Glibc

lastmod 2021-11-19created 2015-01-304 edits

The GNU C Library, commonly known as glibc, is the GNU Project's implementation of the C standard library. Despite its name, it now also supports C++. It was started in the early 1990s by the Free Software Foundation (FSF) for its GNU operating system.

Distributed under the GNU Lesser General Public License, glibc is free software.

Debugging

Use the LD_DEBUG environment variable. The HELP message is as follows:

$ LD_DEBUG=help cat
Valid options for the LD_DEBUG environment variable are:

  libs        display library search paths
  reloc       display relocation processing
  files       display progress for input file
  symbols     display symbol table processing
  bindings    display information about symbol binding
  versions    display version dependencies
  scopes      display scope information
  all         all previous options combined
  statistics  display relocation statistics
  unused      determined unused DSOs
  help        display this help message and exit

To direct the debugging output into a file instead of standard output
a filename can be specified using the LD_DEBUG_OUTPUT environment variable.