https://bugs.llvm.org/show_bug.cgi?id=50928
Bug ID: 50928
Summary: Fatal error g++ (GCC) 12.0.0 20210625 in APFloat.h
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Support Libraries
Assignee: unassignedb...@nondot.org
Reporter: dr.duncan.p.simp...@gmx.com
CC: llvm-bugs@lists.llvm.org
Building llvm with g++ (GCC) 12.0.0 20210625 (experimental) fails due to:
[ 0%] Building CXX object
lib/Support/CMakeFiles/LLVMSupport.dir/APFixedPoint.cpp.o
In file included from /usr/local/include/c++/12.0.0/memory:76,
from
/home/dps/src/llvm/llvm-project/llvm/include/llvm/ADT/SmallVector.h:29,
from
/home/dps/src/llvm/llvm-project/llvm/include/llvm/ADT/SmallString.h:16,
from
/home/dps/src/llvm/llvm-project/llvm/include/llvm/ADT/APFixedPoint.h:20,
from
/home/dps/src/llvm/llvm-project/llvm/lib/Support/APFixedPoint.cpp:14:
/usr/local/include/c++/12.0.0/bits/unique_ptr.h: In instantiation of ‘typename
std::add_lvalue_reference<_Tp>::type std::unique_ptr<_Tp [],
_Dp>::operator[](std::size_t) const [with _Tp = llvm::APFloat; _Dp =
std::default_delete<llvm::APFloat []>; typename
std::add_lvalue_reference<_Tp>::type = llvm::APFloat&; std::size_t = long
unsigned int]’:
/home/dps/src/llvm/llvm-project/llvm/include/llvm/ADT/APFloat.h:634:40:
required from here
/usr/local/include/c++/12.0.0/bits/unique_ptr.h:658:48: error: invalid use of
incomplete type ‘class llvm::APFloat’
658 | noexcept(noexcept(std::declval<pointer>()[std::declval<size_t&>()]))
| ~~~~~~~~~~~~~~~~~~~~~~~^
In file included from
/home/dps/src/llvm/llvm-project/llvm/lib/Support/APFixedPoint.cpp:14:
/home/dps/src/llvm/llvm-project/llvm/include/llvm/ADT/APFixedPoint.h:25:7:
note: forward declaration of ‘class llvm::APFloat’
25 | class APFloat;
| ^~~~~~~
I think this is probably an issue with the llvm source code and not a g++ bug.
g++ 10 seems to accept this code so presumably what changed is what counts as
instantiation. I would suggest that instead of using getFirst it would be
simpler to make getIEEE a virtual method but that might be a larger change.
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