[Bug build/34407] New: Unable to build gdb when $SHELL is non-POSIX fish

https://sourceware.org/bugzilla/show_bug.cgi?id=34407

            Bug ID: 34407
           Summary: Unable to build gdb when $SHELL is non-POSIX fish
           Product: gdb
           Version: 17.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: build
          Assignee: unassigned at sourceware dot org
          Reporter: nyanpasu64 at tuta dot io
  Target Milestone: ---

I'm unable to build gdb when having fish as my user shell. I get errors such
as:

lm32/stamp-mloop.lineno.sh (line 135): Unsupported use of '='. In fish, please
use 'set type mono'.
type=mono
^~~~~~~~^

This happens even when running configure and make under Bash.

I found out that in local.mk and sim/Makefile.in, CGEN_GEN_MLOOP invokes
lineno.sh to call `genmloop.sh` while passing `-shell $(SHELL)`. The problem is
lineno.sh uses the *environment* $(SHELL) (bash or fish) to run genmloop.sh,
causing genmloop.sh to crash.

Can this be changed to properly export SHELL and build under non-POSIX user
shells?

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