libtool: Using libtool

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1 3 Using libtool
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1 It makes little sense to talk about using libtool in your own packages
1 until you have seen how it makes your life simpler.  The examples in
1 this chapter introduce the main features of libtool by comparing the
1 standard library building procedure to libtool's operation on two
1 different platforms:
1 
1 'a23'
1      An Ultrix 4.2 platform with only static libraries.
1 
1 'burger'
1      A NetBSD/i386 1.2 platform with shared libraries.
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1    You can follow these examples on your own platform, using the
11 preconfigured libtool script that was installed with libtool (⇒
 Configuring).
1 
1    Source files for the following examples are taken from the 'demo'
1 subdirectory of the libtool distribution.  Assume that we are building a
1 library, 'libhello', out of the files 'foo.c' and 'hello.c'.
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1    Note that the 'foo.c' source file uses the 'cos' math library
1 function, which is usually found in the standalone math library, and not
1 the C library (⇒Trigonometric Functions (libc)Trig Functions.).
1 So, we need to add '-lm' to the end of the link line whenever we link
11 'foo.lo' into an executable or a library (⇒Inter-library
 dependencies).
1 
1    The same rule applies whenever you use functions that don't appear in
1 the standard C library... you need to add the appropriate '-lNAME' flag
1 to the end of the link line when you link against those objects.
1 
1    After we have built that library, we want to create a program by
1 linking 'main.o' against 'libhello'.
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Menu

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· Creating object files       Compiling object files for libraries.
· Linking libraries           Creating libraries from object files.
· Linking executables         Linking object files against libtool libraries.
· Debugging executables       Running GDB on libtool-generated programs.
· Installing libraries        Making libraries available to users.
· Installing executables      Making programs available to users.
· Static libraries            When shared libraries are not wanted.
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