Re: [CMake] Merge two static libraries

pellegrini Tue, 05 Oct 2010 01:47:55 -0700

in fact the makefile we would like to generate should be able to:


   - build the console version of library (-DBUILD_WINDOW=False)

- build the console AND the window versions of the library(-DBUILD_WINDOW=True)


this is the latter case that triggered my questions.

Considering that only 2 files out of 50 will have a differentcompilation flag between the console and window mode, thatwould be a pity to duplicate the compilation of the 48 common sourcesfiles. That's why I was looking for a way to produce:


   - once the 48 objects files common to console and window building modes
   - twice the 2 object files specific to the building mode:
       * once in the console mode
       * once in the window mode
   - make a static library for the console mode
   - make a static library for the window mode

That's why to do so, I planned to build:
   - a static library for the 48 common files --> common.a

- a static library for the 2 specific files in console mode in whichI would have inserted common.a- a static library for the 2 specific files in window mode in whichI would have inserted common.a


but failed to perform the insertion step ...

Marcel Loose a écrit :

On 5-10-2010 at 10:10, in message <4caadd79.7000...@ill.fr>,

pellegrini

<pellegr...@ill.fr> wrote:

Hello everybody,
I have a library that can be built for a use in different modes(console, window). It is made of two sets of files. The first one is

common to
 the console/window building modes while the second set has to be be

built with a slightly different compiler flags depending on the

selected

building mode.
After many discussions here, I was advised to build a static library

for the the files common to console and window building modes
(e.g. common.a) and to build a second static library for the filesdepending on the building mode (e.g. console.a and window.a) linking

the

latter to the first one. I did it and ... it worked ! But what I

would

like is a little bit different. I would like my console.a (or

window.a)

library to
contain the object files of the common.a library. Indeed something

like

'ar cr console.a library.a'.

Would you have any idea ?

thank you

Eric


Hi Eric,

My first question is: why do you want to join these two libraries. I
understand from your mail that people suggested you to create two
separate libraries. Now you want to join them again.

To answer your question: you can't join two static libraries, not in a
portable way. You should specify a complete list of sources in your
CMakeLists.txt file for each of the two libraries. Something like:

SET(LIB_SOURCES common.c)
IF(BUILD_CONSOLE)
  LIST(APPEND LIB_SOURCES  console.c)
  ADD_LIBRARY(console ${LIB_SOURCES})
ELSEIF(BUILD_WINDOW)
  LIST(APPEND LIB_SOURCES window.c)
  ADD_LIBRARY(window ${LIB_SOURCES})
ENDIF(BUILD_CONSOLE)

The downside to this solution is that you have duplicates of the object
files that are part of common, but that's the price you'll have to pay
if you want to have just one static library.

HTH,
Marcel Loose.



--
Eric Pellegrini
Calcul Scientifique
Institut Laue-Langevin
Grenoble, France

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