From 7ca4822a4c019a7ea5eaab1d5bb4f131aba92658 Mon Sep 17 00:00:00 2001
From: "M. Chornyi" <99709299+mc-nv@users.noreply.github.com>
Date: Wed, 9 Sep 2026 22:43:34 +0000
Subject: [PATCH] build: Update C++ standard from c++17 to c++20

Upstream PyTorch raised ATen's minimum required C++ standard from 17
to 20 (pytorch/pytorch#178150), which broke the pytorch_backend build.
Align this repo's CXX_STANDARD/CUDA_STANDARD default with that floor
for consistency across the stack.

TRI-1877
---
 src/CMakeLists.txt               | 6 +++---
 src/dali_executor/CMakeLists.txt | 2 +-
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 9176bf7..0e5aced 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -44,7 +44,7 @@ target_link_libraries(
         dali_executor
 )
 
-set_target_properties(triton-dali-backend-utils PROPERTIES CXX_STANDARD 17)
+set_target_properties(triton-dali-backend-utils PROPERTIES CXX_STANDARD 20)
 
 
 add_library(
@@ -97,7 +97,7 @@ set_target_properties(
             BUILD_WITH_INSTALL_RPATH TRUE
             INSTALL_RPATH_USE_LINK_PATH FALSE
             INSTALL_RPATH "${DALI_NV_INSTALL_PATH}"
-            CXX_STANDARD 17
+            CXX_STANDARD 20
 )
 
 set(
@@ -119,4 +119,4 @@ target_link_libraries(
         ${CMAKE_DL_LIBS}
 )
 
-set_target_properties(unittests PROPERTIES CXX_STANDARD 17)
+set_target_properties(unittests PROPERTIES CXX_STANDARD 20)
diff --git a/src/dali_executor/CMakeLists.txt b/src/dali_executor/CMakeLists.txt
index 4e68217..19af795 100644
--- a/src/dali_executor/CMakeLists.txt
+++ b/src/dali_executor/CMakeLists.txt
@@ -75,7 +75,7 @@ add_library(
         $<$<NOT:$<BOOL:${TRITON_DALI_SKIP_DOWNLOAD}>>:dali_whl>
 )
 
-set_property(TARGET dali_executor PROPERTY CXX_STANDARD 17)
+set_property(TARGET dali_executor PROPERTY CXX_STANDARD 20)
 target_include_directories(dali_executor PUBLIC BEFORE
         ${tritondalibackend_SOURCE_DIR}
         ${DALI_INCLUDE_DIR})