std::exclusive_scan is not supported by hipcc

[ipdemes]

It seems like std::exclusive scan is not supported by hip compiler. I get an error like:

 error: no member named 'exclusive_scan' in namespace 'std'

Reproducer: add following diff to the vectorAdd example from HIP-examples:

diff --git a/vectorAdd/vectoradd_hip.cpp b/vectorAdd/vectoradd_hip.cpp
index 854ef37..55648da 100644
--- a/vectorAdd/vectoradd_hip.cpp
+++ b/vectorAdd/vectoradd_hip.cpp
@@ -24,6 +24,10 @@ THE SOFTWARE.
 #include <algorithm>
 #include <stdlib.h>
 #include<iostream>
+#include <functional>
+#include <numeric>
+#include <vector>
+
 #include "hip/hip_runtime.h"
 
 
@@ -92,6 +96,12 @@ int main() {
 
   cout << "hip Device prop succeeded " << endl ;
 
+  std::vector<int> data {3, 1, 4, 1, 5, 9, 2, 6};
+  std::vector<int> off;
+  off.resize(data.size());
+  std::exclusive_scan(data.begin(), data.end(),
+                     off.begin(),
+                     0);
 
   int i;
   int errors;

HIP compiler: HIP version: 4.2.21155-37cb3a34 clang version 12.0.0 (https://github.com/RadeonOpenCompute/llvm-project roc-4.2.0 21161 b204d7f0cae65b6cd4446eec50fc1fb675d582af) Target: x86_64-unknown-linux-gnu Thread model: posix InstalledDir: /opt/rocm-4.2.0/llvm/bin

[mangupta]

hipcc defaults to passing -std=c++11 to clang. And the Makefile for the vectorAdd sample does not pass any extra flags to hipcc. You would need to modify the Makefile to pass the right flags.

[cwsmith]

I seem to be hitting the same error with amdclang++ 14.0.0. The same code compiles without error with clang 14.0.0 (https://godbolt.org/z/4fdMhY51f).

$ amdclang++ -std=c++17 scan.cpp -o scan
scan.cpp:8:8: error: no member named 'exclusive_scan' in namespace 'std'
  std::exclusive_scan(data.begin(), data.end(), off.begin(), 0);
  ~~~~~^
1 error generated.

$ amdclang++ --version
AMD clang version 14.0.0 (https://github.com/RadeonOpenCompute/llvm-project roc-5.2.0 22204 50d6d5d5b608d2abd6af44314abc6ad20036af3b)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /opt/rocm-5.2.0/llvm/bin

$ cat scan.cpp 
#include <numeric>
#include <vector>
 
int main()
{
  std::vector<int> data {3, 1, 4, 1, 5, 9, 2, 6};
  std::vector<int> off(data.size());
  std::exclusive_scan(data.begin(), data.end(), off.begin(), 0);
}

[ppanchad-amd]

@ipdemes Is this still an issue for you? If not, please close ticket. Thanks!