build: test V8_DISABLE_PRESERVE_MOST

common.gypi

@@ -50,7 +50,7 @@
 
     # Reset this number to 0 on major V8 upgrades.
     # Increment by one for each non-official patch applied to deps/v8.
-    'v8_embedder_string': '-node.10',
+    'v8_embedder_string': '-node.11',
 
     ##### V8 defaults for Node.js #####
 
@@ -588,6 +588,13 @@
           '_HAS_EXCEPTIONS=0',
           'BUILDING_V8_SHARED=1',
           'BUILDING_UV_SHARED=1',
+          # Node.js is built with clang-cl but native addons may be built
+          # with MSVC, which does not support preserve_most.
+          # As preserve_most changes the mangled name of a function in the
+          # Microsoft C++ ABI, the addons would fail to link against the
+          # exported symbols. So this define must be consistely set for
+          # both the V8 build and addon builds.
+          'V8_DISABLE_PRESERVE_MOST',
           # Stop <windows.h> from defining macros that conflict with
           # std::min() and std::max().  We don't use <windows.h> (much)
           # but we still inherit it from uv.h.

deps/v8/include/v8config.h

@@ -402,6 +402,7 @@ path. Add it with -I<path> to the command line
      || ((defined(__AARCH64EL__) || defined(_M_ARM64)) /* arm64, but ... */    \
          && !defined(_WIN32)))                         /* not on windows */    \
      && !defined(COMPONENT_BUILD)                      /* no component build */\
+     && !defined(V8_DISABLE_PRESERVE_MOST)             /* embedder opt-out */  \
      && __clang_major__ >= 17                          /* clang >= 17 */
 # define V8_HAS_ATTRIBUTE_PRESERVE_MOST (__has_attribute(preserve_most))
 #endif