Fix warnings with Intel 2021.4

[alexxy/gromacs.git] / cmake / gmxTestCompilerProblems.cmake

diff --git a/cmake/gmxTestCompilerProblems.cmake b/cmake/gmxTestCompilerProblems.cmake
index 620f1767eda7c32b832e6a60faaa169539923fba..c382cc85bbf57d59fe9ee3c69b7e35b8dcccb7c6 100644 (file)
--- a/cmake/gmxTestCompilerProblems.cmake
+++ b/cmake/gmxTestCompilerProblems.cmake
@@ -62,6 +62,8 @@ macro(gmx_test_compiler_problems)
         if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5)
             set(cxx_required_version "Clang 5")
         endif()
+    elseif(CMAKE_CXX_COMPILER_ID MATCHES "IntelLLVM")
+        # All versions of IntelLLVM (a.k.a. DPCPP) compiler so far support C++17
     else()
         message(WARNING "You are using an unsupported compiler. Please make sure it fully supports C++17.")
     endif()
@@ -70,9 +72,15 @@ macro(gmx_test_compiler_problems)
                             "Earlier versions don't have full C++17 support.")
     endif()
 
-    if (CMAKE_CXX_COMPILER_ID MATCHES "Intel")
+    if (CMAKE_CXX_COMPILER_ID MATCHES "Intel" AND NOT CMAKE_CXX_COMPILER_ID MATCHES "IntelLLVM")
         message(WARNING "The Intel classic compiler is no longer supported. It may pass the tests, but is not tested by the GROMACS developers. Use the clang-based compiler from oneAPI, or gcc")
     endif()
+    # Intel LLVM 2021.2 defaults to no-finite-math which isn't OK for GROMACS and its dependencies (muParser and GTest).
+    # This is why we set the flags globally via CMAKE_CXX_FLAGS
+    if(GMX_INTEL_LLVM AND GMX_INTEL_LLVM_VERSION GREATER_EQUAL 2021020)
+        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-finite-math-only")
+    endif()
+
 
     if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "XL")
         check_cxx_source_compiles(