gdb.info: Symbol Errors

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Errors reading symbol files

While reading a symbol file, GDB occasionally encounters problems, such
as symbol types it does not recognize, or known bugs in compiler
output.  By default, GDB does not notify you of such problems, since
they are relatively common and primarily of interest to people
debugging compilers.  If you are interested in seeing information about
ill-constructed symbol tables, you can either ask GDB to print only one
message about each such type of problem, no matter how many times the
problem occurs; or you can ask GDB to print more messages, to see how
many times the problems occur, with the `set complaints' command (*note
Optional warnings and messages: Messages/Warnings.).
   The messages currently printed, and their meanings, include:
`inner block not inside outer block in SYMBOL'
     The symbol information shows where symbol scopes begin and end
     (such as at the start of a function or a block of statements).
     This error indicates that an inner scope block is not fully
     contained in its outer scope blocks.
     GDB circumvents the problem by treating the inner block as if it
     had the same scope as the outer block.  In the error message,
     SYMBOL may be shown as "`(don't know)'" if the outer block is not a
     function.
`block at ADDRESS out of order'
     The symbol information for symbol scope blocks should occur in
     order of increasing addresses.  This error indicates that it does
     not do so.
     GDB does not circumvent this problem, and has trouble locating
     symbols in the source file whose symbols it is reading.  (You can
     often determine what source file is affected by specifying `set
     verbose on'.  *Note Optional warnings and messages:
     Messages/Warnings.)
`bad block start address patched'
     The symbol information for a symbol scope block has a start address
     smaller than the address of the preceding source line.  This is
     known to occur in the SunOS 4.1.1 (and earlier) C compiler.
     GDB circumvents the problem by treating the symbol scope block as
     starting on the previous source line.
`bad string table offset in symbol N'
     Symbol number N contains a pointer into the string table which is
     larger than the size of the string table.
     GDB circumvents the problem by considering the symbol to have the
     name `foo', which may cause other problems if many symbols end up
     with this name.
`unknown symbol type `0xNN''
     The symbol information contains new data types that GDB does not
     yet know how to read.  `0xNN' is the symbol type of the
     uncomprehended information, in hexadecimal.
     GDB circumvents the error by ignoring this symbol information.
     This usually allows you to debug your program, though certain
     symbols are not accessible.  If you encounter such a problem and
     feel like debugging it, you can debug `gdb' with itself, breakpoint
     on `complain', then go up to the function `read_dbx_symtab' and
     examine `*bufp' to see the symbol.
`stub type has NULL name'
     GDB could not find the full definition for a struct or class.
`const/volatile indicator missing (ok if using g++ v1.x), got...'
     The symbol information for a C++ member function is missing some
     information that recent versions of the compiler should have
     output for it.
`info mismatch between compiler and debugger'
     GDB could not parse a type specification output by the compiler.