That didn't work, so try this awk command from Robert Elz.

[nmh] / configure.ac

diff --git a/configure.ac b/configure.ac
index 4d6e59dcb065b6d305cdda3fe5d3828a503f95cf..520c8d42dbdcb44850feaeac9b2a5bd38dd18fde 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -93,8 +93,7 @@ dnl ------------------
 dnl We want these before the checks,
 dnl so the checks can modify their values.
 test -z "$CFLAGS" && CFLAGS= auto_cflags=1
-dnl TEMPORARILY ENABLE DEBUG
-if test x"$enable_debug" = x""; then
+if test x"$enable_debug" = x"yes"; then
   test -z "$LDFLAGS" && LDFLAGS=-g
 fi
 
@@ -122,6 +121,20 @@ if test "$GCC" = yes; then
        [nmh_cv_has_dash_ansi=no])
      CPPFLAGS="$nmh_saved_cppflags"
      CFLAGS="$nmh_saved_cflags"])
+
+  dnl Disable clang complaint about unused -ansi when linking.
+  AC_CACHE_CHECK([whether linker supports -Qunused-arguments],
+                 [nmh_cv_has_q_unused_arguments],
+    [nmh_saved_ldflags="$LDFLAGS"
+     LDFLAGS="$LDFLAGS -Qunused-arguments"
+     AC_TRY_LINK([],[],nmh_cv_has_q_unused_arguments=yes,
+                 nmh_cv_has_q_unused_arguments=no)
+     LDFLAGS="$nmh_saved_ldflags"])
+
+  if test "$nmh_cv_has_q_unused_arguments" = "yes"; then
+    test -z "$LDFLAGS" && LDFLAGS=-Qunused-arguments \
+                       || LDFLAGS="$LDFLAGS -Qunused-arguments"
+  fi
 else
   nmh_cv_has_dash_ansi=no
 fi
@@ -144,8 +157,7 @@ if test "$nmh_cv_has_wextra" = "yes"; then
 fi
 
 if test -n "$auto_cflags"; then
-  dnl TEMPORARILY ENABLE DEBUG
-  if test x"$enable_debug" = x""; then
+  if test x"$enable_debug" = x"yes"; then
     if test -n "$GCC"; then
       test -z "$CFLAGS" && CFLAGS="$nmh_gcc_warnflags -g" || CFLAGS="$CFLAGS $nmh_gcc_warnflags -g"
     else