[build] Build the standard c++ library from source.

This allows it to be instrumented by the sanitizers. Enabled only for MSAN and for Android. Don't pick up Flutter's including no_exceptions in the default config set. TEST=ci Bug: #44312 Bug: #44377 Bug: #43075 Bug: #50248 Bug: #50271 Bug: #52441 Change-Id: If01704ff29569fba8f8181ed31d52faba8d8370f Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/304824 Reviewed-by: Alexander Aprelev <[email protected]> Commit-Queue: Ryan Macnak <[email protected]>
dart-lang · May 22, 2023 · ddc11f8 · ddc11f8
1 parent c3e815b
commit ddc11f8
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Showing 11 changed files with 387 additions and 16 deletions.
diff --git a/DEPS b/DEPS
@@ -19,6 +19,7 @@ allowed_hosts = [
   'dart.googlesource.com',
   'dart-internal.googlesource.com',
   'fuchsia.googlesource.com',
+  'llvm.googlesource.com',
 ]
 
 vars = {
@@ -42,6 +43,7 @@ vars = {
   # Chromium git
   "chromium_git": "https://chromium.googlesource.com",
   "fuchsia_git": "https://fuchsia.googlesource.com",
+  "llvm_git": "https://llvm.googlesource.com",
 
   # Checked-in SDK version. The checked-in SDK is a Dart SDK distribution in a
   # cipd package used to run Dart scripts in the build and test infrastructure,
@@ -95,6 +97,8 @@ vars = {
   "devtools_rev": "026f0adf03725fbab24d601ac74c811808f258e5",
   "icu_rev": "81d656878ec611cb0b42d52c82e9dae93920d9ba",
   "jinja2_rev": "2222b31554f03e62600cd7e383376a7c187967a1",
+  "libcxx_rev": "44079a4cc04cdeffb9cfe8067bfb3c276fb2bab0",
+  "libcxxabi_rev": "2ce528fb5e0f92e57c97ec3ff53b75359d33af12",
   "libprotobuf_rev": "24487dd1045c7f3d64a21f38a3f0c06cc4cf2edb",
   "markupsafe_rev": "8f45f5cfa0009d2a70589bcda0349b8cb2b72783",
   "perfetto_rev": "b8da07095979310818f0efde2ef3c69ea70d62c5",
@@ -275,6 +279,12 @@ deps = {
       Var("chromium_git") + "/chromium/src/third_party/zlib.git" +
       "@" + Var("zlib_rev"),
 
+  Var("dart_root") + "/third_party/libcxx":
+      Var("llvm_git") + "/llvm-project/libcxx" + "@" + Var("libcxx_rev"),
+
+  Var("dart_root") + "/third_party/libcxxabi":
+      Var("llvm_git") + "/llvm-project/libcxxabi" + "@" + Var("libcxxabi_rev"),
+
   Var("dart_root") + "/third_party/boringssl":
       Var("dart_git") + "boringssl_gen.git" + "@" + Var("boringssl_gen_rev"),
   Var("dart_root") + "/third_party/boringssl/src":

diff --git a/build/config/BUILDCONFIG.gn b/build/config/BUILDCONFIG.gn
@@ -222,6 +222,8 @@ if (!is_clang && (is_asan || is_lsan || is_msan || is_tsan || is_ubsan)) {
   is_clang = true
 }
 
