asm trick

grpc/server/cmake/third_party/boringssl/CMakeLists.txt

@@ -38,8 +38,21 @@ elseif(IOS)
             -DCMAKE_INSTALL_PREFIX:PATH=${BINARY_DIR}
             -DCMAKE_TOOLCHAIN_FILE:PATH=${CMAKE_TOOLCHAIN_FILE}
             -DIOS_PLATFORM=OS
+            -DOPENSSL_NO_ASM=ON # Note: https://github.com/grpc/grpc/issues/9440
         INSTALL_COMMAND true)
 else()
+    # We disable ASM optimizations for MSVC and iOS (see above for iOS), which 
+    # might have a performance impact on secure communications.
+    # This should be benchmarked/evaluated before we decide if it is worth 
+    # enabling them or not in our case.
+    #
+    # More information here:  https://github.com/grpc/grpc/issues/9440
+    if (MSVC)
+        set(OPENSSL_NO_ASM ON)
+    else()
+        set(OPENSSL_NO_ASM OFF)
+    endif()
+
     message(STATUS "Preparing external project \"boringssl\"...")
 
     ExternalProject_add(
@@ -50,5 +63,6 @@ else()
         CMAKE_ARGS
             -DCMAKE_INSTALL_PREFIX:PATH=${BINARY_DIR}
             -DCMAKE_POSITION_INDEPENDENT_CODE=ON
+            -DOPENSSL_NO_ASM=${OPENSSL_NO_ASM}
         INSTALL_COMMAND true)
 endif()