Boost C++ Libraries: Ticket #9544: gcc 4.9.0 -std=c++1y breakage

Marshall Clow — Sat, 04 Jan 2014 21:46:29 GMT

Could you try this program with the gcc that you are using, please?

struct Foo { int length; };
int main () {
	Foo * p = new Foo { 0 };
	++(p->length);
	return 0;
	}

Thanks!

Sat, 04 Jan 2014 22:46:45 GMT

No issues.

llc[1036]$ g++ --version
g++ (GCC) 4.9.0 20140104 (experimental)
Copyright (C) 2014 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
llc[1037]$ g++ -std=c++11 -c /tmp/f.cc
llc[1038]$ g++ -std=c++1y -c /tmp/f.cc
llc[1039]$

Sun, 05 Jan 2014 04:18:17 GMT

See the boost-dev mailing list for information relevant to this bug.

Marshall Clow — Sun, 05 Jan 2014 04:33:34 GMT

[ Marshall posting for Peter ]

This issue arose as of GCC SVN commit 197248 which implements N3582. It occurs because the change on line 4109 preserves parentheses at the front end (with that change reverted, gcc works correctly).

This is now PR C++/59681. The fix in GCC is not trivial, so I've just made pull #1 so the trivial fix for boost (remove the parens) can be applied.

status changed; resolution set

John Maddock — Thu, 13 Nov 2014 16:43:40 GMT

status new → closed
resolution → worksforme

This all appears to be working correctly in master and develop with gcc-4.9.0 and -std=gnu++1y so closing down.