Re: [PATCH 3/4] Use POSIX nm to simplify AIX export_symbols_cmds.

[Eric Blake]

On 03/10/2016 04:29 AM, Peter Rosin wrote:

>> +  elif test "$lt_cv_nm_interface" = "POSIX nm"; then
>> +    symxfrm="\\2 $ac_symprfx\\1 \\1"
>> +    lt_cv_sys_global_symbol_pipe="sed -n -e 's/^[[   
>> ]]*$ac_symprfx$sympat[[         ]][[    ]]*\($symcode$symcode*\)[[      ]][[ 
>>    ]]*.*$opt_cr$/$symxfrm/p'"
> 
> Do you really need to handle leading and multiple whitespace here?
> Posix, at least as seen here
>   http://pubs.opengroup.org/onlinepubs/009696699/utilities/nm.html
> seems quite clear on no leading space and one space only as separator.

No, POSIX states that " " means at least one whitespace (could be
multiple; implementations can align at will), and "Δ" means exactly one
space character.  Since nm didn't use the delta character, the code is
correct at looking for multiple whitespace.
http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap05.html

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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