From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Alexandru Ardelean <alex@shruggie.ro>
Date: Mon, 13 Jul 2026 22:18:27 +0300
Subject: [PATCH] rlm_krb5: assume thread-safety when cross-compiling

The autoconf probe for krb5_is_thread_safe() has no action-if-cross-compiling
argument, so once libkrb5 provides the symbol configure aborts outright with
"cannot run test program while cross compiling".

Add the missing argument: warn that the probe was skipped, and assume
thread-safety, which is correct for all modern krb5 builds.

Signed-off-by: Alexandru Ardelean <alex@shruggie.ro>
---
--- a/src/modules/rlm_krb5/configure
+++ b/src/modules/rlm_krb5/configure
@@ -4004,10 +4004,9 @@ fi
 
 	if test "x$ac_cv_lib_krb5_krb5_is_thread_safe" = xyes; then
 		if test "$cross_compiling" = yes; then :
-  { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
-$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
-as_fn_error $? "cannot run test program while cross compiling
-See \`config.log' for more details" "$LINENO" 5; }
+  { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: cross compiling: not checking" >&5
+$as_echo "$as_me: WARNING: cross compiling: not checking" >&2;}
+			 krb5threadsafe="-DKRB5_IS_THREAD_SAFE"
 else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
--- a/src/modules/rlm_krb5/configure.ac
+++ b/src/modules/rlm_krb5/configure.ac
@@ -143,7 +143,9 @@ if test "$krb5threadsafe" != "no"; then
 	FR_SMART_CHECK_LIB(krb5, krb5_is_thread_safe)
 	if test "x$ac_cv_lib_krb5_krb5_is_thread_safe" = xyes; then
 		AC_RUN_IFELSE([AC_LANG_PROGRAM([[#include <krb5.h>]], [[return krb5_is_thread_safe() ? 0 : 1]])],
-			[krb5threadsafe="-DKRB5_IS_THREAD_SAFE"], [AC_MSG_WARN([[libkrb5 is not threadsafe]])])
+			[krb5threadsafe="-DKRB5_IS_THREAD_SAFE"], [AC_MSG_WARN([[libkrb5 is not threadsafe]])],
+			[AC_MSG_WARN(cross compiling: not checking)
+			 krb5threadsafe="-DKRB5_IS_THREAD_SAFE"])
 	fi
 else
 	krb5threadsafe=""