[boost] [regex] diagnosis and fix for #9544

Subject: [boost] [regex] diagnosis and fix for #9544
From: Peter A. Bigot (pab_at_[hidden])
Date: 2014-01-04 23:16:23

Trac rejected my comment because it has links in it, so here's the 
relevant information.

This issue arose as of 
[http://gcc.gnu.org/viewcvs/gcc?view=revision&revision=197248 GCC SVN 
commit 197248] which implements 
[http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3582.html 
N3582].  It occurs because the 
[http://gcc.gnu.org/viewcvs/gcc/trunk/gcc/cp/parser.c?r1=197248&r2=197247&pathrev=197248 
change on line 4109] preserves parentheses at the front end (with that 
change reverted, gcc works correctly).

This is now [http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59681 PR 
C++/59681].  The fix in GCC is not trivial, so I've just made 
[https://github.com/boostorg/regex/pull/1 pull #1] so the trivial fix 
for boost (remove the parens) can be applied.