History
The first version of DWARF proved to use excessive amounts of storage, and an incompatible successor, DWARF-2, superseded it and added various encoding schemes to reduce data size. DWARF was not immediately successful; for instance, when Sun Microsystems adopted ELF as part of their move to Solaris, they opted to continue using stabs, in an embedding known as "stabs-in-elf". Linux followed suit, and DWARF-2 did not become the default until the late 1990s.
The DWARF Workgroup of the Free Standards Group released DWARF version 3 in January 2006, adding (among other things) support for C++ namespaces, Fortran 90 allocatable data and additional compiler optimization techniques.
Version 4 of DWARF, which offers "improved data compression, better description of optimized code, and support for new language features in C++", was published in 2010.
Read more about this topic: DWARF
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