--- freem/configure.ac	2025/04/07 23:40:30	1.23
+++ freem/configure.ac	2025/04/10 01:24:38	1.26
@@ -1,5 +1,5 @@
 #
-#   $Id: configure.ac,v 1.23 2025/04/07 23:40:30 snw Exp $
+#   $Id: configure.ac,v 1.26 2025/04/10 01:24:38 snw Exp $
 #    autoconf rules for FreeM
 #
 #  
@@ -24,6 +24,15 @@
 #   along with FreeM.  If not, see <https://www.gnu.org/licenses/>.
 #
 #   $Log: configure.ac,v $
+#   Revision 1.26  2025/04/10 01:24:38  snw
+#   Remove C++ style comments
+#
+#   Revision 1.25  2025/04/09 21:10:14  snw
+#   Only use -Wno-format-truncation et al when the compiler supports them
+#
+#   Revision 1.24  2025/04/09 20:06:02  snw
+#   Add macros to check for compiler flags to suppress unavoidable warnings
+#
 #   Revision 1.23  2025/04/07 23:40:30  snw
 #   Move to 0.64.0-rc0 and prepare to optimize global file lookup
 #
@@ -91,6 +100,9 @@ AC_CONFIG_HEADERS([src/config.h])
 AC_CONFIG_MACRO_DIR([m4])
 
 AX_LIB_READLINE
+AX_CHECK_COMPILE_FLAG([-Wno-format-truncation], [AX_APPEND_FLAG([-Wno-format-truncation])])
+AX_CHECK_COMPILE_FLAG([-Wno-format-contains-nul], [AX_APPEND_FLAG([-Wno-format-contains-nul])])
+AX_CHECK_COMPILE_FLAG([-Wno-stringop-truncation], [AX_APPEND_FLAG([-Wno-stringop-truncation])])
 
 # check for libm
 AC_CHECK_LIB([m], [powf])