Subject: Re: cygwin-3.1.x seems to break emacs + gdb
To: Ryan Johnson <ryan DOT johnson AT cs DOT utoronto DOT ca>
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Date: Tue, 17 Mar 2020 08:55:48 -0400
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From: Ken Brown via Cygwin <cygwin AT cygwin DOT com>
Reply-To: Ken Brown <kbrown AT cornell DOT edu>
Cc: cygwin <cygwin AT cygwin DOT com>
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On 3/16/2020 7:23 PM, Ryan Johnson wrote:
> Hi Ken,
> 
> (Apologies for private mailing you, but my attempts to message cygwin@ and 
> cygwin-developers@ are rejected with TLS errors... any chance you could forward 
> this info to an appropriate person for attention?)
> 
> I upgraded cygwin in order to get gcc9, but to my dismay gdb is completely 
> unusable inside emacs, due to weird output garbling. Both gdb/mi and 
> gud-gdb/fullname modes are affected, but the problem is easier to show here with 
> gud-gdb. See garbled output below.
> 
> The output below is from the self-built emacs-25.3.1 I normally use.
> 
> The official cygwin emacs is also affected, but not quite as badly. Technically 
> it's still sort of usable -- the ^[[21X^[[21C garbage is missing -- but line 
> endings are messed up (newline but no carriage return). Also, it's impossible to 
> navigate away from the gdb source buffer gdb is pointing to -- the source file 
> buffer even reopens itself if I kill it -- and gdb prints all kinds of garbage 
> whenever I switch back to it from other emacs windows.
> 
> A self-built gdb-7.8 I had been using without problems before the upgrade is 
> also affected in exactly the same way.
> 
> The issue does not seem to occur when running gdb by itself from the shell... 
> but then I lose all the emacs debugging niceties.
> 
> I hit the problem previously (early Feb), and was able to fix by reverting from 
> cygwin-3.1.2-1 back to the previous cygwin-3.0.7-1
> 
> I was able to fix the problem again today by reverting to cygwin-3.0.7-1. The 
> attached cygcheck.out comes from the broken cygwin-3.1.4-1 I upgraded to -- and 
> back away from -- today.
> 
> Any ideas? Maybe this is related to the new console handling stuff I saw 
> discussed on cygwin-dev a little while ago?
> 
> Thanks!
> Ryan
> 
> === EXAMPLE GARBLED OUTPUT ===
> 
> Current directory is /home/Ryan/experiments/xxxxxxxxxxxxx/
> GNU gdb (GDB) (Cygwin 8.2.1-1) 8.2.1
> Copyright (C) 2018 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
> This is free software: you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law.
> Type "show copying" and "show warranty" for details.
> This GDB was configured as "x86_64-pc-cygwin".
> Type "show configuration" for configuration details.
> For bug reporting instructions, please see:
> <http://www.gnu.org/software/gdb/bugs/>.
> Find the GDB manual and other documentation resources online at:
>      <http://www.gnu.org/software/gdb/documentation/>.
> 
> For help, type "help".
> Type "apropos word" to search for commands related to "word"...
> Reading symbols from a.exe...done.
> (gdb) start
> Temporary breakpoint 1 at 0x10041735d: file xxxxxxxxxxxxx-test.cpp, line 1586.
> Starting program: /home/Ryan/experiments/xxxxxxxxxxxxx/a.exe
>    This is free software: you are free to change and redistribute it.^[[12X^[[12C
> There is NO
> WARRANTY, to the extent permitted by law.^[[39X^[[39C
>                                           Type "show copying" and "show warranty"
>   for details.^[[67X^[[67C
>               This GDB was configured as "x86_64-pc-cygwin".^[[21X^[[21C
>                                                             Type "show configurat
> ion" for configuration details.^[[49X^[[49C
>                                 For bug reporting instructions, please see:
> <http:
> //www.gnu.org/software/gdb/bugs/>.^[[46X^[[46C
>                                    Find the GDB manual and other documentation re
> sources online at:^[[62X^[[62C
> <http://www.gnu.org/software/gdb/documentation/>.^[[9X^[[9C
> ^[[80X^[[80C
> For help,
>   type "help".^[[67X^[[67C
>               Type "apropos word" to search for commands related to "word"...
> Read
> ing symbols from a.exe...done.^[[50X^[[50C
>                                (gdb) Temporary breakpoint 1 at 0x10041735d: file
> xxxxxxxxxxxxx-test.cpp, line 1586.^[[47X^[[47C
>                                   Starting program: /home/Ryan/experiments/xxxxxx
> xxxxxx/a.exe^[[68X^[[68C
> ^[[80X^[[80C  This is free software: you are free to change and redistribute 
