Add to configure some flags what for now not create any warnings.

2 files changed, 511 insertions, 15 deletions

diff --git a/configure b/configure
index 71ca5bcfb..56938baf9 100755
--- a/configure
+++ b/configure
@@ -1,5 +1,5 @@
 #! /bin/sh
-# From configure.in 98f4fcb.
+# From configure.in 9bd03cf.
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.69.
 #
@@ -4576,16 +4576,14 @@ ac_compiler_gnu=$ac_cv_c_compiler_gnu
 # -Wunsafe-loop-optimizations possible optimisation issues
 # -Wunused-parameter -Wunused-but-set-parameter unused parameters
 # -Wunused-macros unused macro warnings, but it also enable unused parameters
+# -Wstrict-prototypes show warning in grammar.y
 # attributes suggestion
 #  -Wsuggest-attribute=const -Wsuggest-attribute=format -Wsuggest-attribute=pure
 
-# flags what can be used but now return no warnings: -Warray-bounds -Wbool-compare -Wcast-align
-#   -Wchar-subscripts -Wchkp -Wclobbered -Wcomment -Wdisabled-optimization -Wempty-body
-#   -Werror-implicit-function-declaration -Wignored-qualifiers -Wtrampolines -Wtype-limits
-#   -Wjump-misses-init -Wlogical-op  -Wmissing-field-initializers -Wmissing-parameter-type
-#   -Wnested-externs -Wold-style-declaration -Wold-style-definition -Woverlength-strings -Woverride-init
-#   -Wredundant-decls -Wstack-protector -Wstrict-prototypes -Wundef
-#   -Winit-self -Wpointer-arith -Wswitch-bool
+# flags what can be used but now return no warnings:
+#   -Wchkp -Wdisabled-optimization
+#   -Werror-implicit-function-declaration -Wtrampolines
+#   -Wjump-misses-init
 
 CFLAGS="$CFLAGS -pipe -ffast-math -Wall -Wextra -Wno-sign-compare"
 CPPFLAGS="$CPPFLAGS -I../common"
@@ -6228,6 +6226,153 @@ rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 
 
 
+		{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC supports -Winit-self" >&5
+$as_echo_n "checking whether $CC supports -Winit-self... " >&6; }
+		OLD_CFLAGS="$CFLAGS"
+		CFLAGS="$CFLAGS -Werror -Winit-self"
+		cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+int foo;
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+
+				{ $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+				CFLAGS="$OLD_CFLAGS -Winit-self"
+				# Optionally, run a test
+				if test "x" != "x"; then
+					{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC can actually use -Winit-self" >&5
+$as_echo_n "checking whether $CC can actually use -Winit-self... " >&6; }
+					CFLAGS="$OLD_CFLAGS -Werror -Winit-self"
+					cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+
+							{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+							CFLAGS="$OLD_CFLAGS"
+
+
+							{ $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+							CFLAGS="$OLD_CFLAGS -Winit-self"
+
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+				fi
+
+else
+
+				{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+				CFLAGS="$OLD_CFLAGS"
+
+
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+
+
+
+		{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC supports -Wpointer-arith" >&5
+$as_echo_n "checking whether $CC supports -Wpointer-arith... " >&6; }
+		OLD_CFLAGS="$CFLAGS"
+		CFLAGS="$CFLAGS -Werror -Wpointer-arith"
+		cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+int foo;
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+
+				{ $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+				CFLAGS="$OLD_CFLAGS -Wpointer-arith"
+				# Optionally, run a test
+				if test "x" != "x"; then
+					{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC can actually use -Wpointer-arith" >&5
+$as_echo_n "checking whether $CC can actually use -Wpointer-arith... " >&6; }
+					CFLAGS="$OLD_CFLAGS -Werror -Wpointer-arith"
+					cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+
+							{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+							CFLAGS="$OLD_CFLAGS"
+
+
+							{ $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+							CFLAGS="$OLD_CFLAGS -Wpointer-arith"
+
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+				fi
+
+else
+
+				{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+				CFLAGS="$OLD_CFLAGS"
+
+
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+
+
+
+		{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC supports -Wswitch-bool" >&5
+$as_echo_n "checking whether $CC supports -Wswitch-bool... " >&6; }
+		OLD_CFLAGS="$CFLAGS"
+		CFLAGS="$CFLAGS -Werror -Wswitch-bool"
+		cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+int foo;
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+
+				{ $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+				CFLAGS="$OLD_CFLAGS -Wswitch-bool"
+				# Optionally, run a test
+				if test "x" != "x"; then
+					{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC can actually use -Wswitch-bool" >&5
+$as_echo_n "checking whether $CC can actually use -Wswitch-bool... " >&6; }
+					CFLAGS="$OLD_CFLAGS -Werror -Wswitch-bool"
+					cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+
+							{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+							CFLAGS="$OLD_CFLAGS"
+
+
+							{ $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+							CFLAGS="$OLD_CFLAGS -Wswitch-bool"
+
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+				fi
+
+else
+
+				{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+				CFLAGS="$OLD_CFLAGS"
+
+
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+
+
+
 		{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC supports -Wenum-conversion" >&5
 $as_echo_n "checking whether $CC supports -Wenum-conversion... " >&6; }
 		OLD_CFLAGS="$CFLAGS"
@@ -6718,6 +6863,349 @@ rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 
 
