Creating and Using Libraries

Caution When Mixing Shared and Archive Libraries

Figure 5-12

$ a.out

/usr/lib/dld.sl: Unresolved symbol: f2 (code) from /users/steve/dev/lib3.sl

Abort(coredump)

Example 2: Using shl_load(3X)

This example (in 32-bit and 64-bit +compat mode shows how mixing archive libraries and shared libraries using shl_load(3X) can lead to unsatisfied symbols and cause a program to abort.

If a library being loaded depends on a definition that does not exist in the application or any of the dependent shared libraries, the application will abort with an unsatisfied definition at run time. This seems obvious enough when an application is first created. However, over time, as the shared libraries evolve, new symbol imports may be introduced that were not originally anticipated. This problem can be avoided by ensuring that shared libraries maintain accurate dependency lists.

Suppose you have a main program, main(), and three functions, f1(), f2(), and f3() each in a separate source file. main() calls f1() and uses shl_load() to call f3(). main() does not call f2():

$ cc

-c

main.c f1.c f2.c

Compile to relocatable object code

$ cc

-c

+z f3.c

Compile to position-independent code

Chapter 5

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Kenwood HP 9000 manual Example 2 Using shlload3X
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HP 9000 specifications

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