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build: add support for std::filesystem

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Add a macro to check if linking with -lstdc++fs or -lc++fs is required.
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fanquake 2021-06-28 16:00:06 +08:00
parent c194293883
commit ffc89d1f21
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2 changed files with 50 additions and 0 deletions
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47
build-aux/m4/l_filesystem.m4 Normal file
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@ -0,0 +1,47 @@
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
# Clang 8.0.0 (libc++) and earlier requires -lc++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])
SAVED_LIBS="$LIBS"
LIBS="$SAVED_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_RESULT([no])
AC_MSG_CHECKING([whether std::filesystem needs -lc++fs])
LIBS="$SAVED_LIBS -lc++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
])

3
configure.ac
View file

@ -83,6 +83,9 @@ AX_CXX_COMPILE_STDCXX([17], [noext], [mandatory])
dnl Check if -latomic is required for <std::atomic> dnl Check if -latomic is required for <std::atomic>
CHECK_ATOMIC CHECK_ATOMIC
dnl check if additional link flags are required for std::filesystem
CHECK_FILESYSTEM
dnl Unless the user specified OBJCXX, force it to be the same as CXX. This ensures dnl Unless the user specified OBJCXX, force it to be the same as CXX. This ensures
dnl that we get the same -std flags for both. dnl that we get the same -std flags for both.
m4_ifdef([AC_PROG_OBJCXX],[ m4_ifdef([AC_PROG_OBJCXX],[