https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61834
Bug ID: 61834
Summary: __attribute__((may_alias)) causes compilation error
with forward-declared constructor
Product: gcc
Version: 4.9.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: lopresti at gmail dot com
Created attachment 33135
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33135&action=edit
Source file demonstrating bug with may_alias
If you compile the attached stand-alone test case with:
g++ -S may_alias_bug.cc
...it compiles fine.
If you compile with:
g++ -DBUG -S may_alias_bug.cc
...it produces a compilation error:
may_alias_bug2.cc:16:8: error: prototype for ‘Thing1::Thing1(Thing2)’ does
not match any in class ‘Thing1’
This bug appears to exist at least as far back as GCC 4.4.7. The code compiles
fine with Clang and with the Intel C++ compiler, as you can see by
experimenting here: http://goo.gl/dDyljx
