[CMake] help with learning add_library

[luxInteg]

On Monday 08 November 2010 18:10:01 Eric Noulard wrote:
> 2010/11/8 luxInteg <lux-integ at btconnect.com>:
> > On Saturday 06 November 2010 23:08:29 Eric Noulard wrote:
> >> I think you cannot use **the same** file properties on a source file
> >> and expect CMake will compile the file twice for the same target.
> >> If you want to compile the same source file twice with different compile
> >> flags **FOR THE SAME TARGET** you have to copy this file
> >> 
> >> 
> >> SET_SOURCE_FILES_PROPERTIES(file1-long.c PROPERTIES
> >> COMPILE_DEFINITIONS "-DLONG")
> >> 
> >> 
> >> ** same for file 2 **
> >> ADD_LIBRARY(LearnCMAKE-static STATIC file1.c file1-long.c file2.c
> >> file2-long.c) ADD_LIBRARY(LearnCMAKE-shared SHARED file1.c file1-long.c
> >> file2.c file2-long.c)
> > 
> > BUT
> > suppose I decide to set   file1.c and file2.c   as some variable "FILES"
> > and I want to use a preprocessor say DLONG
> >  could I do the following?
> > 
> > set(FILES file1.c file2.c )
> > SET_SOURCE_FILES_PROPERTIES(${FILES} PROPERTIES COMPILE_DEFINITIONS
> > "-DLONG")
> 
> Off course you can
thanks, it worked a treat.
> BUT you cannot set the SAME PROPERTY twice for the same file.
> So if you have to do so (compile fileX.c with BOTH -DINT and DLONG) then
> you have to do some sort of loop with CMake or
> populate 2 CMake variable
> 
> SRC_FILES_LONG
> and
> SRC_FILES_INT
> with the list of appropriate file.
> 
> If you manipulate list have a look at the CMake builtin "LIST" command.

I   had a look at lists  on this page  
http://www.cmake.org/Wiki/CMakeMacroListOperations

I have also  came across this problem:-  I have  some files say 
file1.c
file2.c
file3.c
file4.c

to be compiled into a  library

before archiving 
file1.c  is compiled into file1.o
but file2.c  and file3.c  are compiled int file2file3.o  then 
file4.c  is compiled into  file4.o


I  had a cursory look at list an came up with this   embryonic/rudimentary  
'half-attempt'
But I am stuck   on   the bracketed line


---------------
set(RUN oddone.o  file2.c file3.c )
LIST CONTAINS(file2.c file3.c  ${RUN})
IF (contains )
  (--compile  file2.c and file3.c into  oddone.o  )
endif (contains)
-------------
advice on whether lists of othrwise is appropriate  would be  appreciated.