Section 20.7. Building the Library

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20.7. Building the Library

The database library consists of two files: a public C header file and a C source file. We can build a static library using the commands

 gcc -I../include -Wall -c db.c ar rsv libapue_db.a db.o 

Applications that want to link with libapue_db.a will also need to link with libapue.a, since we use some of our common functions in the database library.

If, on the other hand, we want to build a dynamic shared library version of the database library, we can use the following commands:

 gcc -I../include -Wall -fPIC -c db.c gcc -shared -Wl,-soname,libapue_db.so.1 -o libapue_db.so.1 \     -L../lib -lapue -lc db.o 

The resulting shared library, libapue_db.so.1, needs to be placed in a common directory where the dynamic linker/loader can find it. Alternatively, we can place it in a private directory and modify our LD_LIBRARY_PATH environment variable to include the private directory in the search path of the dynamic linker/loader.

The steps used to build shared libraries vary among platforms. Here, we have shown how to do it on a Linux system with the GNU C compiler.

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    Advanced Programming in the UNIX Environment
    Advanced Programming in the UNIX Environment, Second Edition (Addison-Wesley Professional Computing Series)
    ISBN: 0321525949
    EAN: 2147483647
    Year: 2005
    Pages: 370

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