Skip to content

Add support for c++20 #486

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
rapids-bot merged 13 commits into from
Jan 16, 2026
+43 −8
Merged

Add support for c++20 #486

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
13 commits
Select commit Hold shift + click to select a range
4a4a2d4
add support for c++20
rgsl888prabhu Oct 13, 2025
5f8449b
Merge branch 'branch-25.12' into c++_20_support
rgsl888prabhu Oct 22, 2025
864fd2c
Merge branch 'main' into c++_20_support
rgsl888prabhu Oct 22, 2025
526aed5
Merge branch 'main' into c++_20_support
aliceb-nv Oct 29, 2025
88272d5
Merge branch 'main' into c++_20_support
rgsl888prabhu Nov 13, 2025
e773c94
Merge branch 'main' into c++_20_support
rgsl888prabhu Jan 5, 2026
a8292d0
Merge branch 'main' into c++_20_support
rgsl888prabhu Jan 7, 2026
f4352e2
fix style
rgsl888prabhu Jan 7, 2026
5c6f6e9
Merge branch 'c++_20_support' of github.com:rgsl888prabhu/cuopt_publi…
rgsl888prabhu Jan 9, 2026
34bbe46
fix bug
rgsl888prabhu Jan 9, 2026
823d84f
fix style
rgsl888prabhu Jan 9, 2026
41416ce
Merge branch 'main' into c++_20_support
rgsl888prabhu Jan 9, 2026
dcbf60a
Merge branch 'main' into c++_20_support
rgsl888prabhu Jan 14, 2026
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
34 changes: 32 additions & 2 deletions cpp/CMakeLists.txt
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -29,6 +29,9 @@ project(
LANGUAGES CXX CUDA C
)

# Disable C++20 module scanning as the codebase doesn't use modules
set(CMAKE_CXX_SCAN_FOR_MODULES OFF CACHE BOOL "Disable C++20 module scanning")

Comment on lines +32 to +34
Copy link

@coderabbitai coderabbitai bot Jan 9, 2026

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

⚠️ Potential issue | 🟡 Minor

Be explicit about whether you want to override user cache values for module scanning.

set(CMAKE_CXX_SCAN_FOR_MODULES OFF CACHE BOOL ...) won’t change an existing cache value, so module scanning could remain enabled for targets that don’t explicitly set CXX_SCAN_FOR_MODULES OFF. If the intent is “always disable”, consider FORCE; if the intent is “default off, but user can opt in”, consider guarding with if(NOT DEFINED ...) to make that intent clear.

Proposed tweak (pick one) 
-# Disable C++20 module scanning as the codebase doesn't use modules
-set(CMAKE_CXX_SCAN_FOR_MODULES OFF CACHE BOOL "Disable C++20 module scanning")
+# Disable C++20 module scanning as the codebase doesn't use modules
+# Option A: default-off (user can override via -D...)
+if(NOT DEFINED CMAKE_CXX_SCAN_FOR_MODULES)
+  set(CMAKE_CXX_SCAN_FOR_MODULES OFF CACHE BOOL "Disable C++20 module scanning")
+endif()
+
+# Option B: always-off (override any existing cache)
+# set(CMAKE_CXX_SCAN_FOR_MODULES OFF CACHE BOOL "Disable C++20 module scanning" FORCE)
📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
# Disable C++20 module scanning as the codebase doesn't use modules
set(CMAKE_CXX_SCAN_FOR_MODULES OFF CACHE BOOL "Disable C++20 module scanning")
# Disable C++20 module scanning as the codebase doesn't use modules
# Option A: default-off (user can override via -D...)
if(NOT DEFINED CMAKE_CXX_SCAN_FOR_MODULES)
set(CMAKE_CXX_SCAN_FOR_MODULES OFF CACHE BOOL "Disable C++20 module scanning")
endif()
# Option B: always-off (override any existing cache)
# set(CMAKE_CXX_SCAN_FOR_MODULES OFF CACHE BOOL "Disable C++20 module scanning" FORCE)
🤖 Prompt for AI Agents 
In @cpp/CMakeLists.txt around lines 32 - 34, The CMake cache variable
CMAKE_CXX_SCAN_FOR_MODULES is being set without clarifying whether you intend to
override an existing user cache value; change the directive to explicitly
express intent: if you always want to disable module scanning, replace the
current set(...) with set(CMAKE_CXX_SCAN_FOR_MODULES OFF CACHE BOOL "Disable
C++20 module scanning" FORCE), otherwise make it a user-default by guarding with
if(NOT DEFINED CMAKE_CXX_SCAN_FOR_MODULES) before calling
set(CMAKE_CXX_SCAN_FOR_MODULES OFF CACHE BOOL "Disable C++20 module scanning")
so users can opt in.

rapids_cmake_write_version_file(include/cuopt/version_config.hpp)
# ##################################################################################################
# - build type ------------------------------------------------------------------------------------
Expand Down Expand Up @@ -243,11 +246,12 @@ set_target_properties(cuopt
INSTALL_RPATH "\$ORIGIN"

