beef_acc - acc flag added to C compiler

cmake/NVFortranCompiler.cmake

@@ -10,6 +10,10 @@ if(QE_ENABLE_OPENACC)
     set_target_properties(OpenACC::OpenACC_Fortran PROPERTIES
                           INTERFACE_COMPILE_OPTIONS "-acc"
                           INTERFACE_LINK_OPTIONS "-acc")
+    add_library(OpenACC::OpenACC_C INTERFACE IMPORTED)
+    set_target_properties(OpenACC::OpenACC_C PROPERTIES
+                          INTERFACE_COMPILE_OPTIONS "-acc"
+                          INTERFACE_LINK_OPTIONS "-acc")
 endif()
 
 if(QE_ENABLE_CUDA)

install/configure

@@ -4793,6 +4793,7 @@ $as_echo "$as_me: WARNING: Using legacy custom solver." >&2;}
    if test "$enable_openacc" == "yes"; then
       ldflags="$ldflags -acc"
       cuda_fflags="$cuda_fflags -acc"
+      CUDA_CFLAGS="$CUDA_CFLAGS -acc"
    fi
 
 fi

install/m4/x_ac_qe_cuda.m4

@@ -209,6 +209,7 @@ EOF
    if test "$enable_openacc" == "yes"; then
       ldflags="$ldflags -acc"
       cuda_fflags="$cuda_fflags -acc"
+      CUDA_CFLAGS="$CUDA_CFLAGS -acc"
    fi
 
 fi

install/make.inc.in

@@ -101,6 +101,9 @@ CUDA_RUNTIME=@gpu_runtime@
 # CUDA F90 Flags
 CUDA_F90FLAGS=@cuda_fflags@ $(MOD_FLAG)$(TOPDIR)/external/devxlib/src
 
+# CUDA C Flags
+CUDA_CFLAGS=@CUDA_CFLAGS@
+
 # C preprocessor and preprocessing flags - for explicit preprocessing,
 # if needed (see the compilation rules above)
 # preprocessing flags must include DFLAGS and IFLAGS