Add very strict compiler warning flags.

Lots of new warnings to clean up.  Have fun.

acinclude.m4

@@ -577,3 +577,65 @@ AC_SUBST(LTCXXCOMPILE)
 # end dolt
 ])
 
+dnl as-compiler-flag.m4 0.1.0
+
+dnl autostars m4 macro for detection of compiler flags
+
+dnl David Schleef <ds@schleef.org>
+
+dnl $Id: as-compiler-flag.m4,v 1.1 2005/12/15 23:35:19 ds Exp $
+
+dnl AS_COMPILER_FLAG(CFLAGS, ACTION-IF-ACCEPTED, [ACTION-IF-NOT-ACCEPTED])
+dnl Tries to compile with the given CFLAGS.
+dnl Runs ACTION-IF-ACCEPTED if the compiler can compile with the flags,
+dnl and ACTION-IF-NOT-ACCEPTED otherwise.
+
+AC_DEFUN([AS_COMPILER_FLAG],
+[
+  AC_MSG_CHECKING([to see if compiler understands $1])
+
+  save_CFLAGS="$CFLAGS"
+  CFLAGS="$CFLAGS $1"
+
+  AC_TRY_COMPILE([ ], [], [flag_ok=yes], [flag_ok=no])
+  CFLAGS="$save_CFLAGS"
+
+  if test "X$flag_ok" = Xyes ; then
+    m4_ifvaln([$2],[$2])
+    true
+  else
+    m4_ifvaln([$3],[$3])
+    true
+  fi
+  AC_MSG_RESULT([$flag_ok])
+])
+
+dnl AS_COMPILER_FLAGS(VAR, FLAGS)
+dnl Tries to compile with the given CFLAGS.
+
+AC_DEFUN([AS_COMPILER_FLAGS],
+[
+  list=$2
+  flags_supported=""
+  flags_unsupported=""
+  AC_MSG_CHECKING([for supported compiler flags])
+  for each in $list
+  do
+    save_CFLAGS="$CFLAGS"
+    CFLAGS="$CFLAGS $each"
+    AC_TRY_COMPILE([ ], [], [flag_ok=yes], [flag_ok=no])
+    CFLAGS="$save_CFLAGS"
+
+    if test "X$flag_ok" = Xyes ; then
+      flags_supported="$flags_supported $each"
+    else
+      flags_unsupported="$flags_unsupported $each"
+    fi
+  done
+  AC_MSG_RESULT([$flags_supported])
+  if test "X$flags_unsupported" != X ; then
+    AC_MSG_WARN([unsupported compiler flags: $flags_unsupported])
+  fi
+  $1="$$1 $flags_supported"
+])
+

configure.ac

@@ -45,6 +45,33 @@ m4_define([libnotify_minimum_version], [0.3.0])
 m4_define([gnome_pilot_minimum_version], [2.0.15])
 m4_define([gweather_minimum_version], [2.25.3])
 
+# Compiler Warning Flags
+
+AS_COMPILER_FLAGS(WARNING_FLAGS,
+	"-DG_DISABLE_DEPRECATED
+	-DPANGO_DISABLE_DEPRECATED
+	-DGDK_PIXBUF_DISABLE_DEPRECATED
+	-DGDK_DISABLE_DEPRECATED
+	-Wall -Wextra
+	-Wno-missing-field-initializers
+	-Wno-sign-compare
+	-Wno-unused-parameter
+	-Wdeclaration-after-statement
+	-Werror-implicit-function-declaration
+	-Wformat-nonliteral -Wformat-security -Winit-self
+	-Wmissing-declarations -Wmissing-include-dirs
+	-Wmissing-noreturn -Wnested-externs -Wpointer-arith
+	-Wredundant-decls -Wundef -Wwrite-strings")
+AC_SUBST(WARNING_FLAGS)
+
+# Other useful compiler warnings for test builds only.
+# These may produce warnings we have no control over.
+#
+#	-Wmissing-format-attribute
+#	-Wshadow
+
+CFLAGS="$CFLAGS $WARNING_FLAGS"
+
 # GNOME Documentation
 GNOME_DOC_INIT
 # Gross hack to enable 'make dist' on automake 1.9+tar 1.14.
@@ -1383,21 +1410,6 @@ dnl We use AC_SUBST_FILE because AC_SUBST won't deal with newlines
 EVO_MARSHAL_RULE=$srcdir/marshal.mk
 AC_SUBST_FILE(EVO_MARSHAL_RULE)
 
-dnl *************************
-dnl CFLAGS and LIBS and stuff
-dnl *************************
-
-GNOME_COMPILE_WARNINGS(yes)
-CFLAGS="$CFLAGS $WARN_CFLAGS"
-case $CFLAGS in
-*-Wall*)
-	# Turn off the annoying "comparison between signed and unsigned"
-	# warning in gcc 3.3
-	CFLAGS="$CFLAGS -Wno-sign-compare"
-	;;
-esac
-
-
 dnl **************************
 dnl Check for X libs and -lX11
 dnl **************************