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For example, if you want to use /tmp/usr/lib/libsubs.sl and /tmp/usr/share/
lib/libsubs.sl, you can set GDB_SHLIB_ROOT' to /tmp. Now whenever GDB
encounters a library with the name /usr/lib/libsubs.sl and /usr/share/lib/
libsubs.sl, GDB looks at /tmp/usr/lib/libsubs.sl and /tmp/usr/share/
lib/libsubs.sl respectively.
12.3 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 (see“Optional warnings and messages” (page 284)).
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 in- creasing 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. See “Optional warnings and
messages” (page 284).)
bad block start address patched The symbol information for a symbol scope block
has a start address smaller than the address of
12.3 Errors reading symbol files 131