 
+		{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC supports -Wundef" >&5
+$as_echo_n "checking whether $CC supports -Wundef... " >&6; }
+		OLD_CFLAGS="$CFLAGS"
+		CFLAGS="$CFLAGS -Werror -Wundef"
+		cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+int foo;
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+
+				{ $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+				CFLAGS="$OLD_CFLAGS -Wundef"
+				# Optionally, run a test
+				if test "x" != "x"; then
+					{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC can actually use -Wundef" >&5
+$as_echo_n "checking whether $CC can actually use -Wundef... " >&6; }
+					CFLAGS="$OLD_CFLAGS -Werror -Wundef"
+					cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+
+							{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+							CFLAGS="$OLD_CFLAGS"
+
+
+							{ $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+							CFLAGS="$OLD_CFLAGS -Wundef"
+
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+				fi
+
+else
+
+				{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+				CFLAGS="$OLD_CFLAGS"
+
+
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+
+
+
+		{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC supports -Wcast-align" >&5
+$as_echo_n "checking whether $CC supports -Wcast-align... " >&6; }
+		OLD_CFLAGS="$CFLAGS"
+		CFLAGS="$CFLAGS -Werror -Wcast-align"
+		cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+int foo;
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+
+				{ $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+				CFLAGS="$OLD_CFLAGS -Wcast-align"
+				# Optionally, run a test
+				if test "x" != "x"; then
+					{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC can actually use -Wcast-align" >&5
+$as_echo_n "checking whether $CC can actually use -Wcast-align... " >&6; }
+					CFLAGS="$OLD_CFLAGS -Werror -Wcast-align"
+					cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+
+							{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+							CFLAGS="$OLD_CFLAGS"
+
+
+							{ $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+							CFLAGS="$OLD_CFLAGS -Wcast-align"
+
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+				fi
+
+else
+
+				{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+				CFLAGS="$OLD_CFLAGS"
+
+
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+
+
+
+		{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC supports -Wlogical-op" >&5
+$as_echo_n "checking whether $CC supports -Wlogical-op... " >&6; }
+		OLD_CFLAGS="$CFLAGS"
+		CFLAGS="$CFLAGS -Werror -Wlogical-op"
+		cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+int foo;
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+
+				{ $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+				CFLAGS="$OLD_CFLAGS -Wlogical-op"
+				# Optionally, run a test
+				if test "x" != "x"; then
+					{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC can actually use -Wlogical-op" >&5
+$as_echo_n "checking whether $CC can actually use -Wlogical-op... " >&6; }
+					CFLAGS="$OLD_CFLAGS -Werror -Wlogical-op"
+					cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+
+							{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+							CFLAGS="$OLD_CFLAGS"
+
+
+							{ $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+							CFLAGS="$OLD_CFLAGS -Wlogical-op"
+
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+				fi
+
+else
+
+				{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+				CFLAGS="$OLD_CFLAGS"
+
+
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+
+
+
+		{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC supports -Wnested-externs" >&5
+$as_echo_n "checking whether $CC supports -Wnested-externs... " >&6; }
+		OLD_CFLAGS="$CFLAGS"
+		CFLAGS="$CFLAGS -Werror -Wnested-externs"
+		cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+int foo;
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+
+				{ $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+				CFLAGS="$OLD_CFLAGS -Wnested-externs"
+				# Optionally, run a test
+				if test "x" != "x"; then
+					{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC can actually use -Wnested-externs" >&5
+$as_echo_n "checking whether $CC can actually use -Wnested-externs... " >&6; }
+					CFLAGS="$OLD_CFLAGS -Werror -Wnested-externs"
+					cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+
+							{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+							CFLAGS="$OLD_CFLAGS"
+
+
+							{ $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+							CFLAGS="$OLD_CFLAGS -Wnested-externs"
+
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+				fi
+
