From 6de08cb5b0602f7786bc1daabc6b7f460cfd542b Mon Sep 17 00:00:00 2001
From: Jan Wielemaker <jan@swi-prolog.org>
Date: Tue, 3 Dec 2024 10:53:15 +0100
Subject: [PATCH] PORT: Make cmake test for signal handler compatible with c23

---
 cmake/TestSignalType.c |  6 +++---
 scripts/configure      | 10 ++++++++++
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/cmake/TestSignalType.c b/cmake/TestSignalType.c
index aca0bf4ed6..4d2d081b9c 100644
--- a/cmake/TestSignalType.c
+++ b/cmake/TestSignalType.c
@@ -4,13 +4,13 @@
 # undef signal
 #endif
 #ifdef __cplusplus
-extern "C" void (*signal (int, void (*)(int)))(int);
+extern "C"
 #else
-void (*signal ()) ();
+void ( *signal(int signum, void (*handler)(int)) ) (int);
 #endif
 
 int
-main ()
+main(int argc, char **argv)
 {
   return 0;
 }
diff --git a/scripts/configure b/scripts/configure
index 5da09dab3a..e52ec58e81 100755
--- a/scripts/configure
+++ b/scripts/configure
@@ -94,6 +94,16 @@ case $config in
     ;;
 esac
 
+# c23
+#
+# Enable C23 mode
+
+case $config in
+  *c23*)
+    CFLAGS+=" -std=gnu23"
+    ;;
+esac
+
 # test
 #
 # Install the  tests along  with the  executable.  Allows  running the