Remove setting a default value for use_custom_libcxx

Update the .gn to remove forcing use_custom_libcxx = false. Instead, let //build/config/c++/c++.gni determine the value, which should better match Chromium. In particular, this helps with Abseil integration by supporting Windows component builds by better matching the contents of the .def files. Bug: angleproject:4873 Test: CQ Change-Id: If8c064f16459292bfb95113a4d78e14e8923f86f Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2414739Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Tim Van Patten <timvp@google.com>

Remove setting a default value for use_custom_libcxx
a42a7f06 · Tim Van Patten · Commit Bot · d79db259 · a42a7f06 · a42a7f06
Commit a42a7f06 authored Sep 16, 2020 by Tim Van Patten Committed by Commit Bot Sep 19, 2020
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.gn .gn +0 -1

export_targets.py scripts/export_targets.py +1 -0

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--- a/.gn
+++ b/.gn
@@ -33,7 +33,6 @@ exec_script_whitelist = angle_dotfile_settings.exec_script_whitelist +
                        ]
 default_args = {
-  use_custom_libcxx = false
  clang_use_chrome_plugins = true
  build_angle_deqp_tests = true
  use_sysroot = true

--- a/scripts/export_targets.py
+++ b/scripts/export_targets.py
@@ -242,6 +242,7 @@ IGNORED_INCLUDE_PREFIXES = {
 }
 IGNORED_DIRECTORIES = {
+    '//buildtools/third_party/libc++',
    '//third_party/SwiftShader',
    '//third_party/zlib',
 }