MPI debugging with GDB - No symbol "i" in current context

MPI debugging with GDB - No symbol "i" in current context

By : user2949217
Date : November 16 2020, 06:23 AM
around this issue I've finally solved this. The point is I had to examine the contents of the certain frame with up command, before trying to print the variable "i" up or changing its value.
Step-by-step solution
code :
#0  0x00007f63667e09a0 in __nanosleep_nocancel ()
at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f63667e0854 in __sleep (seconds=0)
at ../sysdeps/unix/sysv/linux/sleep.c:137
#2  0x00000000004009ec in main () at hello.c:20
#2  0x00000000004009ec in main () at hello.c:20
warning: Source file is more recent than executable.
20          sleep(30);
i = 0
world_size = 0
process_id = 0
processor_name = "\000\000\000\000\000\000\000\000 5\026gc\177\000\000\200\306Η\377\177\000\000p\306Η\377\177\000\000.N=\366\000\000\000\000\272\005@\000\000\000\000\000\377\377\377\377\000\000\000\000%0`\236\060\000\000\000\250\361rfc\177\000\000x\n\026gc\177\000\000\320\067`\236\060\000\000\000\377\377\377\177\376\377\377\377\001\000\000\000\000\000\000\000\335\n@\000\000\000\000\000\377\377\377\377\377\377\377\377\000\000\000\000\000\000\000"
name_len = 1718986550

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"no symbol XXX in current context" for specific classes in debugging of XCode ip* project

"no symbol XXX in current context" for specific classes in debugging of XCode ip* project

By : user2277113
Date : March 29 2020, 07:55 AM
I wish this helpful for you Its an Xcode bug/wierdness . Try deleting all your breakpoints and doing a full clean.
If that doesnt work make sure your compiler hasnt slipped away from LLVM.
No symbol "color" in current context. GDB

No symbol "color" in current context. GDB

By : dominic10
Date : March 29 2020, 07:55 AM
Does that help You need to make sure you're passing the -g flag to gcc when you compile your code. You should also pass -O0 to ensure that the compiler isn't optimizing your variable away.
Debugging PHP core files - No symbol "executor_globals" in current context

Debugging PHP core files - No symbol "executor_globals" in current context

By : user2794264
Date : March 29 2020, 07:55 AM
seems to work fine I ended up solving this by compiling PHP against a non-threaded Apache, effectively disabling thread safety in the PHP module which is what I wanted anyway.
More specifically, the apxs2 binary I was specifying in the configure args was from the Ubuntu apache2-threaded-dev package, while the Apache running on the server was prefork, not threaded. So I just had to install the apache2-prefork-dev package instead and recompile and I was good to go.
GDB reports "no symbol in current context" upon array initialization

GDB reports "no symbol in current context" upon array initialization

By : abdulaziz
Date : March 29 2020, 07:55 AM
wish help you to fix your issue VLAs do not currently work in gdb. There's a bug open about it and an ongoing project to fix it: https://sourceware.org/gdb/wiki/VariableLengthArray
There's an implementation in archer.git that works in some cases, but it isn't considered good enough to go in trunk.
gdb: No symbol "tulip" in current context

gdb: No symbol "tulip" in current context

By : chethan1801
Date : March 29 2020, 07:55 AM
help you fix your problem In order to see local variables in GDB you have to break the program execution inside that function. You are trying to print the value after the program has terminated and that is impossible.
Try putting a breakpoint at line 10, I think:
code :
(gdb) br 10
(gdb) run
(gdb) print tulip
(gdb) br main
(gdb) run
(gdb) next
(gdb) next
(gdb) ...
(gdb) print tulip
(gdb) start
(gdb) display tulip
(gdb) next
(gdb) next
(gdb) ...
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