The original code is perfectly valid standard C. However, some compilers (especially GCC) complain about duplicate const specifiers anyway.
At this point we cave in as there doesn't seem to be any efforts to fix this problem by the corresponding compiler vendors.
uGFX v3 will no longer suffer from this problem as the driver interface works differently in this area.
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To use this driver:
This driver is special in that it implements both the gdisp low level driver,
optionally a touchscreen driver, and optionally a toggle driver.
1. Add in your gfxconf.h:
a) #define GFX_USE_GDISP GFXON
b) Optionally #define GFX_USE_GINPUT GFXON
#define GINPUT_USE_MOUSE GFXON
#define GINPUT_USE_TOGGLE GFXON
c) Any optional high level driver defines (see gdisp.h) eg: GDISP_NEED_MULTITHREAD
d) Optionally the following (with appropriate values):
#define GDISP_SCREEN_WIDTH 640
#define GDISP_SCREEN_HEIGHT 480
2. To your makefile add the following lines:
include $(GFXLIB)/gfx.mk
include $(GFXLIB)/drivers/multiple/Win32/driver.mk
However, consider using the Win32 board file instead as this does include all
the possible drivers that can be used (eg. for the GAUDIO module) by using:
include $(GFXLIB)/gfx.mk
include $(GFXLIB)/boards/base/Win32/board.mk
3. Modify your makefile to add -lws2_32 and -lgdi32 to the DLIBS line. i.e.
DLIBS = -lws2_32 -lgdi32
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