build: Enforce -Wundef on all targets.

Simulators (and some hosted targets) no longer get a free pass!

This commit includes general fixes for simulator builds, but it
will undoubtedly result in many more warnings that need to be properly
fixed.

Change-Id: I6bb9d3fc4a29ccfe40366c438e058b5dfff0ddc3

firmware/drivers/button.c

···
 #include "serial.h"
 #include "power.h"
 #include "powermgmt.h"
-#if defined(HAVE_SDL) && (SDL_MAJOR_VERSION > 1)
+#if defined(HAVE_SDL)
+#include <SDL.h>
+#if (SDL_MAJOR_VERSION > 1)
 #include "button-sdl.h"
 #else
 #include "button-target.h"
 #endif
+#endif /* HAVE_SDL */
 #ifdef HAVE_REMOTE_LCD
 #include "lcd-remote.h"
 #endif

firmware/export/config.h

···
 #elif defined(RG_NANO)
 #include "config/rgnano.h"
 #else
-//#error "unknown hwardware platform!"
+#error "unknown hardware platform!"
 #endif
 
 #ifndef CONFIG_CPU
···
 #endif
 
 #ifdef APPLICATION
+#ifndef CONFIG_CPU
 #define CONFIG_CPU 0
+#endif
 #endif
 
 /* keep this include after the target configs */

firmware/export/config/sim.h

···
    target specific configs */
 
 #undef CONFIG_CPU
+#define CONFIG_CPU 0
 
 #undef HAVE_FMADC
 
···
 #undef HAVE_ATA_POWER_OFF
 
 #undef CONFIG_LCD
+#define CONFIG_LCD 0
+
 #undef LCD_DPI /* likely to be too different on a PC */
 
 #undef CONFIG_LED
···
 
 #undef BUTTON_DRIVER_CLOSE
 
-#if     CONFIG_BACKLIGHT_FADING == BACKLIGHT_FADING_SW_HW_REG
+#if defined(CONFIG_BACKLIGHT_FADING)
+#if     (CONFIG_BACKLIGHT_FADING == BACKLIGHT_FADING_SW_HW_REG)
 #undef  CONFIG_BACKLIGHT_FADING
         /* simulate SW_SETTING, as we handle sdl very similary */
 #define CONFIG_BACKLIGHT_FADING BACKLIGHT_FADING_SW_SETTING
···
         CONFIG_BACKLIGHT_FADING == BACKLIGHT_FADING_TARGET)
         /* we don't simulate that yet */
 #undef  CONFIG_BACKLIGHT_FADING
-#endif
+#endif /* CONFIG_BACKLIGHT_FADING == BACKLIGHT_FADING_SW_HW_REG */
+#endif /* defined(CONFIG_BACKLIGHT_FADING) */
 
 #ifdef  HAVE_BACKLIGHT_BRIGHTNESS
 #undef  DEFAULT_BRIGHTNESS_SETTING

tools/configure

···
  app_type=$1
  winbuild=""
  macbuild=""
- GCCOPTS=`echo $CCOPTS | sed -e s/\ -ffreestanding// -e s/\ -nostdlib// -e s/\ -Wundef//`
+ GCCOPTS=`echo $CCOPTS | sed -e s/\ -ffreestanding// -e s/\ -nostdlib//`
 
  if [ "yes" = "$use_debug" ]; then
     GCCOPTS=`echo $GCCOPTS | sed -e s/\ -Os/\ -Og/`
···
  # Scratchbox sets up "gcc" based on the active target
  prefixtools ""
 
- GCCOPTS=`echo $CCOPTS | sed -e s/-ffreestanding// -e s/-nostdlib// -e s/-Wundef//`
+ GCCOPTS=`echo $CCOPTS | sed -e s/-ffreestanding// -e s/-nostdlib//`
  GCCOPTS="$GCCOPTS -fno-builtin -g -I\$(SIMDIR)"
  GCCOPTIMIZE=''
  LDOPTS="-lm -ldl $LDOPTS"
···
  LDOPTS="-L$PNDSDK/arm-angstrom-linux-gnueabi/usr/lib -Wl,-rpath,$PNDSDK/arm-angstrom-linux-gnueabi/usr/lib $LDOPTS"
  PKG_CONFIG="pkg-config"
 
- GCCOPTS=`echo $CCOPTS | sed -e s/-ffreestanding// -e s/-nostdlib// -e s/-Wundef//`
+ GCCOPTS=`echo $CCOPTS | sed -e s/-ffreestanding// -e s/-nostdlib//`
  GCCOPTS="$GCCOPTS -fno-builtin -g -I\$(SIMDIR)"
  GCCOPTIMIZE=''
  LDOPTS="-lm -ldl $LDOPTS"
···
 
     # the prebuilt android NDK only supports x86_64 architecture anyway, so we can take shortcuts
     buildhost=$(uname | tr "[:upper:]" "[:lower:]")-x86_64
-    GCCOPTS=`echo $CCOPTS | sed -e s/-ffreestanding// -e s/-nostdlib// -e s/-Wundef//`
+    GCCOPTS=`echo $CCOPTS | sed -e s/-ffreestanding// -e s/-nostdlib//`
     LDOPTS="$LDOPTS -ldl -llog"
     if [ "$modelname" != "ibassodx50" ] && [ "$modelname" != "ibassodx90" ]; then
         LDOPTS="$LDOPTS -Wl,-soname,librockbox.so -shared"
···
     # the prebuilt android NDK only supports x86_64 architecture anyway, so we can take shortcuts
     buildhost=$(uname -s | tr "[:upper:]" "[:lower:]")-x86_64
 
-    GCCOPTS=`echo $CCOPTS | sed -e s/-ffreestanding// -e s/-nostdlib// -e s/-Wundef//`
+    GCCOPTS=`echo $CCOPTS | sed -e s/-ffreestanding// -e s/-nostdlib//`
     LDOPTS="$LDOPTS -ldl -llog"
     SHARED_LDFLAGS="-shared"
     SHARED_CFLAGS=''
···
     DLLWRAP=$FUNKEY_SDK_PATH/bin/arm-funkey-linux-musleabihf-dllwrap
     RANLIB=$FUNKEY_SDK_PATH/bin/arm-funkey-linux-musleabihf-gcc-ranlib
 
-    GCCOPTS=`echo $CCOPTS | sed -e s/\ -ffreestanding// -e s/\ -nostdlib// -e s/\ -Wundef//`
+    GCCOPTS=`echo $CCOPTS | sed -e s/\ -ffreestanding// -e s/\ -nostdlib//`
 
     if [ "yes" = "$use_debug" ]; then
         GCCOPTS=`echo $GCCOPTS | sed -e s/\ -Os/\ -Og/`