https://llvm.org/bugs/show_bug.cgi?id=28662
Bug ID: 28662
Summary: Type with no linkage in signature: symbols for unique
entities link together
Product: clang
Version: trunk
Hardware: All
OS: All
Status: NEW
Keywords: miscompilation
Severity: normal
Priority: P
Component: C++11
Assignee: unassignedclangb...@nondot.org
Reporter: hst...@ca.ibm.com
CC: dgre...@apple.com, llvm-bugs@lists.llvm.org
Classification: Unclassified
Clang produces symbols for entities which cannot possibly be referenced from
another translation unit in such a way that distinct entities link together.
In the following program, the templates in question are neither equivalent nor
functionally equivalent.
Online compiler: http://melpon.org/wandbox/permlink/okS5TiGDAVgd8tb0
### SOURCE (a.cc):
extern "C" void abort();
void bar();
namespace {
template <typename T> struct A { A(int); char sizer[1]; };
}
template <typename T> void foo(char (*)[sizeof A<T>(T(0))]) {
static unsigned cnt = 0;
if (cnt++) abort();
}
int main(void) { bar(); foo<int>(0); }
### SOURCE (b.cc):
extern "C" void abort();
namespace {
template <typename T> struct A { A(int); char sizer[2]; };
}
template <typename T> void foo(char (*)[sizeof A<T>(T(0))]) {
static unsigned cnt = 0;
if (cnt++) abort();
}
void bar() { foo<int>(0); }
### COMMANDS:
clang++ -c -o a.o -std=c++11 a.cc
clang++ -c -o b.o -std=c++11 b.cc
clang++ -o a.out a.o b.o
./a.out
### EXPECTED OUTPUT:
rc=0
### ACTUAL OUTPUT:
(aborts)
### COMPILER VERSION INFO (clang++ -v):
clang version 4.0.0 (trunk 276290)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/llvm-head/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.3
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Selected multilib: .;@m64
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