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build: Bump minimum supported GCC to g++-9

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Also, update the code to use constexpr, which does not work in g++-8.

Also, drop the no longer needed build-aux/m4/l_filesystem.m4.
This commit is contained in:
MarcoFalke
2023-05-15 15:03:30 +02:00
parent fa69955e74
commit fa953f15bf
6 changed files with 5 additions and 47 deletions
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38
build-aux/m4/l_filesystem.m4
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@@ -1,38 +0,0 @@
dnl Copyright (c) 2022 The Bitcoin Core developers
dnl Distributed under the MIT software license, see the accompanying
dnl file COPYING or http://www.opensource.org/licenses/mit-license.php.
# GCC 8.1 and earlier requires -lstdc++fs
m4_define([_CHECK_FILESYSTEM_testbody], [[
#include <filesystem>
namespace fs = std::filesystem;
int main() {
(void)fs::current_path().root_name();
return 0;
}
]])
AC_DEFUN([CHECK_FILESYSTEM], [
AC_LANG_PUSH(C++)
AC_MSG_CHECKING([whether std::filesystem can be used without link library])
AC_LINK_IFELSE([AC_LANG_SOURCE([_CHECK_FILESYSTEM_testbody])],[
AC_MSG_RESULT([yes])
],[
AC_MSG_RESULT([no])
LIBS="$LIBS -lstdc++fs"
AC_MSG_CHECKING([whether std::filesystem needs -lstdc++fs])
AC_LINK_IFELSE([AC_LANG_SOURCE([_CHECK_FILESYSTEM_testbody])],[
AC_MSG_RESULT([yes])
],[
AC_MSG_FAILURE([cannot figure out how to use std::filesystem])
])
])
AC_LANG_POP
])