feat: enable whole-program optimization native modules by default (#3…

…7048)

* feat: enable whole-program optimization

Enable whole-program optimization in electron native modules by default.

Co-authored-by: Kyrylo Hrechykhin <khrechykhin@microsoft.com>

* pass --with-ltcg to configure.py instead of setting variable

Co-authored-by: Kyrylo Hrechykhin <khrechykhin@microsoft.com>

* enable ltcg only on windows

Co-authored-by: Kyrylo Hrechykhin <khrechykhin@microsoft.com>

---------

Co-authored-by: trop[bot] <37223003+trop[bot]@users.noreply.github.com>
Co-authored-by: Kyrylo Hrechykhin <khrechykhin@microsoft.com>
Co-authored-by: John Kleinschmidt <jkleinsc@electronjs.org>

script/generate-config-gypi.py

@@ -21,6 +21,10 @@ def run_node_configure(target_cpu):
   # Work around "No acceptable ASM compiler found" error on some System,
   # it breaks nothing since Electron does not use OpenSSL.
   args += ['--openssl-no-asm']
+
+  # Enable whole-program optimization for electron native modules.
+  if sys.platform == "win32":
+    args += ['--with-ltcg']
   subprocess.check_call([sys.executable, configure] + args)
 
 def read_node_config_gypi():