Hello this is my first post. I am a Trainee programmer who needs help on creating an CD database application. I am following the instructions from Linux programming 4th edition to create one by copying the codes. Now the problem occurs when I have to add a makefile I do not uderstand how to use a makefile work. Oh I am making sure I am using tabs - not spaces.

Below shows the code inside the makefile.

all: app

app: app_mysql.c app_test.c app_mysql.h
gcc -o app -I/usr/include/mysql app_mysql.c app_test.c -lmysqlclient -L/usr/lib/mysql

First of all, I am confused about what "-lmysqlclient -L/usr/lib/mysql" means. Also when run the Makefile , I get this error.

~]$ make -f Makefile
make: Nothing to be done for `all'.

Anyone knows what I am doing wrong.
Edit: Also you can download the code from here.

http://www.wrox.com/WileyCDA/WroxTit...-DOWNLOAD.html

and in ch08/app you will find all you need to create the CD database application.

Thank you.

I'm not a C programmer, but I believe tells gcc to look for the 'mysqlclient' in the directory '/usr/lib/mysql'.


This means what it says. Most likely you have already run make, so objects are already 'made' - it won't overwrite them by default, so it just tells you that there is nothing to be done. If you delete 'app' and run make again it will re-make it.

Read and absorb http://gcc.gnu.org/onlinedocs/gcc-4....l#Link-Options

I think uppercase L is a typo.

Nope, no typo ... it tells it in which DIRECTORY to look for
the libs specified with -l



Cheers,
Tink

Ah well, its been a long time since I did C. Not sure it was even the gcc compiler

Well. Make you must have successfully run before,
and now there's nothing to be done... is there an
"app" executable?

Ok, I have made it worked. I did not realised I had successfully compile my program. The problem was I did not know how to run the program when all I was suppose to type was

$ ./app

to run. Anyway, it works .