cmake: add WOLFSSL_X86_64_BUILD_ASM option

Author: Mikhail Paulyshka

CMakeLists.txt

@@ -1577,6 +1577,7 @@ endif()
 # Set processor-specific build macros
 if("${CMAKE_SYSTEM_PROCESSOR}" MATCHES "x86_64|AMD64")
     set(WOLFSSL_X86_64_BUILD ON)
+    add_option("WOLFSSL_X86_64_BUILD_ASM" "Build ASM files" "yes" "yes;no")
     list(APPEND WOLFSSL_DEFINITIONS "-DWOLFSSL_X86_64_BUILD")
 elseif("${CMAKE_SYSTEM_PROCESSOR}" MATCHES "aarch64|arm64")
     list(APPEND WOLFSSL_DEFINITIONS "-DWOLFSSL_AARCH64_BUILD")

cmake/functions.cmake

@@ -510,9 +510,10 @@ function(generate_lib_src_list LIB_SOURCES)
               endif()
 
               if(BUILD_SP_X86_64)
-                   list(APPEND LIB_SOURCES
-                        wolfcrypt/src/sp_x86_64.c
-                        wolfcrypt/src/sp_x86_64_asm.S)
+                    list(APPEND LIB_SOURCES wolfcrypt/src/sp_x86_64.c)
+                    if(WOLFSSL_X86_64_BUILD_ASM)
+                         list(APPEND LIB_SOURCES wolfcrypt/src/sp_x86_64_asm.S)
+                    endif()
               endif()
 
               if(NOT BUILD_FIPS_V2 AND BUILD_SP_ARM32)