https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85292
Bug ID: 85292
Summary: multiple definition of default argument emitted
Product: gcc
Version: 7.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: no...@turm-lahnstein.de
Target Milestone: ---
Please consider the following code:
#include <functional>
namespace timeit{
typedef std::function <void (void)> Fun;
//returns time needed for execution in seconds, calls setup once
template<typename Fun1>
void timeit(const Fun1 &f, const Fun &setup=[]{})
{
setup();
f();
}
}
int main(){
timeit::timeit([](){return 0.0;});
timeit::timeit([](){ return; });
}
When trying to compile, I get the following error message:
/tmp/cc4aRGV3.s: Assembler messages:
/tmp/cc4aRGV3.s:36: Error: symbol
`_ZNSt14_Function_base13_Base_managerIN6timeitUlvE_EE10_M_managerERSt9_Any_dataRKS4_St18_Manager_operation'
is already defined
/tmp/cc4aRGV3.s:58: Error: symbol
`_ZNSt17_Function_handlerIFvvEN6timeitUlvE_EE9_M_invokeERKSt9_Any_data' is
already defined
See it live at http://coliru.stacked-crooked.com/a/da080519413414da
I don't see, why this code should not compile (and if it is ill-formed then the
compiler and not the assembler should report the error).
