Very simple application fails with "multiple target patterns" from Eclipse
c++, cygwin, eclipse, gcc, makefile
Solution
Are you working from a Cygwin installation?
I've seen this problem before using Cygwin--basically, `make` sees the `:` in the path and thinks it is another target definition, hence the error.
If you are working from a Cygwin installation, you might try replacing the `c:/` with `/cygdrive/c/`. If not, you might try using relative paths or using a network mount and see if that fixes it.
Problem
Since I'm more comfortable using Eclipse, I thought I'd try converting my project from Visual Studio. Yesterday I tried a very simple little test. No matter what I try, `make` fails with "multiple target patterns". (This is similar to this unanswered question.) I have three files: Application.cpp: ``` using namespace std; #include "Window.h" int main() { Window *win = new Window(); delete &win; return 0; } ``` Window.h: ``` #ifndef WINDOW_H_ #define WINDOW_H_ class Window { public: Window(); ~Window(); }; #endif ``` Window.cpp: ``` #include <cv.h> #include <highgui.h> #include "Window.h" const char* WINDOW_NAME = "MyApp"; Window::Window() { cvNamedWindow(WINDOW_NAME, CV_WINDOW_AUTOSIZE); cvResizeWindow(WINDOW_NAME, 200, 200); cvMoveWindow(WINDOW_NAME, 0, 0); int key = 0; while (true) { key = cvWaitKey(0); if (key==27 || cvGetWindowHandle(WINDOW_NAME)==0) { break; } } } Window::~Window() { cvDestroyWindow(WINDOW_NAME); } ``` I have added the following paths to the compiler include path (`-I`): ``` "$(OPENCV)/cv/include" "$(OPENCV)/cxcore/include" "$(OPENCV)/otherlibs/highgui" ``` I have added the following libraries to the linker (`-l`): ``` cv cxcore highgui ``` And the following library search path (`-L`): ``` "$(OPENCV)/lib/" ``` Eclipse, the compiler and the linker all succeed in including the headers and libraries. I am using the GNU C/C++ compiler & linker from Cygwin. When compiling, I get the following `make` error: `src/Window.d:1: *** multiple target patterns. Stop.` Window.d contains: ``` src/Window.d src/Window.o: ../src/Window.cpp \ C:/Program\ Files/OpenCV/cv/include/cv.h \ C:/Program\ Files/OpenCV/cxcore/include/cxcore.h \ C:/Program\ Files/OpenCV/cxcore/include/cxtypes.h \ C:/Program\ Files/OpenCV/cxcore/include/cxerror.h \ C:/Program\ Files/OpenCV/cxcore/include/cvver.h \ C:/Program\ Files/OpenCV/cxcore/include/cxcore.hpp \ C:/Program\ Files/OpenCV/cv/include/cvtypes.h \ C:/Program\ Files/OpenCV/cv/include/cv.hpp \ C:/Program\ Files/OpenCV/cv/include/cvcompat.h \ C:/Program\ Files/OpenCV/otherlibs/highgui/highgui.h \ C:/Program\ Files/OpenCV/cxcore/include/cxcore.h ../src/Constants.h \ ../src/Window.h C:/Program\ Files/OpenCV/cv/include/cv.h: C:/Program\ Files/OpenCV/cxcore/include/cxcore.h: C:/Program\ Files/OpenCV/cxcore/include/cxtypes.h: C:/Program\ Files/OpenCV/cxcore/include/cxerror.h: C:/Program\ Files/OpenCV/cxcore/include/cvver.h: C:/Program\ Files/OpenCV/cxcore/include/cxcore.hpp: C:/Program\ Files/OpenCV/cv/include/cvtypes.h: C:/Program\ Files/OpenCV/cv/include/cv.hpp: C:/Program\ Files/OpenCV/cv/include/cvcompat.h: C:/Program\ Files/OpenCV/otherlibs/highgui/highgui.h: C:/Program\ Files/OpenCV/cxcore/include/cxcore.h: ../src/Window.h: ``` I tried removing all OpenCV headers from Window.d (from line 2 onwards), but the error remains. Also, I've updated Eclipse and OpenCV, all to no avail. Do you have any ideas worth trying? I'm willing to try anything!