Linker error concerning main file when trying to compile demo

[dswl]

I’m still trying to get one of the demos to work on OS X.

Unfortunately I get a duplicate symbol error, but strangely for just one file.

duplicate symbol _main in:
    .build/obj/GFXLIB/demos/modules/gdisp/basics/main.o
ld: 1 duplicate symbol for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [.build/demotest.elf] Error 1

The linking ultimately fails. There is no other file than the modified example makefile from `ugfx/boards/base/OSX/example` in the project folder: No second main.c or any other custom file I wrote containing the main symbol. 

The C compiler options:

C Compiler Options....
gcc -c -L/usr/local/lib -lSDL2 -I/usr/local/include/SDL2 -D_THREAD_SAFE -I/usr/local/include/SDL2 -D_THREAD_SAFE -ggdb -O0 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk -mmacosx-version-min=10.11 -m64 -fomit-frame-pointer -Wall -Wextra -Wstrict-prototypes -fverbose-asm -MMD -MP -MF .build/dep/fakefile.o.d -I. -I../ugfx/demos/modules/gdisp/basics -I../ugfx -I../ugfx/3rdparty/tinygl-0.4-ugfx/include -I../ugfx/boards/base/OSX -I../ugfx/drivers/multiple/SDL -I../ugfx/demos/modules/gdisp/basics -DGFX_USE_OS_OSX=TRUE -DGFX_OS_PRE_INIT_FUNCTION=sdl_driver_init fakefile.c -o .build/obj/fakefile.o

The linker command:

Linker Options........
gcc -L/usr/local/lib -lSDL2 -I/usr/local/include/SDL2 -D_THREAD_SAFE -pthread -Wl,-syslibroot,/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk -mmacosx-version-min=10.11 -m64 -nostartfiles .build/obj/fakefile.o -o .build/demotest.elf

I modified the example makefile from `ugfx/boards/base/OSX/example` as follows:

# Possible Targets:	all clean Debug cleanDebug Release cleanRelease

##############################################################################################
# Settings
#

# General settings
	# See $(GFXLIB)/tools/gmake_scripts/readme.txt for the list of variables
	OPT_OS					= osx64
	OPT_LINK_OPTIMIZE		= no

# uGFX settings
	# See $(GFXLIB)/tools/gmake_scripts/library_ugfx.mk for the list of variables
	GFXLIB					= ../ugfx
	GFXBOARD				= OSX
	GFXDEMO					= modules/gdisp/basics

# OSX settings
	# See $(GFXLIB)/tools/gmake_scripts/os_osx.mk for the list of variables
	OSX_SDK = /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk
	OSX_ARCH = -mmacosx-version-min=10.11

##############################################################################################
# Set these for your project
#

ARCH     =
SRCFLAGS = -ggdb -O0
CFLAGS   = `sdl2-config --libs --cflags`
CXXFLAGS =
ASFLAGS  =
LDFLAGS  =

SRC      =
OBJS     =
DEFS     =
LIBS     =
INCPATH  =
LIBPATH  =

##############################################################################################
# These should be at the end
#

include $(GFXLIB)/demos/modules/gwin/widgets/demo.mk
include $(GFXLIB)/tools/gmake_scripts/library_ugfx.mk
include $(GFXLIB)/tools/gmake_scripts/os_$(OPT_OS).mk
include $(GFXLIB)/tools/gmake_scripts/compiler_gcc.mk
# *** EOF ***

I use uGFX 2.7 on OS X 10.11.6.

I appreciate any help pointing me out to what I'm doing wrong.

Regards

[cpu20]

You are compiling two demos at once in your Makefile:

GFXDEMO					= modules/gdisp/basics
include $(GFXLIB)/demos/modules/gwin/widgets/demo.mk

The best way to include the demo is by using GFXDEMO. Most likely the widgets demo is a leftover here you forgot to delete.

[dswl]

Thank you for pointing this out. The GFXDEMO variable was totally out of my view...