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From: Maciej Cencora <m.cencora@gmail.com>
Date: Fri, 27 Jan 2023 21:44:21 +0100
Message-ID: <CAPFqmUq6ToGT1m1LhOA1T9U+i2h+m7Eg_sJEr=GzCPXKwiFcNQ@mail.gmail.com>
Subject: [PATCH] tree: Fix up tree_code_{length,type}
To: gcc-patches@gcc.gnu.org
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List-Id: <gcc-patches.gcc.gnu.org>

Hi,

you can emulate C++17 inline variables in C++11 with either of the two ways:

1) via a template helper
template <typename = void>
struct Helper
{
    static constexpr unsigned value[4] = {1, 2, 3, 4};
};

template <typename T>
constexpr unsigned Helper<T>::value[4];

static constexpr auto& arr = Helper<>::value;

2) extern constexpr + weak attribute
[[gnu::weak]] extern constexpr unsigned arr[] = {1, 2, 3, 4};

Regards,
Maciej