http://llvm.org/bugs/show_bug.cgi?id=20090
Bug ID: 20090
Summary: Instantiation depth hit in recursive constexpr
function definition
Product: clang
Version: trunk
Hardware: Macintosh
OS: MacOS X
Status: NEW
Keywords: compile-fail
Severity: normal
Priority: P
Component: C++11
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
Created attachment 12688
--> http://llvm.org/bugs/attachment.cgi?id=12688&action=edit
Exact error message
Hi,
The following code hits the recursive instantiation depth limit on Clang
r211266:
------------------------------------------------------------------------------
template <typename T>
constexpr T fact(T n)
{ return n == 0 ? 1 : [=]{ return n * fact(n-1); }(); }
// template int fact(int);
int main() { fact(1); }
------------------------------------------------------------------------------
If you explicitly instantiate the function template (uncomment the line
above main), the problem goes away. The problem also goes away if fact
is not constexpr.
The exact command line is:
~/code/llvm/build/bin/clang++ -std=c++1y -o /dev/null
~/desktop/bugreport/worksheet.cpp
Regards,
Louis Dionne
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