From ea381bac43f3ce78be5fa3ea10810810670dfb89 Mon Sep 17 00:00:00 2001
From: peter <peter@pmikkelsen.com>
Date: Tue, 22 Sep 2026 18:26:55 +0000
Subject: Check for flexible array member support via autoconf

FossilOrigin-Name: 4d8f080ee14f63ea5cb2c0aa87be1519e7b74e3c42de2370e90ae1e1f9268cd0
---
 configure | 50 +++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 49 insertions(+), 1 deletion(-)

(limited to 'configure')

diff --git a/configure b/configure
index 4727c37..9ea8331 100755
--- a/configure
+++ b/configure
@@ -4488,6 +4488,55 @@ else
 fi
 
 
+
+
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for flexible array members" >&5
+printf %s "checking for flexible array members... " >&6; }
+if test ${ac_cv_c_flexmember+y}
+then :
+  printf %s "(cached) " >&6
+else case e in #(
+  e) cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <stdlib.h>
+	    #include <stdio.h>
+	    #include <stddef.h>
+	    struct s { int n; double d[]; };
+int
+main (void)
+{
+int m = getchar ();
+	    struct s *p = (struct s *) malloc (offsetof (struct s, d)
+					       + m * sizeof (double));
+	    p->d[0] = 0.0;
+	    m = p->d != (double *) NULL;
+	    free (p);
+	    return m;
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"
+then :
+  ac_cv_c_flexmember=yes
+else case e in #(
+  e) ac_cv_c_flexmember=no ;;
+esac
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext ;;
+esac
+fi
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_c_flexmember" >&5
+printf "%s\n" "$ac_cv_c_flexmember" >&6; }
+  if test $ac_cv_c_flexmember = yes; then
+
+printf "%s\n" "#define FLEXIBLE_ARRAY_MEMBER /**/" >>confdefs.h
+
+  else
+    printf "%s\n" "#define FLEXIBLE_ARRAY_MEMBER 1" >>confdefs.h
+
+  fi
+
 if test -n "$ac_tool_prefix"; then
   # Extract the first word of "${ac_tool_prefix}ranlib", so it can be a program name with args.
 set dummy ${ac_tool_prefix}ranlib; ac_word=$2
@@ -4593,7 +4642,6 @@ else
 fi
 
 
-
   if test -n "$ac_tool_prefix"; then
   for ac_prog in ar lib "link -lib"
   do
-- 
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