+use_flutter_cxx = is_msan || is_android
+
 # =============================================================================
 # TARGET DEFAULTS
 # =============================================================================
@@ -235,6 +237,7 @@ if (!is_clang && (is_asan || is_lsan || is_msan || is_tsan || is_ubsan)) {
 # duplication in each target below.
 _native_compiler_configs = [
   "//build/config/compiler:compiler",
+  "//build/config/compiler:cxx_version_default",
   "//build/config/compiler:clang_stackrealign",
   "//build/config/compiler:compiler_arm_fpu",
   "//build/config/compiler:compiler_arm_thumb",
@@ -243,6 +246,14 @@ _native_compiler_configs = [
   "//build/config/compiler:no_rtti",
   "//build/config/compiler:runtime_library",
 ]
+
+if (use_flutter_cxx) {
+  _native_compiler_configs += [
+    "//third_party/libcxxabi:libcxxabi_config",
+    "//third_party/libcxx:libcxx_config",
+  ]
+}
+
 if (is_win) {
   _native_compiler_configs += [
     "//build/config/win:lean_and_mean",
@@ -419,6 +430,31 @@ if (is_win) {
   }
 }
 
+# Sets default dependencies for executable and shared_library targets.
+#
+# Variables
+#   no_default_deps: If true, no standard dependencies will be added.
+if (use_flutter_cxx) {
+  foreach(_target_type,
+          [
+            "executable",
+            "loadable_module",
+            "shared_library",
+          ]) {
+    template(_target_type) {
+      target(_target_type, target_name) {
+        forward_variables_from(invoker, "*", [ "no_default_deps" ])
+        if (!defined(deps)) {
+          deps = []
+        }
+        if (!defined(invoker.no_default_deps) || !invoker.no_default_deps) {
+          deps += [ "//third_party/libcxx" ]
+        }
+      }
+    }
+  }
+}
+
 # ==============================================================================
 # COMPONENT SETUP
 # ==============================================================================

diff --git a/build/config/c++/c++.gni b/build/config/c++/c++.gni
@@ -0,0 +1,9 @@
+# Copyright 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+declare_args() {
+  # Use libc++ (buildtools/third_party/libc++ and
+  # buildtools/third_party/libc++abi) instead of stdlibc++ as standard library.
+  use_custom_libcxx = false
+}
diff --git a/build/config/compiler/BUILD.gn b/build/config/compiler/BUILD.gn
@@ -23,6 +23,7 @@ if (is_win) {
   import("//build/config/win/visual_studio_version.gni")
 }
 
+import("//build/config/c++/c++.gni")
 import("//build/toolchain/ccache.gni")
 
 # default_include_dirs ---------------------------------------------------------
@@ -135,6 +136,14 @@ config("compiler") {
       cflags += [ "-fsanitize=undefined" ]
       ldflags += [ "-fsanitize=undefined" ]
     }
+
+    if (use_custom_libcxx) {
+      cflags_cc += [ "-nostdinc++" ]
+      include_dirs = [
+        "//buildtools/third_party/libc++/trunk/include",
+        "//buildtools/third_party/libc++abi/trunk/include",
+      ]
+    }
   }
 
   if (is_clang && is_debug) {
@@ -250,8 +259,19 @@ config("compiler") {
   }
 
   if (is_android || is_linux || is_mac || is_fuchsia) {
-    cflags += [ "-fPIE" ]
-    ldflags += [ "-fPIE" ]
+    if (use_flutter_cxx) {
+      # shared_library_config isn't transitive, so we don't automatically get
+      # another versions of libcxx with and without -fPIC. Properly setting this
+      # up so only shard libraries pay the extra cost fPIC over fPIE means
+      # something like separate GN toolchains like in the Fuchsia GN build. For
+      # now, globally enabling fPIC is okay because it is limited to test-only
+      # builds.
+      cflags += [ "-fPIC" ]
+      ldflags += [ "-fPIC" ]
+    } else {
+      cflags += [ "-fPIE" ]
+      ldflags += [ "-fPIE" ]
+    }
   }
 
