aCC compiler and libraries

[Pratheesh]

We are using message Queue libraries(libmqm) for linking to an executable, which is compiled by aCC compiler. Usually We will link the messageQ library as follows:

aCC -o main main.cc -L/tools/rp56/lib -lmqm .

Under /tools/rp56/lib, We have one shared library and one archive libary of the same name. ie; libmqm.sl and libmqm.a .

1) How can I make sure that while linking with -l option it will pick up archive ?
2) Is there any default setting like, it will always pick up shared one first?
3) If there is a default setting, What is the option for picking up the other one?

Can anybody throw some light on this ?

[A. Clay Stephenson]

You can use the +A argument to aCC to instruct ACC that all -l references are archive libraries but if you want to use both archive and shared librararies then you need to pass the -a archive_shared option to the linker phase of aCC. -a archive_shared tell ld to look first for archived libraries but if not found use the shared version.

Man aCC, ld for details.

[curt larson_1]

If both an archive and shared version of a particular library reside in the same directory, the linker links in the shared version by default. You can override this behavior with the -a linker option.
NOTE: You can use the +A option if you are using only archive libraries to create a completely archived executable.


The -a linker option tells the linker which type of library to use. The -a option is positional and applies to all subsequent libraries specified with the -l option until the end of the command line or until the next -a option is encountered. Pass the -a option to the linker with the -Wx,args option.

The following example directs the linker to use the archive version of the library libshape, followed by standard shared libraries if they exist; otherwise select archive versions.

aCC box.o sphere.o -Wl,-a,archive -lshape -Wl,-a,default

[Mike Stroyan]

You can also force archive for one library by using
-l:libmqrn.a
That can be less trouble-prone when most libraries should be using shared libraries.