https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84289
Bug ID: 84289
Summary: warning : variabile unitialized, emit right check only
with O(1,2,3) optimisation level (in try/catch)
Product: gcc
Version: 5.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: daffra.claudio at gmail dot com
Target Milestone: ---
Created attachment 43376
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43376&action=edit
file to reproduce error
i use this flags to compile program below :
-Wall -Wextra -pedantic-errors -std=c++11
g++ gives me NO warning, indeed with
-Wall -Wextra -pedantic-errors -std=c++11 -O3
g++ emit right warning
in this example g++ emit correct warning only when is active optimisation level
(123), but not with optimisation 0 or in other way
#include <iostream>
#include <string>
#include <stdexcept>
uint64_t StringToInteger ( std::string str, int _base )
{
uint64_t n;
try
{
n = std::stoull ( str,nullptr,_base );
}
catch ( std::invalid_argument )
{
std::cout << "error" ;
}
return n ;
}
int main ( void )
{
std::cout << StringToInteger ( "123",10 ) ;
return 0 ;
}
in this other example
#include <iostream>
#include <string>
#include <stdexcept>
uint64_t StringToInteger ( std::string str, int _base )
{
uint64_t n;
return n ;
}
int main ( void )
{
std::cout << StringToInteger ( "123",10 ) ;
return 0 ;
}
g++ emit warning ! with or without optimisation flags, rightly !
