To debug package, you should install package-dbg on Void Linux:
# xbps-install void-repo-debug
# xbps-install -S jemalloc-dbg
Definitely, the package-dbg doesn’t include source files, so the source files should be downloaded separately.
References:
Repositories;
Debug sources not found by gdb.
On Void Linux, the /sys/kernel/tracing is empty, which means the ftrace control directory is not mounted automatically, so you need mount it manually:
# mount -t tracefs nodev /sys/kernel/tracing
# cd /sys/kernel/tracing
# ls
README free_buffer set_event trace_clock
available_events function_profile_enabled set_event_notrace_pid trace_marker
available_filter_functions hwlat_detector set_event_pid trace_marker_raw
......I installed glib-devel on Void Linux, and wrote a simple program for test. But the compilation reported following error:
# gcc -I/usr/include/glib-2.0 main.c -lglib-2.0
......
/usr/include/glib-2.0/glib/gtypes.h:32:10: fatal error: glibconfig.h: No such file or directory
32 | #include <glibconfig.h>
| ^~~~~~~~~~~~~~
compilation terminated.
glibconfig.h is in /usr/lib/glib-2.0/include directory, so it should be added into header file search path:
# gcc -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include main.c -lglib-2.0
#Yesterday, I came across a crash issue when program accessed “out of bound” memory:
......
func = 0x7ffff7eb1dc8 <Address 0x7ffff7eb1dc8 out of bounds>
......
After some debugging, I found the reason is program uses dlopen to load some dynamic library, records the memory address of the library, but still read the memory after dlclose it.
Both gcc and clang define __COUNTER__ marco:
Defined to an integer value that starts at zero and is incremented each time the COUNTER macro is expanded.
Check following code:
# cat foo.c
#include <stdio.h>
void foo1(void)
{
printf("%s:%d\n", __func__, __COUNTER__);
}
void foo2(void)
{
printf("%s:%d\n", __func__, __COUNTER__);
}
# cat bar.c
#include <stdio.h>
void bar1(void)
{
printf("%s:%d\n", __func__, __COUNTER__);
}
void bar2(void)
{
printf("%s:%d\n", __func__, __COUNTER__);
}
# cat main.c
#include "foo.h"
#include "bar.h"
int main(void)
{
foo1();
foo2();
bar1();
bar2();
return 0;
}
Run the program:
# ./main
foo_1:0
foo_2:1
bar_1:0
bar_2:1
You can see for every translate unit (.c) file, the __COUNTER__ begins at 0.
P.S., the code can be referenced here.