Add some usefull gcc 6 warnings.

2 files changed, 192 insertions, 1 deletions

diff --git a/configure b/configure
index c2df511b9..4bf9d9a90 100755
--- a/configure
+++ b/configure
@@ -1,5 +1,5 @@
 #! /bin/sh
-# From configure.in d8c88a7.
+# From configure.in af1c906.
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.69.
 #
@@ -4603,6 +4603,7 @@ ac_compiler_gnu=$ac_cv_c_compiler_gnu
 # -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
+# -wdiscarded-qualifiers show different const removal
 # attributes suggestion
 #  -Wsuggest-attribute=const -Wsuggest-attribute=format -Wsuggest-attribute=pure
 
@@ -7233,6 +7234,104 @@ rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 
 
 
+		{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC supports -Wmisleading-indentation" >&5
+$as_echo_n "checking whether $CC supports -Wmisleading-indentation... " >&6; }
+		OLD_CFLAGS="$CFLAGS"
+		CFLAGS="$CFLAGS -Werror -Wmisleading-indentation"
+		cat confdefs.h - <<_ACEOF >conftest.$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 -Wmisleading-indentation"
+				# Optionally, run a test
+				if test "x" != "x"; then
+					{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC can actually use -Wmisleading-indentation" >&5
+$as_echo_n "checking whether $CC can actually use -Wmisleading-indentation... " >&6; }
+					CFLAGS="$OLD_CFLAGS -Werror -Wmisleading-indentation"
+					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 -Wmisleading-indentation"
+
+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 $CC supports -Wnull-dereference" >&5
+$as_echo_n "checking whether $CC supports -Wnull-dereference... " >&6; }
+		OLD_CFLAGS="$CFLAGS"
+		CFLAGS="$CFLAGS -Werror -Wnull-dereference"
+		cat confdefs.h - <<_ACEOF >conftest.$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 -Wnull-dereference"
+				# Optionally, run a test
+				if test "x" != "x"; then
+					{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC can actually use -Wnull-dereference" >&5
+$as_echo_n "checking whether $CC can actually use -Wnull-dereference... " >&6; }
+					CFLAGS="$OLD_CFLAGS -Werror -Wnull-dereference"
+					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 -Wnull-dereference"
+
+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"
@@ -7497,6 +7596,94 @@ rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 
 
 
+		{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC supports -Wno-suggest-attribute=format" >&5
+$as_echo_n "checking whether $CC supports -Wno-suggest-attribute=format... " >&6; }
+		OLD_CFLAGS="$CFLAGS"
+		CFLAGS="$CFLAGS -Werror -Wno-suggest-attribute=format"
+		cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+int foo;
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+
+				# Recent versions of gcc don't fail if -Wno-foo is not recognized
+				# (unless there are also other warnings), so we also check for -Wfoo
+				# which always fails if not supported
+				CFLAGS="$OLD_CFLAGS -Werror -Wsuggest-attribute=format"
+				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 -Wno-suggest-attribute=format"
+						# Optionally, run a test
+						if test "x" != "x"; then
+							{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC can actually use -Wno-suggest-attribute=format" >&5
+$as_echo_n "checking whether $CC can actually use -Wno-suggest-attribute=format... " >&6; }
+							CFLAGS="$OLD_CFLAGS -Werror -Wsuggest-attribute=format"
+							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: not needed but enabled" >&5
+$as_echo "not needed but enabled" >&6; }
+									CFLAGS="$OLD_CFLAGS"
+
+else
+
+									CFLAGS="$OLD_CFLAGS -Werror -Wno-suggest-attribute=format"
+									cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+
+											{ $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+											CFLAGS="$OLD_CFLAGS -Wno-suggest-attribute=format"
+
+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
+
+
+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
+
+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
+
+
+
 # Certain versions of gcc make -Wshadow completely useless by making it flood
 # you with unnecessary warnings <https://lkml.org/lkml/2006/11/28/239>
 # Let's check if we can really use it
diff --git a/configure.in b/configure.in
index b308eab2d..f25c2592f 100644
--- a/configure.in
+++ b/configure.in
@@ -492,6 +492,7 @@ AC_LANG([C])
 # -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
+# -wdiscarded-qualifiers show different const removal
 # attributes suggestion
 #  -Wsuggest-attribute=const -Wsuggest-attribute=format -Wsuggest-attribute=pure
 
@@ -860,9 +861,12 @@ AC_CHECK_COMPILER_WFLAG(old-style-definition)
 AC_CHECK_COMPILER_WFLAG(overlength-strings)
 AC_CHECK_COMPILER_WFLAG(redundant-decls)
 AC_CHECK_COMPILER_WFLAG(cast-qual)
+AC_CHECK_COMPILER_WFLAG(misleading-indentation)
+AC_CHECK_COMPILER_WFLAG(null-dereference)
 AC_CHECK_COMPILER_WNOFLAG(format-nonliteral)
 AC_CHECK_COMPILER_WNOFLAG(switch)
 AC_CHECK_COMPILER_WNOFLAG(missing-field-initializers)
+AC_CHECK_COMPILER_WNOFLAG(suggest-attribute=format)
 
 # Certain versions of gcc make -Wshadow completely useless by making it flood
 # you with unnecessary warnings <https://lkml.org/lkml/2006/11/28/239>