diff options
| -rw-r--r-- | build-aux/m4/l_filesystem.m4 | 47 | ||||
| -rw-r--r-- | configure.ac | 3 |
2 files changed, 50 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 +]) diff --git a/configure.ac b/configure.ac index bef3973996..5db104f0d6 100644 --- a/configure.ac +++ b/configure.ac @@ -83,6 +83,9 @@ AX_CXX_COMPILE_STDCXX([17], [noext], [mandatory]) dnl Check if -latomic is required for <std::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 that we get the same -std flags for both. m4_ifdef([AC_PROG_OBJCXX],[ |