
        libgcc_s.so.1 => /exe/gcc/6.2.0/lib/../lib64/libgcc_s.so.1
(0x00007f7afcaf3000)
        libgcc_s.so.1 => /exe/gcc/6.2.0/lib/../lib64/libgcc_s.so.1
(0x00007febfaf18000)
        libgcc_s.so.1 => /exe/gcc/6.2.0/lib/../lib64/libgcc_s.so.1
(0x00007fbe2165c000)
        libgcc_s.so.1 => /exe/gcc/6.2.0/lib/../lib64/libgcc_s.so.1
(0x00007f18d26f8000)
        libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007f2390256000)
        libgcc_s.so.1 => /exe/gcc/6.2.0/lib/../lib64/libgcc_s.so.1
(0x00007f9755e8a000)



/exe/gcc/6.2.0/lib64/libstdc++.so
/exe/gcc/6.2.0/lib64/libitm.so
 links to /lib64/libgcc_s.so.1

/exe/gcc/6.2.0/lib64/libasan.so
/exe/gcc/6.2.0/lib64/liblsan.so
/exe/gcc/6.2.0/lib64/libcilkrts.so
/exe/gcc/6.2.0/lib64/libtsan.so
/exe/gcc/6.2.0/lib64/libubsan.so
/exe/gcc/6.2.0/lib64/libcc1.so
/exe/gcc/6.2.0/lib/gcc/x86_64-pc-linux-gnu/6.2.0/plugin/libcc1plugin.so
links to /exe/gcc/6.2.0/lib/../lib64/libgcc_s.so.1 

NB see also: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78096
@Markus I hope that gcc-6.0.2 is still maintained  ;-)

best regards

Eric