git: 296c05f7212c - main - libutil++: Include <cerrno> in stringf.cc

The branch main has been updated by fuz:

URL: https://cgit.FreeBSD.org/src/commit/?id=296c05f7212c37bd6e6bf7e42af11d42a275d493

commit 296c05f7212c37bd6e6bf7e42af11d42a275d493
Author:     Faraz Vahedi <kfv@kfv.io>
AuthorDate: 2026-05-11 06:05:18 +0000
Commit:     Robert Clausecker <fuz@FreeBSD.org>
CommitDate: 2026-08-02 11:17:45 +0000

    libutil++: Include <cerrno> in stringf.cc
    
    stringf.cc uses errno and related macros without including <cerrno>.
    
    Their availability is guaranteed only when the corresponding header
    is included; transitive exposure is implementation-defined.
    
    Modern libc++ has been progressively reducing incidental transitive
    includes as part of its header removal policy (see LLVM libc++ Header
    Removal Policy and D132284), making such dependencies brittle.
    
    This change includes <cerrno> explicitly to make the dependency
    well-defined. No functional or behavioural change intended.
    
    Approved by:    fuz
    Signed-off-by:  Faraz Vahedi <kfv@kfv.io>
    Pull-Request:   https://github.com/freebsd/freebsd-src/pull/2188
---
 lib/libutil++/libutil++.hh | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/libutil++/libutil++.hh b/lib/libutil++/libutil++.hh
index 60e6b3fc5fde..3ba46ed5c506 100644
--- a/lib/libutil++/libutil++.hh
+++ b/lib/libutil++/libutil++.hh
@@ -13,6 +13,7 @@
 #include <netdb.h>
 #include <unistd.h>
 
+#include <cerrno>
 #include <cstdarg>
 #include <cstdio>
 #include <cstdlib>