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128 lines
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<title>Symbol Errors - Debugging with GDB</title>
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<a name="Symbol-Errors"></a>
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Next: <a rel="next" accesskey="n" href="Data-Files.html#Data-Files">Data Files</a>,
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<h3 class="section">18.6 Errors Reading Symbol Files</h3>
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<p>While reading a symbol file, <span class="sc">gdb</span> occasionally encounters problems,
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such as symbol types it does not recognize, or known bugs in compiler
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output. By default, <span class="sc">gdb</span> does not notify you of such problems, since
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they are relatively common and primarily of interest to people
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debugging compilers. If you are interested in seeing information
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about ill-constructed symbol tables, you can either ask <span class="sc">gdb</span> to print
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only one message about each such type of problem, no matter how many
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times the problem occurs; or you can ask <span class="sc">gdb</span> to print more messages,
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to see how many times the problems occur, with the <code>set
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complaints</code> command (see <a href="Messages_002fWarnings.html#Messages_002fWarnings">Optional Warnings and Messages</a>).
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<p>The messages currently printed, and their meanings, include:
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<dl>
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<dt><code>inner block not inside outer block in </code><var>symbol</var><dd>
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The symbol information shows where symbol scopes begin and end
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(such as at the start of a function or a block of statements). This
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error indicates that an inner scope block is not fully contained
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in its outer scope blocks.
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<p><span class="sc">gdb</span> circumvents the problem by treating the inner block as if it had
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the same scope as the outer block. In the error message, <var>symbol</var>
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may be shown as “<code>(don't know)</code>” if the outer block is not a
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function.
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<br><dt><code>block at </code><var>address</var><code> out of order</code><dd>
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The symbol information for symbol scope blocks should occur in
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order of increasing addresses. This error indicates that it does not
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do so.
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<p><span class="sc">gdb</span> does not circumvent this problem, and has trouble
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locating symbols in the source file whose symbols it is reading. (You
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can often determine what source file is affected by specifying
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<code>set verbose on</code>. See <a href="Messages_002fWarnings.html#Messages_002fWarnings">Optional Warnings and Messages</a>.)
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<br><dt><code>bad block start address patched</code><dd>
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The symbol information for a symbol scope block has a start address
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smaller than the address of the preceding source line. This is known
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to occur in the SunOS 4.1.1 (and earlier) C compiler.
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<p><span class="sc">gdb</span> circumvents the problem by treating the symbol scope block as
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starting on the previous source line.
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<br><dt><code>bad string table offset in symbol </code><var>n</var><dd>
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<a name="index-foo-1295"></a>Symbol number <var>n</var> contains a pointer into the string table which is
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larger than the size of the string table.
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<p><span class="sc">gdb</span> circumvents the problem by considering the symbol to have the
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name <code>foo</code>, which may cause other problems if many symbols end up
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with this name.
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<br><dt><code>unknown symbol type 0x</code><var>nn</var><dd>
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The symbol information contains new data types that <span class="sc">gdb</span> does
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not yet know how to read. <code>0x</code><var>nn</var> is the symbol type of the
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uncomprehended information, in hexadecimal.
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<p><span class="sc">gdb</span> circumvents the error by ignoring this symbol information.
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This usually allows you to debug your program, though certain symbols
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are not accessible. If you encounter such a problem and feel like
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debugging it, you can debug <code>gdb</code> with itself, breakpoint
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on <code>complain</code>, then go up to the function <code>read_dbx_symtab</code>
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and examine <code>*bufp</code> to see the symbol.
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<br><dt><code>stub type has NULL name</code><dd>
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<span class="sc">gdb</span> could not find the full definition for a struct or class.
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<br><dt><code>const/volatile indicator missing (ok if using g++ v1.x), got...</code><dd>The symbol information for a C<tt>++</tt> member function is missing some
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information that recent versions of the compiler should have output for
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it.
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<br><dt><code>info mismatch between compiler and debugger</code><dd>
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<span class="sc">gdb</span> could not parse a type specification output by the compiler.
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</dl>
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