How do you find what version of libstdc library is installed on your linux machine

Question

I found the following command  strings  usr lib libstdc   so 6   grep GLIBC from here  It seems to work but this is an ad-hoc heuristic method   Is there a specific command that can be used to query the library version of C    Or is the method I found the accepted method

User · Answer

To find which library is being used you could run

 $ /sbin/ldconfig -p | grep stdc++
    libstdc++.so.6 (libc6) => /usr/lib/libstdc++.so.6

The list of compatible versions for libstdc++ version 3.4.0 and above is provided by

 $ strings /usr/lib/libstdc++.so.6 | grep LIBCXX
 GLIBCXX_3.4
 GLIBCXX_3.4.1
 GLIBCXX_3.4.2
 ...

For earlier versions the symbol GLIBCPP is defined.

The date stamp of the library is defined in a macro __GLIBCXX__ or __GLIBCPP__ depending on the version:

// libdatestamp.cxx
#include <cstdio>

int main(int argc, char* argv[]){
#ifdef __GLIBCPP__
    std::printf("GLIBCPP: %d\n",__GLIBCPP__);
#endif
#ifdef __GLIBCXX__
    std::printf("GLIBCXX: %d\n",__GLIBCXX__);
#endif
   return 0;
}

$ g++ libdatestamp.cxx -o libdatestamp
$ ./libdatestamp
GLIBCXX: 20101208

The table of datestamps of libstdc++ versions is listed in the documentation:

User · Answer

What exactly do you want to know   The shared library soname  That s part of the filename  libstdc   so 6  or shown by readelf -d  usr lib64 libstdc   so 6   grep soname   The minor revision number   You should be able to get that by simply checking what the symlink points to     ls -l   usr lib libstdc   so 6 lrwxrwxrwx  1 root root 19 Mar 23 09 43  usr lib libstdc   so 6 - gt  libstdc   so 6 0 16   That tells you it s 6 0 16  which is the 16th revision of the libstdc   so 6 version  which corresponds to the GLIBCXX 3 4 16 symbol versions   Or do you mean the release it comes from   It s part of GCC so it s the same version as GCC  so unless you ve screwed up your system by installing unmatched versions of g   and libstdc   so you can get that from     g   -dumpversion 4 6 3   Or  on most distros  you can just ask the package manager  On my Fedora host that s     rpm -q libstdc   libstdc  -4 6 3-2 fc16 x86 64 libstdc  -4 6 3-2 fc16 i686   As other answers have said  you can map releases to library versions by checking the ABI docs

User · Answer

You could use g   --version in combination with the GCC ABI docs to find out

User · Answer

The mechanism I tend to use is a combination of readelf -V to dump the  gnu version information from libstdc    and then a lookup table that matches the largest GLIBCXX  value extracted   readelf -sV  usr lib libstdc   so 6   sed -n  s     GLIBCXX   p    sort -u -V   tail -1   if your version of sort is too old to have the -V option  which sorts by version number  then you can use   tr           sort -nu -t     -k 1 -k 2 -k 3 -k 4   tr           instead of the sort -u -V  to sort by up to 4 version digits   In general  matching the ABI version should be good enough   If you re trying to track down the libstdc   so  lt VERSION gt   though  you can use a little bash like   file  usr lib libstdc   so 6 while   -h  file    do file   ls -l  file   sed -n  s   - gt    p    done echo   file   so     so for my system this yielded 6 0 10   If  however  you re trying to get a binary that was compiled on systemX to work on systemY  then these sorts of things will only get you so far  In those cases  carrying along a copy of the libstdc   so that was used for the application  and then having a run script that does an   export LD LIBRARY PATH  lt directory of stashed libstdc   so gt  exec application bin        generally works around the issue of the  so that is on the box being incompatible with the version from the application  For more extreme differences in environment  I tend to just add all the dependent libraries until the application works properly  This is the linux equivalent of working around what  for windows  would be considered dll hell

[c++] How do you find what version of libstdc++ library is installed on your linux machine?

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