https://llvm.org/bugs/show_bug.cgi?id=25169
Bug ID: 25169
Summary: Undefined behavior in tuple_cat / make_tuple
Product: libc++
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: eugeni.stepa...@gmail.com
CC: llvm-bugs@lists.llvm.org, mclow.li...@gmail.com
Classification: Unclassified
I'm not really sure that the problem is in <tuple>, but I don't see anything
wrong with my code, and it works as expected with libstdc++.
$ cat 1.cc
#include <cstdio>
#include <tuple>
int main()
{
auto t1 = std::tuple_cat(std::make_tuple(std::make_tuple(1)));
return std::get<0>(std::get<0>(t1));
}
$ clang -stdlib=libc++ -std=c++14 -O2 1.cc -S -emit-llvm -o -
define i32 @main() #0 {
entry:
ret i32 undef
}
The tuple is undef.
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