Check for warning flags without no- prefix

config/:
	* warnings.m4 (ACX_PROG_CC_WARNING_OPTS)
	(ACX_PROG_CC_WARNING_ALMOST_PEDANTIC): Run the test without the
	no- prefix.
libdecnumber/:
	* configure: Regenerate.
libiberty/:
	* configure: Regenerate.

2 files changed, 23 insertions, 11 deletions

diff --git a/libdecnumber/ChangeLog b/libdecnumber/ChangeLog
index 8a19499a530..93dfee6d46f 100644
--- a/libdecnumber/ChangeLog
+++ b/libdecnumber/ChangeLog
@@ -1,3 +1,7 @@
+2011-12-19  Andreas Schwab  <schwab@linux-m68k.org>
+
+	* configure: Regenerate.
+
 2011-04-20  Jim Meyering  <meyering@redhat.com>
 
 	* decNumber.c (decNumberFromString): Remove useless
diff --git a/libdecnumber/configure b/libdecnumber/configure
index f69dd4402b0..5032a174f09 100755
--- a/libdecnumber/configure
+++ b/libdecnumber/configure
@@ -3248,9 +3248,15 @@ test -n "$AUTOHEADER" || AUTOHEADER="$MISSING autoheader"
 
 WARN_CFLAGS=
 save_CFLAGS="$CFLAGS"
-for option in -W -Wall -Wwrite-strings -Wstrict-prototypes \
+for real_option in -W -Wall -Wwrite-strings -Wstrict-prototypes \
 			  -Wmissing-prototypes -Wold-style-definition \
 			  -Wmissing-format-attribute -Wcast-qual; do
+  # Do the check with the no- prefix removed since gcc silently
+  # accepts any -Wno-* option on purpose
+  case $real_option in
+    -Wno-*) option=-W`expr $real_option : '-Wno-\(.*\)'` ;;
+    *) option=$real_option ;;
+  esac
   as_acx_Woption=`$as_echo "acx_cv_prog_cc_warning_$option" | $as_tr_sh`
 
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC supports $option" >&5
@@ -3282,20 +3288,22 @@ eval ac_res=\$$as_acx_Woption
 	       { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
 $as_echo "$ac_res" >&6; }
   if test `eval 'as_val=${'$as_acx_Woption'};$as_echo "$as_val"'` = yes; then :
-  WARN_CFLAGS="$WARN_CFLAGS${WARN_CFLAGS:+ }$option"
+  WARN_CFLAGS="$WARN_CFLAGS${WARN_CFLAGS:+ }$real_option"
 fi
   done
 CFLAGS="$save_CFLAGS"
 
 WARN_PEDANTIC=
+# Do the check with the no- prefix removed from the warning options
+# since gcc silently accepts any -Wno-* option on purpose
 if test "$GCC" = yes; then :
-  { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC supports -pedantic -Wno-long-long" >&5
-$as_echo_n "checking whether $CC supports -pedantic -Wno-long-long... " >&6; }
-if test "${acx_cv_prog_cc_pedantic__Wno_long_long+set}" = set; then :
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC supports -pedantic -Wlong-long" >&5
+$as_echo_n "checking whether $CC supports -pedantic -Wlong-long... " >&6; }
+if test "${acx_cv_prog_cc_pedantic__Wlong_long+set}" = set; then :
   $as_echo_n "(cached) " >&6
 else
   save_CFLAGS="$CFLAGS"
-CFLAGS="-pedantic -Wno-long-long"
+CFLAGS="-pedantic -Wlong-long"
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
@@ -3308,16 +3316,16 @@ main ()
 }
 _ACEOF
 if ac_fn_c_try_compile "$LINENO"; then :
-  acx_cv_prog_cc_pedantic__Wno_long_long=yes
+  acx_cv_prog_cc_pedantic__Wlong_long=yes
 else
-  acx_cv_prog_cc_pedantic__Wno_long_long=no
+  acx_cv_prog_cc_pedantic__Wlong_long=no
 fi
 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 CFLAGS="$save_CFLAGS"
 fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $acx_cv_prog_cc_pedantic__Wno_long_long" >&5
-$as_echo "$acx_cv_prog_cc_pedantic__Wno_long_long" >&6; }
-if test $acx_cv_prog_cc_pedantic__Wno_long_long = yes; then :
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $acx_cv_prog_cc_pedantic__Wlong_long" >&5
+$as_echo "$acx_cv_prog_cc_pedantic__Wlong_long" >&6; }
+if test $acx_cv_prog_cc_pedantic__Wlong_long = yes; then :
   WARN_PEDANTIC="$WARN_PEDANTIC${WARN_PEDANTIC:+ }-pedantic -Wno-long-long"
 fi