Upstream status: Adapted from upstream.

From d3d968e5835f449d7ea715f45160db81ea906303 Mon Sep 17 00:00:00 2001
From: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date: Tue, 16 Aug 2022 20:29:54 +0200
Subject: [PATCH] Fix build on GNU/Hurd

There is no path length limitation there, even via pathconf.  But glibc
provides a getcwd function that allocates the buffer dynamically so we can
just leverage that.
---
 include/ghc/filesystem.hpp | 7 +++++++
 1 file changed, 7 insertions(+)

--- a/filesystem/filesystem.hpp.orig	2022-08-11 22:14:32.000000000 +0200
+++ b/filesystem/filesystem.hpp	2023-06-13 07:26:25.310000000 +0200
@@ -4081,6 +4081,13 @@
         return path();
     }
     return path(std::wstring(buffer.get()), path::native_format);
+#elif defined(__GLIBC__)
+    std::unique_ptr<char, decltype(&std::free)> buffer { ::getcwd(NULL, 0), std::free };
+    if (buffer == nullptr) {
+        ec = detail::make_system_error();
+        return path();
+    }
+    return path(buffer.get());
 #else
     size_t pathlen = static_cast<size_t>(std::max(int(::pathconf(".", _PC_PATH_MAX)), int(PATH_MAX)));
     std::unique_ptr<char[]> buffer(new char[pathlen + 1]);
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<div class='path'>path: <a href='/guix/log/?id=2c0cf38f04a2bca6e8057bf934db3d80bf246266'>root</a>/<a href='/guix/log/tests?id=2c0cf38f04a2bca6e8057bf934db3d80bf246266'>tests</a>/<a href='/guix/log/tests/import-git.scm?id=2c0cf38f04a2bca6e8057bf934db3d80bf246266'>import-git.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/tests/import-git.scm?id=2c0cf38f04a2bca6e8057bf934db3d80bf246266&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2023-09-26 17:36:59 +0200'>2023-09-26</span></td><td><a href='/guix/commit/tests/import-git.scm?id=ba21eeb565fe414b3647173068a0f3eadd174c06'>tests: Assume ‘git’ is always available.</a><span class='msg-avail'>...<span class='msg-tooltip'>* tests/channels.scm (gpg+git-available?): Check for ‘gpg-command’
only.
Remove all ‘test-skip’ statements.
* tests/derivations.scm: Likewise.
* tests/git-authenticate.scm: Likewise.
* tests/git.scm: Likewise.
* tests/import-git.scm: Likewise.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-09-18 19:37:45 +0200'>2021-09-18</span></td><td><a href='/guix/commit/tests/import-git.scm?id=59ee10754eddddb99e4a80b9e18aa12ed1b3d77a'>import: Add 'generic-git' updater.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/git.scm (ls-remote-refs): New procedure.
* tests/git.scm ("remote-refs" "remote-refs: only tags"): New tests.
* guix/import/git.scm: New file.
* doc/guix.texi (Invoking guix refresh): Document it.
* tests/import-git.scm: New test file.
* Makefile.am (MODULES, SCM_TESTS): Register the new files.

Co-authored-by: Sarah Morgensen &lt;iskarian@mgsn.dev&gt;
Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Xinglu Chen</td></tr>