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With that, the debug symbols are included in the resulting executable (-ggdb) and all compiler optimizations are disabled (-O0).
With the debug symbols in the resulting executable, you get an error message when starting gdb and running the executable. So you need to add this to your ~/.gdbinit file:
...
Beware, with that you are executing python code automatically. It is possible somebody does something bad to you.
You also may need to add the source directory to your source code path.
...
And now you should be ok to debug.
egumtow@lcls-dev3
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~/code/ipmiComm/iocs/ipmicomm-test-IOC/iocBoot/iocipmicomm-test-IOC>
...
gdb
...
../../bin/rhel6-x86_64/ipmicomm-test-IOC
[...]
(gdb)
...
b
...
init_fru_stringin_record
Breakpoint
...
1
...
at
...
0x447f25:
...
file
...
../devMch.c,
...
line
...
1509.
(gdb)
...
r
...
./st.cmd
Breakpoint
...
1,
...
init_fru_stringin_record
...
(pstringin=0x8ab520)
...
at
...
../devMch.c:1509
1509
...
...
MchRec
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recPvt
...
=
...
0;
...
/*
...
Info
...
stored
...
with
...
record
...
*/
Missing
...
separate
...
debuginfos,
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use:
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debuginfo-install
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glibc-2.12-1.212.el6_10.3.x86_64
...
ncurses-libs-5.7-4.20090207.el6.x86_64
...
readline-6.0-4.el6.x86_64
(gdb)
...
bt
#0
...
init_fru_stringin_record
...
(pstringin=0x8ab520)
...
at
...
../devMch.c:1509
#1
...
0x00000000004b4b79
...
in
...
init_record
...
(pcommon=0x8ab520,
...
pass=<value
...
optimized
...
out>)
...
at
...
../rec/stringinRecord.c:119
#2
...
0x00000000004fc2cd
...
in
...
doInitRecord1
...
()
...
at
...
../misc/iocInit.c:553
#3
...
iterateRecords
...
()
...
at
...
../misc/iocInit.c:485
#4
...
initDatabase
...
()
...
at
...
../misc/iocInit.c:561
#5
...
iocBuild_2
...
()
...
at
...
../misc/iocInit.c:163
#6
...
0x00000000004fc505
...
in
...
iocBuild
...
()
...
at
...
../misc/iocInit.c:202
#7
...
0x00000000004fc569
...
in
...
iocInit
...
()
...
at
...
../misc/iocInit.c:107
#8
...
0x0000000000500be9
...
in
...
iocInitCallFunc
...
(args=<value
...
optimized
...
out>)
...
at
...
../misc/miscIocRegister.c:25
#9
...
0x000000000053eee2
...
in
...
iocshBody
...
(pathname=<value
...
optimized
...
out>,
...
commandLine=0x0,
...
macros=0x0)
...
at
...
../iocsh/iocsh.cpp:925
#10
...
0x000000000043e9d0
...
in
...
main
...
(argc=2,
...
argv=0x7fffffffad58)
...
at
...
../ipmicomm-test-IOCMain.cpp:17
Note that you see some "value optimized out" in the backtrace. That is because those frames are inside libraries that we did not compile, but did link to. Whoever compiled those did so with optimization enabled. It is typical to have two versions of libraries, one of which is used for debugging like we want to do. By default the non-debugging libraries are linked in by overriding the -L options to gcc and/or setting the LD_LIBRARY_PATH environment variable. But I don't know where the live or if they exist.
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