CODEWITHSUNDEEP
c++gdbopensuse
yvxiang
yvxiang

Reputation: 25

Couldn't make breakpoint in gdb

I use openSUSE as my OS,and gdb 7.5. I want to debug my programs with gdb, with breakpoints. But when I make a breakpoint, and then run my program, gdb informs me as follows :

Error in re-setting breakpoint 1: malformed linespec error: unexpected string, ".cpp"

Its same in all of my programs. Also, when run to the breakpoint ,the program doesnt' stop at all. Can any one tell me what's wrong?

I download the latest gdb and install it ,the former message is gone ,but when run gdb it tells me that :

warning: Could not load shared library symbols for linux-gate.so.1. Do you need "set solib-search-path" or "set sysroot"?

how to slove this problem?

Upvotes: 1

Views: 1857

Answers (2)

Dima Chubarov
Dima Chubarov

Reputation: 17179

There is a known bug in gdb 7.5 where the debugger fails to parse the linespec when the source file name starts with a decimal digit. See this message for details.

Try renaming the file and update gdb from your distribution repository. If the bug persists, file a bug with your distribution maintainers.

See a sample session from a bug report submitted to gdb bugzilla.

(gdb) b 3
Breakpoint 1 at 0x4004c3: file 2.c, line 3.
(gdb) r
Starting program: /home/teawater/tmp/a.out 
Error in re-setting breakpoint 1: malformed linespec error: unexpected string, ".c"
Error in re-setting breakpoint 1: malformed linespec error: unexpected string, ".c"
Error in re-setting breakpoint 1: malformed linespec error: unexpected string, ".c"
Error in re-setting breakpoint 1: malformed linespec error: unexpected string, ".c"

Upvotes: 2

Andreas Fester
Andreas Fester

Reputation: 36649

I use "b + linenumber"

This defines a breakpoint relative to the current line, see als Specifying a Location. With the code from your comment below, the following would work:

$ gdb ./main
(gdb) b +5
Breakpoint 1 at 0x40139c: file main.cpp, line 6.
(gdb) run
[New Thread 1528.0x1930]

Breakpoint 1, main () at main.cpp:5
5           while(scanf("%d%d",&a,&b)!=EOF)

Unless there is a good reason to specify relative line numbers, I suggest that you use absolute line numbers or function names:

(gdb) b main
Breakpoint 1 at 0x401395: file main.cpp, line 3.

(gdb) b main.cpp:6
Breakpoint 1 at 0x40139c: file main.cpp, line 6.

Upvotes: 1

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