From c33e832cc145c696d2157796c7640e659740dafa Mon Sep 17 00:00:00 2001
From: Raphael Kubo da Costa <raphael.kubo.da.costa@intel.com>
Date: Fri, 8 Feb 2019 08:44:00 +0000
Subject: [PATCH] quic_flags_impl: Fix GCC build after #618558
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Due to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84849, having
base::NoDestructor<T<U>> and passing an initializer list of Us does not
work if this is not done explicitly, as GCC incorrectly fails to determine
which constructor overload to use:

    ../../net/third_party/quic/platform/impl/quic_flags_impl.cc: In member function ‘bool quic::TypedQuicFlagHelper<T>::SetFlag(const string&) const [with T = bool; std::__cxx11::string = std::__cxx11::basic_string<char>]’:
    ../../net/third_party/quic/platform/impl/quic_flags_impl.cc:156:41: error: call of overloaded ‘NoDestructor(<brace-enclosed initializer list>)’ is ambiguous
           {"", "1", "t", "true", "y", "yes"});
                                         ^
    In file included from ../../net/third_party/quic/platform/impl/quic_flags_impl.h:16,
                     from ../../net/third_party/quic/platform/impl/quic_flags_impl.cc:5:
    ../../base/no_destructor.h:62:3: note: candidate: ‘base::NoDestructor<T>::NoDestructor(const base::NoDestructor<T>&) [with T = std::set<std::__cxx11::basic_string<char> >]’ <deleted>
       NoDestructor(const NoDestructor&) = delete;
       ^~~~~~~~~~~~
    ../../base/no_destructor.h:60:12: note: candidate: ‘base::NoDestructor<T>::NoDestructor(T&&) [with T = std::set<std::__cxx11::basic_string<char> >]’
       explicit NoDestructor(T&& x) { new (storage_) T(std::move(x)); }
                ^~~~~~~~~~~~
    ../../base/no_destructor.h:59:12: note: candidate: ‘base::NoDestructor<T>::NoDestructor(const T&) [with T = std::set<std::__cxx11::basic_string<char> >]’
       explicit NoDestructor(const T& x) { new (storage_) T(x); }
                ^~~~~~~~~~~~

Explicitly use an std::initializer_list to make the build work everywhere.

Bug: 819294
Change-Id: I775be20e3766a88a656b58c94c40869cb1bee2a8
Reviewed-on: https://chromium-review.googlesource.com/c/1458214
Auto-Submit: Raphael Kubo da Costa <raphael.kubo.da.costa@intel.com>
Reviewed-by: Ryan Hamilton <rch@chromium.org>
Commit-Queue: Raphael Kubo da Costa <raphael.kubo.da.costa@intel.com>
Cr-Commit-Position: refs/heads/master@{#630249}
---
 net/third_party/quic/platform/impl/quic_flags_impl.cc | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/net/third_party/quic/platform/impl/quic_flags_impl.cc b/net/third_party/quic/platform/impl/quic_flags_impl.cc
index 5e6962d1e770..3fa45fc6892d 100644
--- ./net/third_party/quic/platform/impl/quic_flags_impl.cc
+++ ./net/third_party/quic/platform/impl/quic_flags_impl.cc
@@ -5,6 +5,7 @@
 #include "net/third_party/quic/platform/impl/quic_flags_impl.h"
 
 #include <algorithm>
+#include <initializer_list>
 #include <iostream>
 #include <set>
 
@@ -153,9 +154,9 @@ std::string QuicFlagRegistry::GetHelp() const {
 template <>
 bool TypedQuicFlagHelper<bool>::SetFlag(const std::string& s) const {
   static const base::NoDestructor<std::set<std::string>> kTrueValues(
-      {"", "1", "t", "true", "y", "yes"});
+      std::initializer_list<std::string>({"", "1", "t", "true", "y", "yes"}));
   static const base::NoDestructor<std::set<std::string>> kFalseValues(
-      {"0", "f", "false", "n", "no"});
+      std::initializer_list<std::string>({"0", "f", "false", "n", "no"}));
   if (kTrueValues->find(base::ToLowerASCII(s)) != kTrueValues->end()) {
     *flag_ = true;
     return true;
-- 
2.20.1