Linker Tasks

 

Using Linker commands

 

The +e option overrides the -B symbolic option. For example, you use

NOTE

 

+e symbol, only symbol is exported and all other symbols are hidden.

 

Similarly, if you use +ee symbol, only symbol is exported, but other

 

symbols exported by default remain visible.

 

Since all internal calls inside the shared library are resolved inside the

 

shared library, user-supplied modules with the same name are not seen

 

by routines inside the library. For example, you could not replace

 

internal libc.sl malloc() calls with your own version of malloc() if

 

libc.sl was linked with -B symbolic.

 

Comparing -B symbolic with -h and +e

 

 

Similar to the -h(hide symbol) and +e (export symbol) linker options, -B

 

symbolic optimizes call paths in a shared library. However, unlike -hand

 

+e, all functions in a shared library linked with -Bsymbolic are also

 

visible outside of the shared library.

 

Case 1: Building a Shared Library with -B symbolic.

 

Suppose you have two functions to place in a shared library. The

 

convert_rtn() calls gal_to_liter().

 

1. Build the shared library with -b. Optimize the call path inside the

 

shared library with -B symbolic.

$ ld -B symbolic -b convert.o volume.o -o libunits.sl

2.Two main programs link to the shared library. main1 calls convert_rtn() and main2 calls gal_to_liter().

$ cc -Aa main1.c libunits.sl -o main1 $ cc -Aa main1.c libunits.sl -o main2

Figure 3-1 shows that a direct call path is established between convert_rtn() and gal_to_liter() inside the shared library. Both symbols are visible to outside callers.

Chapter 3

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Kenwood HP 9000 manual Comparing -B symbolic with -h and +e, Case 1 Building a Shared Library with -B symbolic
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