src: compress ICU data into a shared cache file

BUILDING.md

@@ -923,6 +923,10 @@ This is the default option.
 ./configure --with-intl=full-icu
 ```
 
+`--with-icu-compress` stores that data file compressed. The first run
+unpacks it into the temp directory and maps the result, so later
+processes share those pages. It is off unless a packager opts in.
+
 #### Windows
 
 ```powershell

configure.py

@@ -1002,6 +1002,15 @@
         'the icu4c source archive. '
         f"v{icu_versions['minimum_icu']}.x or later recommended.")
 
+intl_optgroup.add_argument('--with-icu-compress',
+    action='store_true',
+    dest='with_icu_compress',
+    default=False,
+    help='Compress bundled ICU data and map a per-user cache file at runtime. '
+         'Off by default. Packagers opt in when a smaller on-disk binary is '
+         'worth the first-launch unpack. Requires --with-intl=full-icu or '
+         'small-icu.')
+
 intl_optgroup.add_argument('--with-icu-default-data-dir',
     action='store',
     dest='with_icu_default_data_dir',
@@ -2544,11 +2553,15 @@ def icu_download(path):
   # always set icu_small, node.gyp depends on it being defined.
   o['variables']['icu_small'] = b(False)
   o['variables']['icu_system'] = b(False)
+  # Off unless a packager passes --with-icu-compress.
+  o['variables']['icu_compress_data'] = b(False)
 
   # prevent data override
   o['defines'] += ['ICU_NO_USER_DATA_OVERRIDE']
 
   with_intl = options.with_intl
+  if options.with_icu_compress and with_intl not in ('small-icu', 'full-icu'):
+    error('--with-icu-compress requires --with-intl=full-icu or small-icu')
   with_icu_source = options.with_icu_source
   have_icu_path = bool(options.with_icu_path)
   if have_icu_path and with_intl != 'none':
@@ -2603,6 +2616,9 @@ def icu_download(path):
     o['variables']['icu_gyp_path'] = 'tools/icu/icu-system.gyp'
     return
 
+  if options.with_icu_compress:
+    o['variables']['icu_compress_data'] = b(True)
+
   # this is just the 'deps' dir. Used for unpacking.
   icu_parent_path = 'deps'
 

deps/zstd/zstd.gyp

@@ -100,7 +100,16 @@
       ],
       'sources': [
         '<@(zstd_sources)',
-      ]
-    }
+      ],
+      'toolsets': ['host', 'target'],
+    },
+    {
+      'target_name': 'zstd_compress',
+      'type': 'executable',
+      'toolsets': ['host'],
+      'dependencies': ['zstd#host'],
+      'include_dirs': ['lib'],
+      'sources': ['../../tools/zstd_compress.cc'],
+    },
   ]
 }

node.gyp

@@ -185,6 +185,8 @@
       'src/node_watchdog.cc',
       'src/node_worker.cc',
       'src/node_zlib.cc',
+      'src/zstd_blob.cc',
+      'src/zstd_blob.h',
       'src/path.cc',
       'src/permission/fs_permission.cc',
       'src/permission/permission.cc',
@@ -659,6 +661,23 @@
             'WARNING_CFLAGS': [ '-Werror' ],
           },
         }],
+        # The Release executable's local symbol table and STABS dominate
+        # LINKEDIT. -x drops local symbols and -S drops STABS. Debug keeps
+        # them. Do not pass -dead_strip: N-API and libuv symbols are reached
+        # only from addons loaded at runtime, and dead-stripping removes
+        # those exports from the executable.
+        ['OS=="mac" or OS=="ios"', {
+          'configurations': {
+            'Release': {
+              'xcode_settings': {
+                'OTHER_LDFLAGS': [
+                  '-Wl,-x',
+                  '-Wl,-S',
+                ],
+              },
+            },
+          },
+        }],
         ['node_shared=="true" and OS=="win"', {
           'dependencies': ['generate_node_def'],
           'msvs_settings': {
@@ -901,6 +920,9 @@
       'msvs_disabled_warnings!': [4244],
 
       'conditions': [
+        [ 'icu_compress_data=="true"', {
+          'defines': [ 'NODE_HAVE_EMBEDDED_ICU_ZSTD=1' ],
+        }],
         [ 'openssl_default_cipher_list!=""', {
           'defines': [
             'NODE_OPENSSL_DEFAULT_CIPHER_LIST="<(openssl_default_cipher_list)"'
@@ -1671,6 +1693,9 @@
         [ 'node_shared_libuv=="false"', {
           'dependencies': [ 'deps/uv/uv.gyp:libuv#host' ],
         }],
+        [ 'node_shared_zstd=="false"', {
+          'dependencies': [ 'deps/zstd/zstd.gyp:zstd#host' ],
+        }],
         [ 'OS in "linux mac openharmony"', {
           'defines': ['NODE_JS2C_USE_STRING_LITERALS'],
         }],