# set target compile options
CXX_STANDARD 17
CXX_STANDARD 20
CXX_STANDARD_REQUIRED ON
CUDA_STANDARD 17
CUDA_STANDARD 20
CUDA_STANDARD_REQUIRED ON
INTERFACE_POSITION_INDEPENDENT_CODE ON
CXX_SCAN_FOR_MODULES OFF
)

target_compile_definitions(cuopt PUBLIC "CUOPT_LOG_ACTIVE_LEVEL=RAPIDS_LOGGER_LOG_LEVEL_${LIBCUOPT_LOGGING_LEVEL}")
Expand Down Expand Up @@ -446,6 +450,14 @@ endif()

if(NOT BUILD_LP_ONLY)
add_executable(cuopt_cli cuopt_cli.cpp)

set_target_properties(cuopt_cli
PROPERTIES
CXX_STANDARD 20
CXX_STANDARD_REQUIRED ON
CXX_SCAN_FOR_MODULES OFF
)

target_compile_options(cuopt_cli
PRIVATE "$<$<COMPILE_LANGUAGE:CXX>:${CUOPT_CXX_FLAGS}>"
"$<$<COMPILE_LANGUAGE:CUDA>:${CUOPT_CUDA_FLAGS}>"
Expand Down Expand Up @@ -486,6 +498,14 @@ endif()
option(BUILD_MIP_BENCHMARKS "Build MIP benchmarks" OFF)
if(BUILD_MIP_BENCHMARKS AND NOT BUILD_LP_ONLY)
add_executable(solve_MIP ../benchmarks/linear_programming/cuopt/run_mip.cpp)

set_target_properties(solve_MIP
PROPERTIES
CXX_STANDARD 20
CXX_STANDARD_REQUIRED ON
CXX_SCAN_FOR_MODULES OFF
)

target_compile_options(solve_MIP
PRIVATE "$<$<COMPILE_LANGUAGE:CXX>:${CUOPT_CXX_FLAGS}>"
"$<$<COMPILE_LANGUAGE:CUDA>:${CUOPT_CUDA_FLAGS}>"
Expand All @@ -510,6 +530,16 @@ endif()
option(BUILD_LP_BENCHMARKS "Build LP benchmarks" OFF)
if(BUILD_LP_BENCHMARKS)
add_executable(solve_LP ../benchmarks/linear_programming/cuopt/run_pdlp.cu)

set_target_properties(solve_LP
PROPERTIES
CXX_STANDARD 20
CXX_STANDARD_REQUIRED ON
CUDA_STANDARD 20
CUDA_STANDARD_REQUIRED ON
CXX_SCAN_FOR_MODULES OFF
)

target_compile_options(solve_LP
PRIVATE "$<$<COMPILE_LANGUAGE:CXX>:${CUOPT_CXX_FLAGS}>"
"$<$<COMPILE_LANGUAGE:CUDA>:${CUOPT_CUDA_FLAGS}>"
Expand Down
8 changes: 6 additions & 2 deletions cpp/libmps_parser/CMakeLists.txt
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
# cmake-format: off
# SPDX-FileCopyrightText: Copyright (c) 2024-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
# SPDX-FileCopyrightText: Copyright (c) 2024-2026, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
# SPDX-License-Identifier: Apache-2.0
# cmake-format: on

Expand All @@ -16,6 +16,9 @@ project(
LANGUAGES CXX
)

# Disable C++20 module scanning as the codebase doesn't use modules
set(CMAKE_CXX_SCAN_FOR_MODULES OFF CACHE BOOL "Disable C++20 module scanning")

# Write the version header
rapids_cmake_write_version_file(include/mps_parser/version_config.hpp)

Expand Down Expand Up @@ -79,9 +82,10 @@ set_target_properties(mps_parser
INSTALL_RPATH "\$ORIGIN"

# set target compile options
CXX_STANDARD 17
CXX_STANDARD 20
CXX_STANDARD_REQUIRED ON
INTERFACE_POSITION_INDEPENDENT_CODE ON
CXX_SCAN_FOR_MODULES OFF
)

target_compile_options(mps_parser
Expand Down
5 changes: 3 additions & 2 deletions cpp/libmps_parser/tests/CMakeLists.txt
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
# cmake-format: off
# SPDX-FileCopyrightText: Copyright (c) 2024-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
# SPDX-FileCopyrightText: Copyright (c) 2024-2026, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
# SPDX-License-Identifier: Apache-2.0
# cmake-format: on

Expand All @@ -13,9 +13,10 @@ function(ConfigureTest CMAKE_TEST_NAME)
set_target_properties(${CMAKE_TEST_NAME}
PROPERTIES
# set target compile options
CXX_STANDARD 17
CXX_STANDARD 20
CXX_STANDARD_REQUIRED ON
INTERFACE_POSITION_INDEPENDENT_CODE ON
CXX_SCAN_FOR_MODULES OFF
)

target_include_directories(${CMAKE_TEST_NAME}
Expand Down
4 changes: 2 additions & 2 deletions cpp/tests/examples/routing/CMakeLists.txt
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
# cmake-format: off
# SPDX-FileCopyrightText: Copyright (c) 2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
# SPDX-FileCopyrightText: Copyright (c) 2025-2026, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
# SPDX-License-Identifier: Apache-2.0
# cmake-format: on

Expand All @@ -17,7 +17,7 @@ set_target_properties(
pdptw_mixed_fleet
cvrp_daily_deliveries
PROPERTIES
CUDA_STANDARD 17
CUDA_STANDARD 20
CUDA_STANDARD_REQUIRED ON
)

Expand Down