[ConnorBaker]

Problem

3.8.0's host ABI test (test/host/abi) demangles the symbols that ${CMAKE_NM} lists with ${NVSHMEM_CXXFILT}. CMake finds CMAKE_NM with the compiler's target prefix, for example aarch64-unknown-linux-gnu-nm for aarch64-unknown-linux-gnu-g++. NVSHMEM_CXXFILT, however, is found by its unprefixed names only:

find_program(NVSHMEM_CXXFILT NAMES c++filt llvm-cxxfilt REQUIRED)

A cross toolchain that installs only prefixed binutils therefore fails to configure:

CMake Error at test/host/abi/CMakeLists.txt:2 (find_program):
  Could not find NVSHMEM_CXXFILT using the following names: c++filt,
  llvm-cxxfilt

Change

Derive a c++filt name from CMAKE_NM's prefix and search CMAKE_NM's directory first, then fall back to the previous names. The symbols are then demangled by the same binutils that listed them. A native build's CMAKE_NM has no prefix, so it still finds c++filt as before.

Testing

Built in Nixpkgs from the 3.8.0 release with this patch, CUDA 13.4, NVSHMEM_BUILD_TESTS=ON and NVSHMEM_BUILD_EXAMPLES=ON:

• x86_64-linux to aarch64-linux cross build (SM 12.1a): configures, generates and builds the host ABI link test, and installs. Without the patch it fails at configure with the error above.
• x86_64-linux native build (SM 8.9): configures, generates and builds the host ABI link test, and installs.
• A downstream CMake consumer of the installed package builds against both.

The patch applies unchanged to devel (2dca770), whose test/host/abi/CMakeLists.txt is identical to 3.8.0's.

🤖 Generated with Claude Code