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Hello all,
I am new to linux and just starting out and have encountred a small problem. I have got uClinux running on my DE2-115 and have writen a user application to print hello world. I put my hello.c file and makefile in the folder uClinux-dist/user/hello and that has worked it will print the hello message and can view it in the console. Now the problem is I want to include libusb and call some of its function from my hello.c program. I downloaded libusb-0.1.12.tar.gz and have extracted this and compiled it into uClinux-dist/lib/libusb-0.1.12 I am thinking i need to tell the compiler somehow to link the lib/libusb-0.1.12/ so it can find this include as its not in the regular location for the standard includes. How will i do this? hello.c#include <stdio.h># include "usbpp.h"
int main()
{
printf("Hello world");
}
Makefile EXEC = hello
OBJS = hello.c
all: $(EXEC)
$(EXEC): $(OBJS)
$(CC) $(LDFLAGS) -o $@ $(OBJS) $(LDLIBS)
romfs:
$(ROMFSINST) /bin/$(EXEC)
clean:
-rm -f $(EXEC) *.elf *.gdb *.o
I think i may need to edit this makefile to link the libusb library. The error i get is: usbpp.h: no such file or directory Anyhelp is appreciated!
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any help would be appreciated
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Please try adding the following lines to (the beginning of) your Makefile
(sorry, I can't make sure it works without your setup)
LDFLAGS = -L/path/to/libusb/dir -lusb
CFLAGS = -I/path/to/libusb/include/dir
Also, make sure you have cross-compiled libusb within the nios2-uclinux environment. If you compile libusb for your system by simply typing "make" from the libusb source dir it won't ever work on uclinux.
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Thanks for the help, I used ./configure to include the args to cross compile for nios2-uclinux. Do i also need to make or make install after this?
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You used ./configure for the lib, right? Did you use the --host switch and set CC in order to specify you want to cross-compile for the nios2 architecture? I haven't tried it so I can't tell you the exact command.
Actually I'm not sure about how you should build your library. I thought you were just having a hard time to link it, so my hint was to add those lines to your application's Makefile.
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