1.17. Building a Dynamic Library with GNU Make
Problem
You wish to use GNU make to build a dynamic library from a collection of C++ source files, such as those listed in Example 1-2.
Solution
First, create a makefile in the directory where you want your dynamic library to be
created, and declare a phony target all whose single
prerequisite is the dynamic library. Next, declare your dynamic library target. Its
prerequisites should be the object files from which the library will be built, and its
command script should be a command line to build the library from the collection of object
files, as demonstrated in Recipe 1.4. If
you are using GCC or a compiler with similar command-line syntax, customize the implicit
patterns rules, if necessary, by modifying one or more of the variables CXX, CXXFLAGS,
etc. used in make's database
of implicit rules, as shown in Recipe
1.15. Otherwise, write a pattern rule telling make how to compile .cpp files into
object files, using the command lines from Table 1-4 and the pattern rule syntax explained in Recipe 1.16. Finally, add install and clean targets,
as demonstrated in Recipe 1.15, and
machinery to automatically generate source file dependencies, as demonstrated in Recipe 1.16.
For example, to build a dynamic library from the source files listed Example 1-2 using GCC on Unix, create a makefile in the directory georgeringo, as shown in Example 1-22.
Example 1-22. Makefile for libgeorgeringo.so using GCC
# Specify extensions of files to delete when ...