What Happens When You Compile and Link a Program

Linking with Libraries

$ f77 -v sumnum.f

...

/usr/ccs/bin/ld -x /opt/langtools/lib/crt0.o \ sumnum.o -lcl -lisamstub -lc

The Default Library Search Path

By default, ld searches for libraries in the directory /usr/lib. (If the -por -Gcompiler profiling option is specified on the command line, the compiler directs the linker to also search /usr/lib/libp.) The default order can be overridden with the LPATH environment variable or the -Llinker option. LPATH and -Lare described in “Changing the Default Library Search Path with -L and LPATH” on page 57.

 

Link Order

 

The linker searches libraries in the order in which they are specified on

 

the command line — the link order. Link order is important in that a

 

library containing an external reference to another library must precede

 

the library containing the definition. This is why libc is typically the

 

last library specified on the linker command line: because the other

 

libraries preceding it in the link order often contain references to libc

 

routines and so must precede it.

 

If multiple definitions of a symbol occur in the specified libraries, ld does

NOTE

 

not necessarily choose the first definition. It depends on whether the

 

program is linked with archive libraries, shared libraries, or a

 

combination of both. Depending on link order to resolve such library

 

definition conflicts is risky because it relies on undocumented linker

 

behavior that may change in future releases. (See Also “Caution When

 

Mixing Shared and Archive Libraries” on page 164.)

 

 

Chapter 2

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Kenwood HP 9000 manual Default Library Search Path, Link Order

HP 9000 specifications

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