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POGDB: error setting break point in template class functions in header files
 

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    <p>I have used two different versions of GDB, both give problems in the following code:</p> <p>Trimmed down code in <code>MyFile.h</code>:</p> <pre><code>template&lt;class T&gt; struct ABC: PQR&lt;T&gt; { void flow(PP pp) { const QX qx = XYZ&lt;Z&gt;::foo(pp); // Trying to set a breakpoint here, line no. 2533 ASSERTp(qx &gt;= last_qx()); } } </code></pre> <p>GDB 7.1:</p> <pre><code>Reading symbols from /path_to_exec/exec...done. (gdb) break MyFile.h:2533 Note: breakpoint 1 also set at pc 0x121. Note: breakpoint 1 also set at pc 0x121. Note: breakpoint 1 also set at pc 0x121. Note: breakpoint 1 also set at pc 0x156. Note: breakpoint 1 also set at pc 0x156. Note: breakpoint 1 also set at pc 0x121. Note: breakpoint 1 also set at pc 0x121. Note: breakpoint 1 also set at pc 0x121. Note: breakpoint 1 also set at pc 0x121. Note: breakpoint 1 also set at pc 0x121. Note: breakpoint 1 also set at pc 0x121. Note: breakpoint 1 also set at pc 0x156. Note: breakpoint 1 also set at pc 0x156. Note: breakpoint 1 also set at pc 0x121. Breakpoint 1 at 0x44e5c4: file PacketEngine.h, line 2533. (23 locations) (gdb) run Starting program: /path_to_exec/exec -options Warning: Cannot insert breakpoint 1. Error accessing memory address 0x121: Input/output error. Cannot insert breakpoint 1. Error accessing memory address 0x156: Input/output error. </code></pre> <p><strong>Why is it trying to set 23 breakpoints for one? And further down, it is giving error on <code>run</code></strong></p> <p>GDB 6.3:</p> <pre><code> This GDB was configured as "x86_64-redhat-linux-gnu"...Using host libthread_db library "/lib64/tls/libthread_db.so.1". (gdb) break MyFile.h:2533 No line 2533 in file "MyFile.h". </code></pre> <p><strong>At start of the program, it doesn't even accept the breakpoint</strong> If I break in function ASSERTp, it breaks. Then. if I go "UP", and type break, it successfully inserts breakpoint (<code>break MyFile.h:2533</code>). [thus somehow it finds the file/line after the program actually runs]. <em>However</em>, despite the breakpoint being set, on rerunning the program it does not stop at line 2533 but 2534 only (breakpoint in function ASSERTp).</p> <p>My questions:</p> <p>1) Can someone please help me solve this?</p> <p>2) I have often had problems with template code and GDB. Is there any good &amp; free C++ debugger for templates?</p> <p>3) <em>Not really important, but a side question if it matters: Which version is preferable? The 7.1 seems to be more buggy, but I remember on some runs, it gives less problems.</em></p> <hr> <p>System info:</p> <pre><code>uname -a Linux ... 2.6.9-67.ELsmp #1 SMP Fri Nov 16 12:49:06 EST 2007 x86_64 x86_64 x86_64 GNU/Linux file /usr/bin/gdb #### GDB 6.3 /usr/bin/gdb: ELF 64-bit LSB executable, AMD x86-64, version 1 (SYSV), for GNU/Linux 2.4.0, dynamically linked (uses shared libs), stripped file ~/local/bin/gdb #### GDB 7.1 /home/user/local/bin/gdb: ELF 64-bit LSB executable, AMD x86-64, version 1 (SYSV), for GNU/Linux 2.4.0, dynamically linked (uses shared libs), not stripped file /path_to_exec/exec /path_to_exec/exec: ELF 64-bit LSB executable, AMD x86-64, version 1 (SYSV), for GNU/Linux 2.4.0, dynamically linked (uses shared libs), not stripped </code></pre>
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    1. COThe code base is large and heavily templated, so reproduction of the bug might be difficult :(. Hence any tips to narrow down the problem are welcome.
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