+else
+
+				{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+				CFLAGS="$OLD_CFLAGS"
+
+
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+
+
+
+		{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC supports -Wold-style-definition" >&5
+$as_echo_n "checking whether $CC supports -Wold-style-definition... " >&6; }
+		OLD_CFLAGS="$CFLAGS"
+		CFLAGS="$CFLAGS -Werror -Wold-style-definition"
+		cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+int foo;
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+
+				{ $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+				CFLAGS="$OLD_CFLAGS -Wold-style-definition"
+				# Optionally, run a test
+				if test "x" != "x"; then
+					{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC can actually use -Wold-style-definition" >&5
+$as_echo_n "checking whether $CC can actually use -Wold-style-definition... " >&6; }
+					CFLAGS="$OLD_CFLAGS -Werror -Wold-style-definition"
+					cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+
+							{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+							CFLAGS="$OLD_CFLAGS"
+
+
+							{ $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+							CFLAGS="$OLD_CFLAGS -Wold-style-definition"
+
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+				fi
+
+else
+
+				{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+				CFLAGS="$OLD_CFLAGS"
+
+
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+
+
+
+		{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC supports -Woverlength-strings" >&5
+$as_echo_n "checking whether $CC supports -Woverlength-strings... " >&6; }
+		OLD_CFLAGS="$CFLAGS"
+		CFLAGS="$CFLAGS -Werror -Woverlength-strings"
+		cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+int foo;
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+
+				{ $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+				CFLAGS="$OLD_CFLAGS -Woverlength-strings"
+				# Optionally, run a test
+				if test "x" != "x"; then
+					{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC can actually use -Woverlength-strings" >&5
+$as_echo_n "checking whether $CC can actually use -Woverlength-strings... " >&6; }
+					CFLAGS="$OLD_CFLAGS -Werror -Woverlength-strings"
+					cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+
+							{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+							CFLAGS="$OLD_CFLAGS"
+
+
+							{ $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+							CFLAGS="$OLD_CFLAGS -Woverlength-strings"
+
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+				fi
+
+else
+
+				{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+				CFLAGS="$OLD_CFLAGS"
+
+
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+
+
+
+		{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC supports -Wredundant-decls" >&5
+$as_echo_n "checking whether $CC supports -Wredundant-decls... " >&6; }
+		OLD_CFLAGS="$CFLAGS"
+		CFLAGS="$CFLAGS -Werror -Wredundant-decls"
+		cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+int foo;
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+
+				{ $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+				CFLAGS="$OLD_CFLAGS -Wredundant-decls"
+				# Optionally, run a test
+				if test "x" != "x"; then
+					{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC can actually use -Wredundant-decls" >&5
+$as_echo_n "checking whether $CC can actually use -Wredundant-decls... " >&6; }
+					CFLAGS="$OLD_CFLAGS -Werror -Wredundant-decls"
+					cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+
+							{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+							CFLAGS="$OLD_CFLAGS"
+
+
+							{ $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+							CFLAGS="$OLD_CFLAGS -Wredundant-decls"
+
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+				fi
+
+else
+
+				{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+				CFLAGS="$OLD_CFLAGS"
+
+
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+
+
+
 		{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC supports -Wno-format-nonliteral" >&5
 $as_echo_n "checking whether $CC supports -Wno-format-nonliteral... " >&6; }
 		OLD_CFLAGS="$CFLAGS"
diff --git a/configure.in b/configure.in
index da52bc286..4729c095e 100644
--- a/configure.in
+++ b/configure.in
@@ -465,16 +465,14 @@ AC_LANG([C])
 # -Wunsafe-loop-optimizations possible optimisation issues
 # -Wunused-parameter -Wunused-but-set-parameter unused parameters
 # -Wunused-macros unused macro warnings, but it also enable unused parameters
+# -Wstrict-prototypes show warning in grammar.y
 # attributes suggestion
 #  -Wsuggest-attribute=const -Wsuggest-attribute=format -Wsuggest-attribute=pure
 
