Re: left bit shift (<<) operator now demands line continuation

[Roman Rakus]

On 01/27/2010 08:34 PM, jwm@horde.net wrote:
> Configuration Information [Automatically generated, do not change]:
> Machine: x86_64
> OS: linux-gnu
> Compiler: gcc
> Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64' 
> -DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-pc-linux-gnu' 
> -DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL 
> -DHAVE_CONFIG_H   -I.  -I../bash -I../bash/include -I../bash/lib   -g -O2 -Wall
> uname output: Linux boost 2.6.31-17-server #54-Ubuntu SMP Thu Dec 10 18:06:56 
> UTC 2009 x86_64 GNU/Linux
> Machine Type: x86_64-pc-linux-gnu
>
> Bash Version: 4.0
> Patch Level: 33
> Release Status: release
>
> Description:
> bash 4.0 fails to parse a function that's parsed successfully by dash(1) as
> well as older versions of bash (3.1, 3.2):
>
> [jwm@boost:pts/6 ~>  cat inet
> swap32_posix()
> {
>         local funcname=swap32_posix
>         local arg
>         for arg in "$@"; do
>                 echo $((
>                         ($arg&  4278190080)>>  24 |
>                         ($arg&  16711680)>>  8 |
>                         ($arg&  65280)<<  8 |
>                         ($arg&  255)<<  24
>                 ))
>         done
> }
> [jwm@boost:pts/6 ~>  bash -n inet
> inet: line 6: unexpected EOF while looking for matching `)'
> inet: line 14: syntax error: unexpected end of file
> [jwm@boost:pts/6 ~>  dash -n inet
> [jwm@boost:pts/6 ~>
>
>
> Repeat-By:
> This affects the *left* bit shift operator, but *not* the right bit shift
> operator:
>
> [jwm@boost:pts/6 ~>  cat left.sh
> echo $((2<<  1
> ))
> [jwm@boost:pts/6 ~>  bash -n left.sh
> left.sh: line 1: unexpected EOF while looking for matching `)'
> left.sh: line 3: syntax error: unexpected end of file
> [jwm@boost:pts/6 ~>  cat right.sh
> echo $((1>>  2
> ))
> [jwm@boost:pts/6 ~>  bash -n right.sh
> [jwm@boost:pts/6 ~>
>
>
>    
4.1.2(1)-release is also affected
RR