From 5c0244625f18d48a121882c7e1a47444a5a86a50 Mon Sep 17 00:00:00 2001
From: Denis <denis@debian.systeme-solaire.espace>
Date: Tue, 15 Oct 2024 19:12:58 +0200
Subject: [PATCH] adding for_autoconf() C function for autoconf AC_CHECK_LIB
 feature

---
 src/libdar/get_version.cpp |  9 +++++++++
 src/libdar/get_version.hpp | 10 ++++++++++
 2 files changed, 19 insertions(+)

diff --git a/src/libdar/get_version.cpp b/src/libdar/get_version.cpp
index c9071672..bd63249a 100644
--- a/src/libdar/get_version.cpp
+++ b/src/libdar/get_version.cpp
@@ -287,3 +287,12 @@ namespace libdar
 
 
 } // end of namespace
+
+extern "C"
+{
+    unsigned int for_autoconf(unsigned int x)
+    {
+        return x+1;
+    }
+}
+
diff --git a/src/libdar/get_version.hpp b/src/libdar/get_version.hpp
index f618c548..5c2415d5 100644
--- a/src/libdar/get_version.hpp
+++ b/src/libdar/get_version.hpp
@@ -149,4 +149,14 @@ namespace libdar
 
 } // end of namespace
 
+extern "C"
+{
+        /// in case you use autoconf AC_CHECK_LIB in your program to detect the availability of libdar
+
+        /// use AC_CHECK_LIB(dar, [for_autoconf], [], [])
+        /// to have autoconf based configure script properly detecting
+        /// the presence and usability of libthreadar
+    extern unsigned int for_autoconf(unsigned int x);
+}
+
 #endif