[Bug dynamic-link/14849] New: Add DF_1_DEEPBIND

["hjl.tools at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=14849

             Bug #: 14849
           Summary: Add DF_1_DEEPBIND
           Product: glibc
           Version: 2.17
            Status: NEW
          Severity: normal
          Priority: P2
         Component: dynamic-link
        AssignedTo: unassigned@sourceware.org
        ReportedBy: hjl.tools@gmail.com
    Classification: Unclassified


Created attachment 6740
  --> http://sourceware.org/bugzilla/attachment.cgi?id=6740
A testcase

>From a Linux user:

yes, i have a 3-rd party application (simulator) which uses an old boost-1.48
and i have a dlopened plugin for this simulator which uses new boost-1.51.
i'd like to avoid mixing incompatible boost symbols.

> Can you compile/link plugin against boost-1.48?

no, i'm using 1.50+ specific features/fixes not present in 1.48.

This issue can be solved with RTLD_DEEPBIND:

[hjl@gnu-tools-1 mixed-syms]$ make
gcc -shared -o libBOOST.so.0 -fPIC BOOST0.c
gcc -o exe exe.c libBOOST.so.0  -ldl -Wl,-R,.
gcc -shared -o libBOOST.so.1 -fPIC BOOST1.c
gcc -shared -o plugin.so -fPIC plugin.c libBOOST.so.1
./exe
bar()
new foo()
old foo()
[hjl@gnu-tools-1 mixed-syms]$ 

We can add DF_1_DEEPBIND, implement "ld -z deepbind" and map
it to TLD_DEEPBIND.

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