[Bug exp/21827] New: Regression: gdb command lookup became case-insensitive

["source-ware at trk dot nickurak.ca" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21827

            Bug ID: 21827
           Summary: Regression: gdb command lookup became case-insensitive
           Product: gdb
           Version: 8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: exp
          Assignee: unassigned at sourceware dot org
          Reporter: source-ware at trk dot nickurak.ca
  Target Milestone: ---

Input:

$ echo -e 'define aSDF\n print "in-func" \n end \n aSDF \n aSDF \n asdf"' | gdb

Expected behavior, as correctly observed in 7.x:

* function gets defined
* function gets called twice

$ echo -e 'define aSDF\n print "in-func" \n end \n aSDF \n aSDF \n asdf"' | gdb
GNU gdb (Ubuntu/Linaro 7.4-2012.04-0ubuntu2.1) 7.4-2012.04
Copyright (C) 2012 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-linux-gnu".
For bug reporting instructions, please see:
<http://bugs.launchpad.net/gdb-linaro/>.
(gdb) >>(gdb) $1 = "in-func"
(gdb) $2 = "in-func"
(gdb) $3 = "in-func"


Observed behavior, incorrect under 8.x:

* function gets defined but converted to lower-case
* calling function capitalized in the same was as it was defined fails

$ echo -e 'define aSDF\n print "in-func" \n end \n aSDF \n aSDF \n asdf"' | gdb
GNU gdb (GDB) Fedora 8.0-13.fc26
Copyright (C) 2017 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-redhat-linux-gnu".
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".
(gdb) >>(gdb) Undefined command: "aSDF".  Try "help".
(gdb) Undefined command: "aSDF".  Try "help".
(gdb) $1 = "in-func"

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