https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90920
Bug ID: 90920
Summary: [9/10 Regression] ABI incompatibility in std::rotate
Product: gcc
Version: 9.1.0
Status: UNCONFIRMED
Keywords: ABI
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: redi at gcc dot gnu.org
CC: fdumont at gcc dot gnu.org
Target Milestone: ---
r263433 moved some checking from std::__rotate to its caller, std::rotate. It's
no longer safe to combine code compiled before and after that change:
tmp$ cat rot1.cc
#include <algorithm>
namespace std {
// explicit instantiation definition to simulate the linker choosing the
// definition from this file.
template int* __rotate(int*, int*, int*, random_access_iterator_tag);
}
tmp$ cat rot2.cc
#include <algorithm>
namespace std {
// explicit instantiation definition to simulate the linker choosing a
// definition from another file.
extern template int* __rotate(int*, int*, int*, random_access_iterator_tag);
}
int main()
{
int i = 0;
std::rotate(&i, &i, &i+1);
}
tmp$ /home/jwakely/gcc/9.1.0/bin/g++ -c rot1.cc
tmp$ /home/jwakely/gcc/8.3.0/bin/g++ -c rot2.cc
tmp$ /home/jwakely/gcc/9.1.0/bin/g++ rot1.o rot2.o
tmp$ ./a.out
Floating point exception (core dumped)
