tweak warning flags

Enable -Wextra if compiler supports it

Set -Wno-error=format-truncation if available to prevent expected
string truncations in openbsd-compat from breaking -Werror builds

1 files changed, 3 insertions, 1 deletions

diff --git a/configure.ac b/configure.ac
index 8c6c4637c..3e93c0276 100644
--- a/configure.ac
+++ b/configure.ac
@@ -152,9 +152,11 @@ CFLAGS="$saved_CFLAGS"
 
 if test "$GCC" = "yes" || test "$GCC" = "egcs"; then
         OSSH_CHECK_CFLAG_COMPILE([-pipe])
-        OSSH_CHECK_CFLAG_COMPILE([-Qunused-arguments])
         OSSH_CHECK_CFLAG_COMPILE([-Wunknown-warning-option])
+        OSSH_CHECK_CFLAG_COMPILE([-Wno-error=format-truncation])
+        OSSH_CHECK_CFLAG_COMPILE([-Qunused-arguments])
         OSSH_CHECK_CFLAG_COMPILE([-Wall])
+        OSSH_CHECK_CFLAG_COMPILE([-Wextra])
         OSSH_CHECK_CFLAG_COMPILE([-Wpointer-arith])
         OSSH_CHECK_CFLAG_COMPILE([-Wuninitialized])
         OSSH_CHECK_CFLAG_COMPILE([-Wsign-compare])