Issues in option handling (Was: break no longer breaks out of loops defined in an outer context)

[Stephane Chazelas]

2017-03-03 08:27:03 -0500, Chet Ramey:
> On 3/1/17 4:58 PM, Stephane Chazelas wrote:
> 
> > BTW, there seems to have been a regression in the handling of the -O
> > option to the bash interpreter:
> 
> Thanks, I'll take a look.  It looks to be specific to the various
> compat* options.
[...]

See also:

$ POSIXLY_CORRECT=1 bash -c 'set +o posix; set +o' | grep posix
set +o posix
$ POSIXLY_CORRECT=1 bash +o posix -c 'set +o' | grep posix
set -o posix

(not a regression, already in 4.3)

I'd expect explicit command line options to take precedence over
the environment.

Another oddity:

$ env SHELLOPTS= bash -o posix -c :
$ env SHELLOPTS= bash +o posix -c :
bash: SHELLOPTS: readonly variable

-- 
Stephane