Check System setup for Navier-Stokes build

check whether the system is a 32bit-64bit version even for building
the Navier-Stokes tests.

Signed-off-by: naveen-ravi <[email protected]>

Author: naveen-rn

src/tests/integration/pde_solvers/navier-stokes/CMakeLists.txt

@@ -1,17 +1,21 @@
 if ("${CMAKE_SYSTEM_NAME}" MATCHES "Linux")
-
-  # Default to older SSE-instruction-based FFT library
-  if (LEGACY_ARCHITECTURE OR (NOT DEFINED(LEGACY_ARCHITECTURE)))
-     set(fft_library ${CMAKE_CURRENT_SOURCE_DIR}/libfft_sse.a )
-  else()
-    message(WARNING "Attempting to use libfft_avx.a, which only works on recent x86 architectures.")
-    set(fft_library ${CMAKE_CURRENT_SOURCE_DIR}/libfft_avx.a )
+  execute_process (COMMAND uname -m 
+                   OUTPUT_VARIABLE MACHINE_TYPE)
+  # checking whether the machine is of type 64-bit before proceeding further
+  if ("${MACHINE_TYPE}" MATCHES "x86_64")
+    # Default to older SSE-instruction-based FFT library
+    if (LEGACY_ARCHITECTURE OR (NOT DEFINED(LEGACY_ARCHITECTURE)))
+      set(fft_library ${CMAKE_CURRENT_SOURCE_DIR}/libfft_sse.a )
+    else()
+      message(WARNING "Attempting to use libfft_avx.a, which only works on recent x86 architectures.")
+      set(fft_library ${CMAKE_CURRENT_SOURCE_DIR}/libfft_avx.a )
+    endif()
+    add_executable( coarray_navier_stokes
+      coarray-shear_coll.F90
+      ${walltime_o}
+    )
+    target_link_libraries(coarray_navier_stokes OpenCoarrays ${fft_library})
   endif()
-  add_executable( coarray_navier_stokes
-    coarray-shear_coll.F90
-    ${walltime_o}
-  )
-  target_link_libraries(coarray_navier_stokes OpenCoarrays ${fft_library})
 else()
   # Skip Navier-Stokes build until an appropriate FFT has been found.
 endif()