Debug info for variadic templates

[kiranchandramohan]

Bugzilla Link	36745
Version	trunk
OS	All
CC	@adrian-prantl,@dwblaikie,@DougGregor,@pogo59

Extended Description

template<typename T>
T accumulator(T v) {
  return v;
}

template<typename T, typename... Args>
T accumulator(T first, Args... args) {
  return first + accumulator(args...);
}

int main()
{
long sum = accumulator(1, 3, 5, 7);
return sum;
}

The testcase is given above. This testcase is an example for variadic templates. The debug info generated for this testcase by clang seems to be incorrect. The accumulator is passed the values (1,3,5,7). All the non-first elements are shown with value 7 at the breakpoint. Ideally they should be first=1, args=3, args=5, args=7

Breakpoint 2, accumulator<int, int, int, int> (first=1, args=7, args=7, args=7) at simple_var.cpp:8 8 return first + accumulator(args...);

[llvmbot]

@llvm/issue-subscribers-c-11

Author: Kiran Chandramohan (kiranchandramohan)

| | | | --- | --- | | Bugzilla Link | [36745](https://llvm.org/bz36745) | | Version | trunk | | OS | All | | CC | @adrian-prantl,@dwblaikie,@DougGregor,@pogo59 | ## Extended Description template<typename T> T accumulator(T v) { return v; } template<typename T, typename... Args> T accumulator(T first, Args... args) { return first + accumulator(args...); } int main() { long sum = accumulator(1, 3, 5, 7); return sum; } The testcase is given above. This testcase is an example for variadic templates. The debug info generated for this testcase by clang seems to be incorrect. The accumulator is passed the values (1,3,5,7). All the non-first elements are shown with value 7 at the breakpoint. Ideally they should be first=1, args=3, args=5, args=7 Breakpoint 2, accumulator<int, int, int, int> (first=1, args=7, args=7, args=7) at simple_var.cpp:8 8 return first + accumulator(args...);

[llvmbot]

@llvm/issue-subscribers-debuginfo

Author: Kiran Chandramohan (kiranchandramohan)

| | | | --- | --- | | Bugzilla Link | [36745](https://llvm.org/bz36745) | | Version | trunk | | OS | All | | CC | @adrian-prantl,@dwblaikie,@DougGregor,@pogo59 | ## Extended Description template<typename T> T accumulator(T v) { return v; } template<typename T, typename... Args> T accumulator(T first, Args... args) { return first + accumulator(args...); } int main() { long sum = accumulator(1, 3, 5, 7); return sum; } The testcase is given above. This testcase is an example for variadic templates. The debug info generated for this testcase by clang seems to be incorrect. The accumulator is passed the values (1,3,5,7). All the non-first elements are shown with value 7 at the breakpoint. Ideally they should be first=1, args=3, args=5, args=7 Breakpoint 2, accumulator<int, int, int, int> (first=1, args=7, args=7, args=7) at simple_var.cpp:8 8 return first + accumulator(args...);

[dwblaikie]

Duplicate of #24643