> it.^[[12X^[[12C
> There is NO
> WARRANTY, to the extent permitted by law.^[[39X^[[39C
>                                           Type "show copying" and "show warranty"
>   for details.^[[67X^[[67C
>               This GDB was configured as "x86_64-pc-cygwin".^[[21X^[[21C
>                                                             Type "show configurat
> ion" for configuration details.^[[49X^[[49C
>                                 For bug reporting instructions, please see:
> <http:
> //www.gnu.org/software/gdb/bugs/>.^[[46X^[[46C
>                                    Find the GDB manual and other documentation re
> sources online at:^[[62X^[[62C
> <http://www.gnu.org/software/gdb/documentation/>.^[[9X^[[9C
> ^[[80X^[[80C
> For help,
>   type "help".^[[67X^[[67C
>               Type "apropos word" to search for commands related to "word"...
> Read
> ing symbols from a.exe...done.^[[50X^[[50C
>                                (gdb) Temporary breakpoint 1 at 0x10041735d: file
> xxxxxxxxxxxxx-test.cpp, line 1586.^[[47X^[[47C
>                                   Starting program: /home/Ryan/experiments/xxxxxx
> xxxxxx/a.exe^[[68X^[[68C
>               [New Thread 7556.0x1238]^[[43X^[[43C
>                                       [New Thread 7556.0x3290]^[[19X^[[19C
> ^[[80X^[[80C[New Thread 7556.0
> 9ac]^[[76X^[[76C
> ^[[80X^[[80C[New Thread 7556.0x3ea4]
> ^[[80X^[[80C             This GDB was configured as "x86_64-pc-cygwin".^[[21X^[[21C
>                                                             Type "show configurat
> ion" for configuration details.^[[49X^[[49C
>                                 For bug reporting instructions, please see:
> <http:
> //www.gnu.org/software/gdb/bugs/>.^[[46X^[[46C
>                                    Find the GDB manual and other documentation re
> sources online at:^[[62X^[[62C
> <http://www.gnu.org/software/gdb/documentation/>.^[[9X^[[9C
> ^[[80X^[[80C
> For help,
>   type "help".^[[67X^[[67C
>               Type "apropos word" to search for commands related to "word"...
> Read
> ing symbols from a.exe...done.^[[50X^[[50C
>                                (gdb) Temporary breakpoint 1 at 0x10041735d: file
> xxxxxxxxxxxxx-test.cpp, line 1586.^[[47X^[[47C
>                                   Starting program: /home/Ryan/experiments/xxxxxx
> xxxxxx/a.exe^[[68X^[[68C
>               [New Thread 7556.0x1238]^[[43X^[[43C
>                                       [New Thread 7556.0x3290]^[[19X^[[19C
>                                                               [New Thread 7556.0x
> 9ac]^[[76X^[[76C
>      [New Thread 7556.0x3ea4]^[[52X^[[52C
> ^[[80X^[[80C             This GDB was configured as "x86_64-pc-cygwin".^[[21X^[[21C
>                                                             Type "show configurat
> ion" for configuration details.^[[49X^[[49C
>                                 For bug reporting instructions, please see:
> <http:
> //www.gnu.org/software/gdb/bugs/>.^[[46X^[[46C
>                                    Find the GDB manual and other documentation re
> sources online at:^[[62X^[[62C
> <http://www.gnu.org/software/gdb/documentation/>.^[[9X^[[9C
> ^[[80X^[[80C
> For help,
>   type "help".^[[67X^[[67C
>               Type "apropos word" to search for commands related to "word"...
> Read
> ing symbols from a.exe...done.^[[50X^[[50C
>                                (gdb) Temporary breakpoint 1 at 0x10041735d: file
> xxxxxxxxxxxxx-test.cpp, line 1586.^[[47X^[[47C
>                                   Starting program: /home/Ryan/experiments/xxxxxx
> xxxxxx/a.exe^[[68X^[[68C
>               [New Thread 7556.0x1238]^[[43X^[[43C
>                                       [New Thread 7556.0x3290]^[[19X^[[19C
>                                                               [New Thread 7556.0x
> 9ac]^[[76X^[[76C
>      [New Thread 7556.0x3ea4]^[[52X^[[52C
> ^[[80X^[[80C
>                              Thread 1 "a" hit Temporary breakpoint 1, 0x00000001
> 041735d in main ()^[[62X^[[62C
>                        at xxxxxxxxxxxxx-test.cpp:1586^[[29X^[[29C
> ^Z^Z/home/Ryan/experiments/xxx
> xxxxxxxx/xxxxxxxxxxxxx-test.cpp:1586:58336:beg:0x10041735d^[[23X^[[23C
> (gdb)^[[18X^[[18C

Hi Ryan,

Yes, I would guess this is related to the new pty code.  A similar problem was 
reported in

   https://sourceware.org/pipermail/cygwin/2020-March/243939.html,

with a suggested workaround in

   https://sourceware.org/pipermail/cygwin/2020-March/243955.html

Ken
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