[CMake] How to have a static/shared option in a Find script ?
Barth
barthelemy.von.haller at cern.ch
Mon Feb 20 05:37:36 EST 2012
Hello,
Thank you very much for your message. You have been very helpful.
Best regards,
Barth
On 02/16/2012 05:18 PM, Michael Hertling [via CMake] wrote:
> On 02/16/2012 03:14 PM, Barth wrote:
> > Hi again,
> >
> > I have understood what you meant :)
>
> Hhm, actually, I talked nonsense w.r.t. DIM_USE_STATIC. ;)
>
> > For records here is what I did :
> >
> > # (1) Use FIND_LIBRARY() to look for the shared and the static library
> > # and define DIM_SHARED_LIBRARY and DIM_STATIC_LIBRARY in the
> cache.
> > find_library(DIM_STATIC_LIBRARY NAMES libdim.a PATHS $ENV{DIMDIR}
> > PATH_SUFFIXES linux)
> > find_library(DIM_SHARED_LIBRARY NAMES dim PATHS $ENV{DIMDIR}
> PATH_SUFFIXES
> > linux)
>
> If libdim.so doesn't exist, but libdim.a does, the last FIND_LIBRARY()
> call would return libdim.a, too, which is probably not desired. Here,
> one should consider to narrow the search for the respective library
> type, e.g. by manipulating CMAKE_FIND_LIBRARY_SUFFIXES; see also
> CMAKE_{SHARED,STATIC}_LIBRARY_{PREFIX,SUFFIX} in this regard.
>
> > # (2) Inspect DIM_FIND_COMPONENTS to see which flavor has been
> requested,
> > # defaulting to "shared" if no components have been requested at
> all.
> > LIST(FIND DIM_FIND_COMPONENTS static ASK_STATIC_COMP)
> > LIST(FIND DIM_FIND_COMPONENTS shared ASK_SHARED_COMP)
>
> No need for them; use DIM_FIND_REQUIRED_{STATIC,SHARED} - predefined
> by FIND_PACKAGE(). Refer to Modules/readme.txt for more information.
>
> > # (3) Warn or bail out if "shared" and "static" have both been
> requested
> > if ( ${ASK_STATIC_COMP} GREATER -1 AND ${ASK_SHARED_COMP} GREATER -1)
> > message(WARNING "Two incompatible components specified : static and
> > shared. We are going to ignore the static component.")
> > endif ( ${ASK_STATIC_COMP} GREATER -1 AND ${ASK_SHARED_COMP} GREATER
> -1)
>
> IF(DIM_FIND_REQUIRED_SHARED AND DIM_FIND_REQUIRED_STATIC)
> MESSAGE(WARNING ...)
> LIST(REMOVE_ITEM DIM_FIND_COMPONENTS static)
> UNSET(DIM_FIND_REQUIRED_STATIC)
> ENDIF()
>
> Do something to the contrary if DIM_FIND_COMPONENTS is empty:
>
> IF(NOT DIM_FIND_COMPONENTS)
> LIST(APPEND DIM_FIND_COMPONENTS shared)
> SET(DIM_FIND_REQUIRED_SHARED TRUE)
> ENDIF()
>
> The point is that DIM_FIND_COMPONENTS and DIM_FIND_REQUIRED_* are set
> up properly *before* you are going to actually enable the components.
>
> > # (4) DIM_USE_STATIC decides if DIM_LIBRARIES receives
> DIM_STATIC_LIBRARY
> > # or DIM_SHARED_LIBRARY
> > option(DIM_FORCE_STATIC "Turn on to force the use of the static
> library"
> > OFF)
> > if( ${DIM_FORCE_STATIC} OR ${ASK_STATIC_COMP} GREATER -1)
> > set(DIM_LIBRARIES ${DIM_STATIC_LIBRARY} )
> > else ( ${DIM_FORCE_STATIC} OR ${ASK_STATIC_COMP} GREATER -1)
> > set(DIM_LIBRARIES ${DIM_SHARED_LIBRARY} )
> > endif( ${DIM_FORCE_STATIC} OR ${ASK_STATIC_COMP} GREATER -1)
>
> UNSET(DIM_INCLUDE_DIRS)
> UNSET(DIM_LIBRARIES)
>
> SET(DIM_FOUND FALSE)
>
> FIND_PATH(DIM_INCLUDE_DIR ...)
>
> IF(DIM_INCLUDE_DIR)
> SET(DIM_FOUND TRUE)
> ENDIF
>
> IF(DIM_FIND_REQUIRED_SHARED)
> FIND_LIBRARY(DIM_SHARED_LIBRARY ...)
> FIND_PACKAGE_HANDLE_STANDARD_ARGS(
> DIM_SHARED
> DEFAULT_MSG
> DIM_INCLUDE_DIR
> DIM_SHARED_LIBRARY)
> IF(DIM_SHARED_FOUND)
> LIST(APPEND DIM_INCLUDE_DIRS ${DIM_INCLUDE_DIR} ...)
> LIST(APPEND DIM_LIBRARIES ${DIM_SHARED_LIBRARY} ...)
> ENDIF()
> LIST(REMOVE DIM_FIND_COMPONENTS shared)
> UNSET(DIM_FIND_REQUIRED_SHARED)
> ENDIF()
>
> IF(DIM_FIND_REQUIRED_STATIC)
> FIND_LIBRARY(DIM_STATIC_LIBRARY ...)
> FIND_PACKAGE_HANDLE_STANDARD_ARGS(
> DIM_STATIC
> DEFAULT_MSG
> DIM_INCLUDE_DIR
> DIM_STATIC_LIBRARY)
> IF(DIM_STATIC_FOUND)
> LIST(APPEND DIM_INCLUDE_DIRS ${DIM_INCLUDE_DIR} ...)
> LIST(APPEND DIM_LIBRARIES ${DIM_STATIC_LIBRARY} ...)
> ENDIF()
> LIST(REMOVE DIM_FIND_COMPONENTS static)
> UNSET(DIM_FIND_REQUIRED_STATIC)
> ENDIF()
>
> # Consider to handle remaining components in DIM_FIND_COMPONENTS.
>
> Note that due to the preparatory work on DIM_FIND_COMPONENTS and the
> DIM_FIND_REQUIRED_* variables, the blocks for enabling the shared and
> static component have a straight forward structure. Note further that
> this can be achieved only with a quite simple package like yours with
> two mutually exclusive libraries; with packages providing more subtly
> related components - e.g. with inter-component dependencies - things
> can be much more complicated. Note finally that the user must issue
>
> IF(DIM_FOUND AND DIM_SHARED_FOUND)
>
> e.g., in order to check for the library's availability unless the
> REQUIRED flag was given to FIND_PACKAGE(). Checking for DIM_FOUND
> or DIM_SHARED_FOUND alone is *not* reliable, just as referring to
> a component that hasn't been requested explicitly - or enabled by
> default which, in turn, should be documented explicitly.
>
> Regards,
>
> Michael
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