[SOLVED] How to specify RPATH in a makefile?

How to specify RPATH in a makefile?

I'm trying to specify rpath in my binary. My makefile looks like this-

CC=gcc 
CFLAGS=-Wall
LDFLAGS= -rpath='../libs/'
main: main.c  
    gcc -o main main.c

clean:
    rm -f main main.o

But when I query rpath using command readelf -a ./main | grep rpath I get nothing I've tried specifying rpath as LDFLAGS= "-rpath=../libs/" but even that doesn't seem to work.

Can someone please post an example on how should I specify rpath in a makefile?

GCC and ld versions are-

gcc (Ubuntu/Linaro 4.5.2-8ubuntu4) 4.5.2
GNU ld (GNU Binutils for Ubuntu) 2.21.0.20110327

Solution

If you set the variables, you should probably use them. It's silly not to, especially when make won't magically set those variables for you! :)

main: main.c
    $(CC) $(CFLAGS) $(LDFLAGS) -o main main.c

Another problem is LDFLAGS, it should be

LDFLAGS="-Wl,-rpath,../libs/"

The usual gcc switch for passing options to linker is -Wl,, and it is needed because gcc itself may not understand the bare -rpath linker option. While some builds of various versions of gcc accept -rpath, I have never seen it documented in gcc man pages or info pages. For better portability, -Wl,-rpath should be preferred.