   # Linux-specific compiler flags setup.
@@ -418,6 +438,56 @@ config("compiler") {
   }
 }
 
+config("cxx_version_default") {
+  if (is_win) {
+    cc_std = [ "/std:c++17" ]
+  } else {
+    cc_std = [ "-std=c++17" ]
+  }
+  cflags_cc = cc_std
+  cflags_objcc = cc_std
+}
+
+config("cxx_version_11") {
+  if (is_win) {
+    cc_std = [ "/std:c++11" ]
+  } else {
+    cc_std = [ "-std=c++11" ]
+  }
+  cflags_cc = cc_std
+  cflags_objcc = cc_std
+}
+
+config("cxx_version_14") {
+  if (is_win) {
+    cc_std = [ "/std:c++14" ]
+  } else {
+    cc_std = [ "-std=c++14" ]
+  }
+  cflags_cc = cc_std
+  cflags_objcc = cc_std
+}
+
+config("cxx_version_17") {
+  if (is_win) {
+    cc_std = [ "/std:c++17" ]
+  } else {
+    cc_std = [ "-std=c++17" ]
+  }
+  cflags_cc = cc_std
+  cflags_objcc = cc_std
+}
+
+config("cxx_version_20") {
+  if (is_win) {
+    cc_std = [ "/std:c++20" ]
+  } else {
+    cc_std = [ "-std=c++20" ]
+  }
+  cflags_cc = cc_std
+  cflags_objcc = cc_std
+}
+
 # This is separate from :compiler_codegen (and not even a sub-config there)
 # so that some targets can remove it from the list with:
 #   configs -= [ "//build/config/compiler:clang_stackrealign" ]
@@ -462,6 +532,8 @@ config("compiler_arm_thumb") {
 
 config("runtime_library") {
   cflags = []
+  cflags_cc = []
+  cflags_objcc = []
   defines = []
   ldflags = []
   lib_dirs = []
@@ -483,6 +555,16 @@ config("runtime_library") {
     ]
   }
 
+  if (use_flutter_cxx) {
+    cflags_cc += [ "-nostdinc++" ]
+    cflags_objcc += [ "-nostdinc++" ]
+    ldflags += [ "-nostdlib++" ]
+    include_dirs = [
+      "//third_party/libcxx/include",
+      "//third_party/libcxxabi/include",
+    ]
+  }
+
   if (is_linux) {
     libs += [
       "dl",

diff --git a/build/config/linux/BUILD.gn b/build/config/linux/BUILD.gn
@@ -15,10 +15,12 @@ config("sdk") {
 
   # Explicitly use static linking for libstdc++ and libgcc to minimize
   # dependencies.
-  ldflags += [
-    "-static-libgcc",
-    "-static-libstdc++",
-  ]
+  if (!use_flutter_cxx) {
+    ldflags += [
+      "-static-libgcc",
+      "-static-libstdc++",
+    ]
+  }
 
   if (sysroot != "") {
     cflags += [ "--sysroot=" + sysroot ]

diff --git a/build/config/mac/BUILD.gn b/build/config/mac/BUILD.gn
@@ -6,10 +6,12 @@ import("//build/config/sysroot.gni")
 import("../clang/clang.gni")
 
 config("sdk") {
-  ldflags = [
-    "-nostdlib++",
-    "${clang_prefix}/../lib/libc++.a",
-  ]
+  if (!use_flutter_cxx) {
+    ldflags = [
+      "-nostdlib++",
+      "${clang_prefix}/../lib/libc++.a",
+    ]
+  }
 }
 
 # On Mac, this is used for everything except static libraries.

diff --git a/build/config/sanitizers/sanitizers.gni b/build/config/sanitizers/sanitizers.gni
@@ -3,12 +3,6 @@
 # found in the LICENSE file.
 
 declare_args() {
-  # Use libc++ (buildtools/third_party/libc++ and
-  # buildtools/third_party/libc++abi) instead of stdlibc++ as standard library.
-  # This is intended to be used for instrumented builds.
-  use_custom_libcxx =
-      (is_asan && is_linux) || is_lsan || is_msan || is_tsan || is_ubsan
-
   # Track where uninitialized memory originates from. From fastest to slowest:
   # 0 - no tracking, 1 - track only the initial allocation site, 2 - track the
   # chain of stores leading from allocation site to use site.