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[Bug cli/23135] New: Configuring logging inside a user-defined command does not take effect


https://sourceware.org/bugzilla/show_bug.cgi?id=23135

            Bug ID: 23135
           Summary: Configuring logging inside a user-defined command does
                    not take effect
           Product: gdb
           Version: 8.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: cli
          Assignee: unassigned at sourceware dot org
          Reporter: alex@alex-smith.me.uk
  Target Milestone: ---

In GDB 8.1, "set logging" commands inside a user-defined command do not take
effect when the user-defined command is executed. For example:

(gdb) define setup-logging
Type commands for definition of "setup-logging".
End with a line saying just "end".
>set logging redirect on
>set logging on foo.txt
>end
(gdb) setup-logging
(gdb) bt
#0  0x00007ffff69c2f4b in raise () from /lib64/libc.so.6
#1  0x00007ffff69ad591 in abort () from /lib64/libc.so.6
#2  0x0000000000401783 in FatalImpl (inFile=0x404d28
"Build/Release/Engine/Runtime/Engine/Source/Engine.cpp", inLine=47,
inFormat=<optimized out>) at
Build/Release/Engine/Runtime/Core/Source/Log.cpp:43
#3  0x0000000000403197 in Engine::Run (this=<optimized out>) at
Build/Release/Engine/Runtime/Engine/Source/Engine.cpp:47
#4  0x00000000004031ba in main (argc=<optimized out>, argv=<optimized out>) at
Build/Release/Engine/Runtime/Engine/Source/Main.cpp:23
(gdb) 

The command output is still appearing on stdout and foo.txt is empty.
Performing the "set logging" commands manually behaves as expected (the output
is redirected).

This worked in GDB 8.0 (and many prior versions). This change in behaviour has
broken my custom .gdbinit hooks to implement colour backtraces (they redirect
the output to a file and then invoke a shell command to colourise it).

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