https://gn-review.googlesource.com/c/gn/+/18760 (partially, at least)
From: Matt Jolly <kangie@gentoo.org>
Date: Sat, 17 May 2025 12:38:19 +1000
Subject: [PATCH] Update patch to v8

--- a/build/gen.py
+++ b/build/gen.py
@@ -432,10 +432,10 @@ def WriteGNNinja(path, platform, host, options, args_list):
         cflags.extend(['-D_LIBCPP_DEBUG=1', '-D_GLIBCXX_DEBUG=1'])
     else:
       cflags.append('-DNDEBUG')
-      cflags.append('-O3')
-      if options.no_strip:
-        cflags.append('-g')
-      ldflags.append('-O3')
+#      cflags.append('-O3')
+#      if options.no_strip:
+#        cflags.append('-g')
+#      ldflags.append('-O3')
       # Use -fdata-sections and -ffunction-sections to place each function
       # or data item into its own section so --gc-sections can eliminate any
       # unused functions and data items.
@@ -482,7 +482,6 @@ def WriteGNNinja(path, platform, host, options, args_list):
         '-D_FILE_OFFSET_BITS=64',
         '-D__STDC_CONSTANT_MACROS', '-D__STDC_FORMAT_MACROS',
         '-pthread',
-        '-pipe',
         '-fno-exceptions',
         '-fno-rtti',
         '-fdiagnostics-color',
@@ -524,8 +524,6 @@
         '-Wno-implicit-fallthrough',
         '-Wno-redundant-move',
         '-Wno-unused-variable',
-        '-Wno-format',             # Use of %llx, which is supported by _UCRT, false positive
-        '-Wno-strict-aliasing',    # Dereferencing punned pointer
         '-Wno-cast-function-type', # Casting FARPROC to RegDeleteKeyExPtr
       ])