-# flags what can be used but now return no warnings: -Warray-bounds -Wbool-compare -Wcast-align
-#   -Wchar-subscripts -Wchkp -Wclobbered -Wcomment -Wdisabled-optimization -Wempty-body 
-#   -Werror-implicit-function-declaration -Wignored-qualifiers -Wtrampolines -Wtype-limits
-#   -Wjump-misses-init -Wlogical-op  -Wmissing-field-initializers -Wmissing-parameter-type
-#   -Wnested-externs -Wold-style-declaration -Wold-style-definition -Woverlength-strings -Woverride-init
-#   -Wredundant-decls -Wstack-protector -Wstrict-prototypes -Wundef
-#   -Winit-self -Wpointer-arith -Wswitch-bool
+# flags what can be used but now return no warnings:
+#   -Wchkp -Wdisabled-optimization
+#   -Werror-implicit-function-declaration -Wtrampolines
+#   -Wjump-misses-init
 
 CFLAGS="$CFLAGS -pipe -ffast-math -Wall -Wextra -Wno-sign-compare"
 CPPFLAGS="$CPPFLAGS -I../common"
@@ -814,6 +812,9 @@ AC_CHECK_COMPILER_WNOFLAG(clobbered)
 AC_CHECK_COMPILER_WFLAG(empty-body)
 AC_CHECK_COMPILER_WFLAG(newline-eof)
 AC_CHECK_COMPILER_WFLAG(int-conversion)
+AC_CHECK_COMPILER_WFLAG(init-self)
+AC_CHECK_COMPILER_WFLAG(pointer-arith)
+AC_CHECK_COMPILER_WFLAG(switch-bool)
 AC_CHECK_COMPILER_WFLAG(enum-conversion)
 AC_CHECK_COMPILER_WFLAG(shorten-64-to-32)
 AC_CHECK_COMPILER_WFLAG(constant-conversion)
@@ -824,6 +825,13 @@ AC_CHECK_COMPILER_WFLAG(format-signedness)
 AC_CHECK_COMPILER_WFLAG(format-y2k)
 AC_CHECK_COMPILER_WFLAG(missing-include-dirs)
 AC_CHECK_COMPILER_WFLAG(suggest-attribute=noreturn)
+AC_CHECK_COMPILER_WFLAG(undef)
+AC_CHECK_COMPILER_WFLAG(cast-align)
+AC_CHECK_COMPILER_WFLAG(logical-op)
+AC_CHECK_COMPILER_WFLAG(nested-externs)
+AC_CHECK_COMPILER_WFLAG(old-style-definition)
+AC_CHECK_COMPILER_WFLAG(overlength-strings)
+AC_CHECK_COMPILER_WFLAG(redundant-decls)
 AC_CHECK_COMPILER_WNOFLAG(format-nonliteral)
 AC_CHECK_COMPILER_WNOFLAG(switch)
 AC_CHECK_COMPILER_WNOFLAG(missing-field-initializers)