linking problems
 

Hi ,
I created a lib.a from several c files.
now I write a test. c case which suppose to call some functions from
the lib.a.
the compilation succedded but the linking not. I get : undefined reference to 'function name' .....
but I have a '.h' file which has the prototypes to these functions and it is included in the test.c file.
please tell me what do I do wrong.

You forgot to tell gcc to link with the library. What commands do you enter to compile and link?

gcc -o test.exe $(OBJ) $(LIBS)
and LIBS = -L. lib1.a lib2.a .......

lib.a is not a good name.
a lib must be named:

libname


e.g to link a library called libwmoti

gcc prog.o -lwmoti


the linker implictly looks for a library
named libwmoti

ok I did what you have told me , but nothing ,
still get the error : undefined reference to 'func name'..

need more info.

ok ,
I build some libs ( libname1.a.... )with 'ar.....'
after that I wrote a test.cpp file to check these libs.
and the compilation is ok but linking not.
I get some errors of : undefined reference to '.....'
in the makefile of test I have LIBS = -lname ....
and also IFLAGS = -Iincludefiles.h

in Makefile


LDFLAGS = -L /lib/directory

LDLIBS = -lname1

post the error message

alraedy done this ,
p.s. the libs , code and exe are in the same folder
just to make it simple.
the develop machine isnot connected to the net , so I'ii try to copy
the msg : In function 'aaa()' file :file_from_libname1.cpp:54 :undefined reference to 'Funcionname from lib'

regards,
Moti

I also checked inside the lib :
nm -g libname.a
and these undefined referened functions are there.

post the make output.

In Function 'JpgFile::JpgStartCompress(int, int ,int )':
JpgFile.cpp:94: undefined reference to 'jpeg_destroy_compress'
.
.
.
and many lines like this one