[Patch, libstdc++] Add specific error message into exceptions

[Jonathan Wakely]

On 12/09/15 01:57 +0000, Tim Shen wrote:
>Ok then, let's not appending dynamic location string, but only throw a
>string literal pointer.

This looks great, and a *huge* improvement on the current errors even
without more precise location info.

OK for trunk, thanks very much for doing this.




>commit fc3343a2c719049620447f6dc20191e2af4895f6
>Author: Tim Shen <timshen@google.com>
>Date:   Thu Aug 27 21:42:40 2015 -0700
>
>    	PR libstdc++/67361
>    	* include/bits/regex_error.h: Add __throw_regex_error that
>    	supports string.
>    	* include/bits/regex_automaton.h: Add more specific exception
>    	messages.
>    	* include/bits/regex_automaton.tcc: Likewise.
>    	* include/bits/regex_compiler.h: Likewise.
>    	* include/bits/regex_compiler.tcc: Likewise.
>    	* include/bits/regex_scanner.h: Likewise.
>    	* include/bits/regex_scanner.tcc: Likewise.
>