https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115468
Bug ID: 115468
Summary: Convenience functions defined in gdbinit.in does not
handle spaces in expression correctly
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: other
Assignee: unassigned at gcc dot gnu.org
Reporter: user202729 at protonmail dot com
Target Milestone: ---
There's a file gcc/gdbinit.in in the source tree that defines a few convenience
functions, for example:
define pp
eval "set $debug_arg = $%s", $argc ? "arg0" : ""
call debug ($debug_arg)
end
to be used as "pp" to pretty-print the last-printed value, or "pp [expression]"
to pretty-print the expression.
However, this definition will mysteriously error out when the expression
contains a space because the parts after the space will be put in arg1, etc.
I can think of some ways to fix this.
1. Modify the definition of pp to the following:
define pp
if $argc == 0
set $debug_arg = $
else
set $tmp = "set $debug_arg = "
set $i = 0
while $i < $argc
eval "set $tmp = \"%s $arg%d\"", $tmp, $i
set $i = $i + 1
end
eval "%s", $tmp
end
call debug ($debug_arg)
end
But the problem is that we need to repeat this to every other function, which
is not elegant. (string concatenation technique was from
https://stackoverflow.com/a/40918181/)
2. Throw an error when argc >= 2.
Also not elegant.
3. Edit gdb to implement something like "$arg@" which is equivalent to "$arg0
$arg1 ... $arg[$argc-1]"
4. Use Python.
What do you think?
