diff options
Diffstat (limited to 'build-aux/m4')
| -rw-r--r-- | build-aux/m4/l_filesystem.m4 | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/build-aux/m4/l_filesystem.m4 b/build-aux/m4/l_filesystem.m4 new file mode 100644 index 0000000000..ca3a0cd41c --- /dev/null +++ b/build-aux/m4/l_filesystem.m4 @@ -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 +]) |