This is my first question in StackOverflow since I joined some weeks ago and I wish someone could shed some light to this issue that drives me nuts! I've already searched thru the web, but I cannot find a successful solution to this problem.
I'm having some trouble with debugging with Netbeans 7.1 on Mac OSX 10.5.8 (Leopard) using GNU GDB. My problem is that I can't easily debug my own static or dynamic libraries from a test application because the debugger doesn't stop at breakpoints set in the source code of that libraries. However I've noticed that I can "step into" the library functions and, once I'm in them, breakpoints in those functions do fire!
My testbench consists on 2 simple projects: "mylib" (a C static library) and "mylib-test" (a C application). 'mylib' simply contains a header and a c file that define the function:
int sum(int a, int b) {
return a+b;
}
On the other hand, the mylib-test source simply uses that function:
int main(int argc, char** argv) {
printf("Result=%d\n", sum(111, 222));
return (EXIT_SUCCESS);
}
Both projects compile and execute successfully. For your convenience, below I put down the output of compiling/linking both projects:
Output of compiling mylib:
gcc -c -g -MMD -MP -MF build/Debug/GNU-MacOSX/m.o.d -o build/Debug/GNU-MacOSX/m.o m.c
mkdir -p dist/Debug/GNU-MacOSX
rm -f dist/Debug/GNU-MacOSX/libmylib.a
ar -rv dist/Debug/GNU-MacOSX/libmylib.a build/Debug/GNU-MacOSX/m.o
ar: creating archive dist/Debug/GNU-MacOSX/libmylib.a
a - build/Debug/GNU-MacOSX/m.o
ranlib dist/Debug/GNU-MacOSX/libmylib.a
Output of compiling mylib-test:
gcc -c -g -I../mylib -MMD -MP -MF build/Debug/GNU-MacOSX/main.o.d -o build/Debug/GNU-MacOSX/main.o main.c
mkdir -p dist/Debug/GNU-MacOSX
gcc -o dist/Debug/GNU-MacOSX/mylib-test build/Debug/GNU-MacOSX/main.o ../mylib/dist/Debug/GNU-MacOSX/libmylib.a
By examining the Debugger Console, I've noticed that breakpoints placed in the library's source code are marked as "PENDING" when I load the application on the debugger (see line starting by 12^done, field addr):
11-break-insert -f "/Users/claudi/dev/mylib-test/main.c:16"
12-break-insert -f "/Users/claudi/dev/mylib/m.c:5"
7^done,line="7",file="main.c",fullname="/Users/claudi/dev/mylib-test/main.c",time={wallclock="0.00065",user="0.00032",system="0.00029",start="1345544547.505531",end="1345544547.506184"}
(gdb)
13-break-insert -t main
&"cd /Users/claudi/dev/mylib-test\n"
8^done
(gdb)
9^done,time={wallclock="0.00002",user="0.00002",system="0.00000",start="1345544547.530991",end="1345544547.531013"}
(gdb)
&"set environment DYLD_LIBRARY_PATH=../mylib/dist/Debug/GNU-MacOSX\n"
10^done
(gdb)
11^done,bkpt={number="1",type="breakpoint",disp="keep",enabled="y",addr="0x00001fb3",func="main",file="main.c",line="16",shlib="/Users/claudi/dev/mylib-test/dist/Debug/GNU-MacOSX/mylib-test",times="0"},time={wallclock="0.00058",user="0.00030",system="0.00029",start="1345544547.532421",end="1345544547.533003"}
(gdb)
12^done,bkpt={number="2",type="breakpoint",disp="keep",enabled="y",addr="<PENDING>",pending="/Users/claudi/dev/mylib/m.c:5",times="0"},time={wallclock="0.00040",user="0.00018",system="0.00022",start="1345544547.533140",end="1345544547.533542"}
(gdb)
13^done,bkpt={number="3",type="breakpoint",disp="del",enabled="y",addr="0x00001fb3",func="main",file="main.c",line="16",shlib="/Users/claudi/dev/mylib-test/dist/Debug/GNU-MacOSX/mylib-test",times="0"},time={wallclock="0.00017",user="0.00016",system="0.00001",start="1345544547.552190",end="1345544547.552362"}
It seems that GDB is not loading the symbols of the library, yet it is actually linked statically (I mean, there are no dynamic libraries to load)!!
However, if I step into function sum from the main() function, and then place the breakpoint, then it is successfully resolved:
21-break-insert -f "/Users/claudi/dev/mylib/m.c:5"
21^done,bkpt={number="4",type="breakpoint",disp="keep",enabled="y",addr="0x00001fea",func="sum",file="m.c",line="5",shlib="/Users/claudi/dev/mylib-test/dist/Debug/GNU-MacOSX/mylib-test",times="0"},time={wallclock="0.00099",user="0.00039",system="0.00060",start="1345544947.877096",end="1345544947.878088"}
I hope I've given enough information... Does anybody have an idea of what's going on? Thank you in advance!
Further info:
GCC version: 686-apple-darwin9-gcc-4.2.1 (GCC) 4.2.1 (Apple Inc. build 5577)
GDB version: GNU gdb 6.3.50-20050815 (Apple version gdb-967)
Netbeans version: 7.1 (Build 201112071828)
////////////// EDIT //////////////////////////////////////////////////
So far I thought the problem was GDB, but today I've noticed it is not true: I've been able to debug the application directly using GDB from the command line, i.e., I could set breakpoints to my sum function and the debugger successfully stopped at them without the need to step into the function. So, I'm sure I'm having some issue with how NetBeans starts/initializes GDB. I've also noticed that NetBeans is trying to get features from GDB without success. From the debugger console:
~"GNU gdb 6.3.50-20050815 (Apple version gdb-967) (Tue Jul 14 02:11:58 UTC 2009)\n"
~"Copyright 2004 Free Software Foundation, Inc.\n"
~"GDB is free software, covered by the GNU General Public License, and you are\nwelcome
to change it and/or distribute copies of it under certain conditions.\nType \"show
copying\" to see the conditions.\nThere is absolutely no warranty for GDB. Type \"show
warranty\" for details.\n"
~"This GDB was configured as \"i386-apple-darwin\"."
~"\n"
(gdb)
2-list-features
3-gdb-set print repeat 0
4-gdb-set backtrace limit 1024
5-gdb-set print elements 0
6-file-exec-and-symbols "/Users/claudi/dev/mylib-test/dist/Debug/GNU-MacOSX/mylib-test"
2^error,msg="Undefined MI command: list-features"
