message: Remove the cmake + nvcc warning (style of line directive is a GCC extension)
diff: @@ -23,9 +23,11 @@ if (${CMAKE_CXX_COMPILER_ID} MATCHES "Clang")
  elseif (${CMAKE_CXX_COMPILER_ID} MATCHES "GNU")
  list(APPEND PERFORMANCE_CXX_OPTIONS
  "-march=native"
  - "-pedantic"
  "-Wall"
  "--param" "max-completely-peel-times=3")
  + if (NOT MFEM_USE_CUDA)
  + list(APPEND PERFORMANCE_CXX_OPTIONS "-pedantic")
  + endif()
  endif()
  if (MFEM_USE_CUDA)
  