[BUG]: build error when cmake apply libcudacxx patch

[gamdwk]

Is this a duplicate?

• I confirmed there appear to be no duplicate issues for this bug (https://github.com/NVIDIA/cuCollections/issues)

Type of Bug

Compile-time Error

Describe the bug

when I use cmake to build the example, It raise:

-- CPM: Adding package cuco@ (dev)
-- CPM: cuco: Using local package [email protected]
-- CPM: cuco: Adding package [email protected] (2.1.0)
-- rapids-cmake [libcudacxx]: failed to apply diff install_rules.diffrapids-cmake [libcudacxx]: git diff output: error: patch failed: cmake/libcudacxxInstallRules.cmake:28
-- error: cmake/libcudacxxInstallRules.cmake: patch does not apply
-- error: patch failed: lib/cmake/libcudacxx/libcudacxx-header-search.cmake.in:1
-- error: lib/cmake/libcudacxx/libcudacxx-header-search.cmake.in: patch does not apply
-- 
-- rapids-cmake [libcudacxx]: applied diff reroot_support.diff to fix issue: 'Support conda-forge usage of CMake rerooting [https://github.com/NVIDIA/libcudacxx/pull/490], requires libcudacxx/install_rules.diff.'
-- rapids-cmake [libcudacxx]: applied diff proclaim_return_type_nv_exec_check_disable.diff to fix issue: 'Use pragma to disable execution checks in cuda::proclaim_return_type. [https://github.com/NVIDIA/libcudacxx/pull/448]'
-- rapids-cmake [libcudacxx]: applied diff memory_resource.diff to fix issue: 'Allow {async_}resource_ref to be constructible from a pointer. [https://github.com/NVIDIA/libcudacxx/pull/439]'
-- Configuring done (3.1s)
-- Generating done (0.0s)

and then I compile:

/cache/build/_deps/cuco-src/include/cuco/detail/__config:28:2: error: #error "Support for relaxed constexpr is required"
   28 | #error "Support for relaxed constexpr is required"
      |  ^~~~~
/cache/build/_deps/cuco-src/include/cuco/detail/__config:32:2: error: #error "Support for extended device lambdas is required"
   32 | #error "Support for extended device lambdas is required"
      |  ^~~~~
make[2]: *** [CMakeFiles/cache_gcn.dir/build.make:77: CMakeFiles/cache_gcn.dir/cache.cu.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:133: CMakeFiles/cache_gcn.dir/all] Error 2
make: *** [Makefile:136: all] Error 2


How to fix it?


### How to Reproduce

just cmake ..

### Expected behavior

It can be compile correctly.

### Reproduction link

_No response_

### Operating System

Ubuntu Linux 20.04 and nvcr.io/nvidia/nvhpc:23.9-devel-cuda_multi-ubuntu20.04

### nvidia-smi output

I use nvidia  official docker container with nvidia Hpc Sdk 23.9 ,so the CUDA Version is not same with nvcc.
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 515.105.01   Driver Version: 515.105.01   CUDA Version: 11.7     |
|-------------------------------+----------------------+----------------------+
| GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
|                               |                      |               MIG M. |
|===============================+======================+======================|
|   0  NVIDIA A100 80G...  Off  | 00000000:31:00.0 Off |                    0 |
| N/A   36C    P0    44W / 300W |      0MiB / 81920MiB |      0%      Default |
|                               |                      |             Disabled |
+-------------------------------+----------------------+----------------------+
|   1  NVIDIA A800 80G...  Off  | 00000000:4B:00.0 Off |                    0 |
| N/A   40C    P0    50W / 300W |      0MiB / 81920MiB |      0%      Default |
|                               |                      |             Disabled |
+-------------------------------+----------------------+----------------------+
                                                                               
+-----------------------------------------------------------------------------+
| Processes:                                                                  |
|  GPU   GI   CI        PID   Type   Process name                  GPU Memory |
|        ID   ID                                                   Usage      |
|=============================================================================|
|  No running processes found                                                 |
+-----------------------------------------------------------------------------+

### NVCC version

nvcc: NVIDIA (R) Cuda compiler driver
Copyright (c) 2005-2022 NVIDIA Corporation
Built on Wed_Sep_21_10:33:58_PDT_2022
Cuda compilation tools, release 11.8, V11.8.89
Build cuda_11.8.r11.8/compiler.31833905_0

[PointKernel]

Thanks for reporting the issue.

There was a relevant discussion here #391. Essentially, our code relies on relaxed lambda and constexpr expressions thus building with --expt-extended-lambda --expt-relaxed-constexpr options is necessary.

[gamdwk]

Thanks! It can be compiled now.but the cmake build error still exists. So It means this error can be ignore?

[sleeepyjack]

Yes, those are falsely flagged as errors it seems. I'll ping the maintainers of our build ecosystem to see if we can get this resolved. Meanwhile I opened #398 which now prints a hint about which compiler flags are missing during build.

[PointKernel]

Resolved.