Add NVHPC (nvc++) compiler support and CI build/test jobs

libeigen/eigen!2186

Closes #3032

Co-authored-by: Rasmus Munk Larsen <rmlarsen@gmail.com>

Eigen/src/Core/util/Macros.h

@@ -278,10 +278,10 @@
 
 /// \internal EIGEN_COMP_GNUC_STRICT set to 1 if the compiler is really GCC and not a compatible compiler (e.g., ICC,
 /// clang, mingw, etc.)
-#if EIGEN_COMP_GNUC &&                                                                                      \
+#if EIGEN_COMP_GNUC &&                                                                                   \
-    !(EIGEN_COMP_CLANG || EIGEN_COMP_ICC || EIGEN_COMP_CLANGICC || EIGEN_COMP_MINGW || EIGEN_COMP_PGI ||    \
+    !(EIGEN_COMP_CLANG || EIGEN_COMP_ICC || EIGEN_COMP_CLANGICC || EIGEN_COMP_MINGW || EIGEN_COMP_PGI || \
-      EIGEN_COMP_IBM || EIGEN_COMP_ARM || EIGEN_COMP_EMSCRIPTEN || EIGEN_COMP_FCC || EIGEN_COMP_CLANGFCC || \
+      EIGEN_COMP_NVHPC || EIGEN_COMP_IBM || EIGEN_COMP_ARM || EIGEN_COMP_EMSCRIPTEN || EIGEN_COMP_FCC || \
-      EIGEN_COMP_CPE || EIGEN_COMP_CLANGCPE || EIGEN_COMP_LCC)
+      EIGEN_COMP_CLANGFCC || EIGEN_COMP_CPE || EIGEN_COMP_CLANGCPE || EIGEN_COMP_LCC)
 #define EIGEN_COMP_GNUC_STRICT 1
 #else
 #define EIGEN_COMP_GNUC_STRICT 0

bench/btl/generic_bench/utils/utilities.h

@@ -34,7 +34,9 @@
 
 /* --- To print date and time of compilation of current source on stdout --- */
 
-#if defined(__GNUC__)
+#if defined(__NVCOMPILER)
+#define COMPILER "nvc++";
+#elif defined(__GNUC__)
 #define COMPILER "g++";
 #elif defined(__sun)
 #define COMPILER "CC";

ci/build.linux.gitlab-ci.yml

@@ -140,6 +140,20 @@ build:linux:docs:
 #       -DEIGEN_TEST_CUSTOM_CXX_FLAGS=-fsanitize=memory
 #       -DEIGEN_TEST_CUSTOM_LINKER_FLAGS=-fsanitize=memory
 
+######## NVHPC #################################################################
+
+# NVHPC (nvc++) uses NVIDIA's HPC SDK container image with the compilers
+# pre-installed. We override EIGEN_CI_INSTALL to avoid trying to apt-get
+# install the compiler.
+build:linux:x86-64:nvhpc-25.1:default:
+  extends: .build:linux:cross:x86-64
+  image: nvcr.io/nvidia/nvhpc:25.1-devel-cuda12.6-ubuntu22.04
+  variables:
+    EIGEN_CI_C_COMPILER: nvc
+    EIGEN_CI_CXX_COMPILER: nvc++
+    EIGEN_CI_INSTALL: ""
+    EIGEN_CI_CROSS_INSTALL: ""
+
 ######## CUDA ##################################################################
 
 .build:linux:cuda:
@@ -312,3 +326,4 @@ build:linux:cross:x86-64:clang-12:default:smoketest:
     - if: $CI_PIPELINE_SOURCE == "merge_request_event"
   tags:
     - saas-linux-medium-amd64
+

ci/test.linux.gitlab-ci.yml

@@ -220,6 +220,25 @@ test:linux:x86-64:clang-19:generic:avx512dq:unsupported:
   variables:
     EIGEN_CI_CTEST_LABEL: Unsupported
 
+##### NVHPC ####################################################################
+
+.test:linux:x86-64:nvhpc-25.1:default:
+  extends: .test:linux:x86-64
+  image: nvcr.io/nvidia/nvhpc:25.1-devel-cuda12.6-ubuntu22.04
+  needs: [ build:linux:x86-64:nvhpc-25.1:default ]
+  variables:
+    EIGEN_CI_INSTALL: ""
+
+test:linux:x86-64:nvhpc-25.1:default:official:
+  extends: .test:linux:x86-64:nvhpc-25.1:default
+  variables:
+    EIGEN_CI_CTEST_LABEL: Official
+
+test:linux:x86-64:nvhpc-25.1:default:unsupported:
+  extends: .test:linux:x86-64:nvhpc-25.1:default
+  variables:
+    EIGEN_CI_CTEST_LABEL: Unsupported
+
 ##### CUDA #####################################################################
 .test:linux:cuda:
   extends: .test:linux
@@ -420,3 +439,4 @@ test:linux:x86-64:clang-12:default:smoketest:
     - if: $CI_PIPELINE_SOURCE == "merge_request_event"
   tags:
     - saas-linux-medium-amd64
+

cmake/EigenTesting.cmake

@@ -458,7 +458,7 @@ macro(ei_get_compilerver VAR)
     endif()
     if(MSVC)
       set(${VAR} "${CMAKE_CXX_COMPILER_VERSION}")
-    elseif(${CMAKE_CXX_COMPILER_ID} MATCHES "PGI")
+    elseif(${CMAKE_CXX_COMPILER_ID} MATCHES "PGI" OR ${CMAKE_CXX_COMPILER_ID} MATCHES "NVHPC")
       set(${VAR} "${CMAKE_CXX_COMPILER_ID}-${CMAKE_CXX_COMPILER_VERSION}")
     else()
     # on all other system we rely on ${CMAKE_CXX_COMPILER}