check if /proc/cpuinfo file exist in CMakeLists.txt

cmake_targets/CMakeLists.txt

@@ -132,16 +132,19 @@ Message("Architecture is ${CMAKE_SYSTEM_PROCESSOR}")
 if (CMAKE_SYSTEM_PROCESSOR STREQUAL "armv7l")
   set(C_FLAGS_PROCESSOR "-gdwarf-2 -mfloat-abi=hard -mfpu=neon -lgcc -lrt")
 else (CMAKE_SYSTEM_PROCESSOR STREQUAL "armv7l")
-  file(STRINGS "/proc/cpuinfo" CPUINFO REGEX flags LIMIT_COUNT 1)
-  #Message("CPUINFO is ${CPUINFO}")
-  if (CPUINFO MATCHES "avx2")
-    set(C_FLAGS_PROCESSOR "${C_FLAGS_PROCESSOR} -mavx2")
-  endif()
-  if (CPUINFO MATCHES "sse4_1")
-    set(C_FLAGS_PROCESSOR "${C_FLAGS_PROCESSOR} -msse4.1")
-  endif()
-  if (CPUINFO MATCHES "ssse3")
-    set(C_FLAGS_PROCESSOR "${C_FLAGS_PROCESSOR} -mssse3")
+  if(EXISTS  "/proc/cpuinfo")
+    file(STRINGS "/proc/cpuinfo" CPUINFO REGEX flags LIMIT_COUNT 1)
+    if (CPUINFO MATCHES "avx2")
+      set(C_FLAGS_PROCESSOR "${C_FLAGS_PROCESSOR} -mavx2")
+    endif()
+    if (CPUINFO MATCHES "sse4_1")
+      set(C_FLAGS_PROCESSOR "${C_FLAGS_PROCESSOR} -msse4.1")
+    endif()
+    if (CPUINFO MATCHES "ssse3")
+      set(C_FLAGS_PROCESSOR "${C_FLAGS_PROCESSOR} -mssse3")
+    endif()
+  else()
+    Message("/proc/cpuinfo does not exit. We will use manual CPU flags")
   endif()
 endif()
 
@@ -151,7 +154,7 @@ Message("C_FLAGS_PROCESSOR is ${C_FLAGS_PROCESSOR}")
 
 if (CMAKE_SYSTEM_PROCESSOR MATCHES "x86")
   if ( (NOT( C_FLAGS_PROCESSOR MATCHES "ssse3")) OR (NOT( C_FLAGS_PROCESSOR MATCHES "msse4.1")) )
-    Message(FATAL_ERROR "For x86 Architecture, you must have following flags: -mssse3 -msse4.1. The current detected flags are: ${C_FLAGS_PROCESSOR}. You can pass the flags manually in build script, for example: ./build_oai --cflags_processor \"-mssse3 -msse4.1\" ")
+    Message(FATAL_ERROR "For x86 Architecture, you must have following flags: -mssse3 -msse4.1. The current detected flags are: ${C_FLAGS_PROCESSOR}. You can pass the flags manually in build script, for example: ./build_oai --cflags_processor \"-mssse3 -msse4.1 -mavx2\" ")
   endif()
 endif()