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Hello, <br>
<br>
Thank you very much for your message. You have been very helpful. <br>
<br>
Best regards,<br>
Barth<br>
<br>
On 02/16/2012 05:18 PM, Michael Hertling [via CMake] wrote:
<blockquote cite="mid:4F3D2C4F.40407@online.de" type="cite">
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On 02/16/2012 03:14 PM, Barth wrote:
<br>
> Hi again,
<br>
> <br>
> I have understood what you meant :)
<br>
<br>
Hhm, actually, I talked nonsense w.r.t. DIM_USE_STATIC. ;)
<br>
<br>
> For records here is what I did :
<br>
> <br>
> # (1) Use FIND_LIBRARY() to look for the shared and the
static library
<br>
> # and define DIM_SHARED_LIBRARY and DIM_STATIC_LIBRARY in
the cache. <br>
> find_library(DIM_STATIC_LIBRARY NAMES libdim.a PATHS
$ENV{DIMDIR}
<br>
> PATH_SUFFIXES linux)
<br>
> find_library(DIM_SHARED_LIBRARY NAMES dim PATHS $ENV{DIMDIR}
PATH_SUFFIXES
<br>
> linux)
<br>
<br>
If libdim.so doesn't exist, but libdim.a does, the last
FIND_LIBRARY()
<br>
call would return libdim.a, too, which is probably not desired.
Here,
<br>
one should consider to narrow the search for the respective
library
<br>
type, e.g. by manipulating CMAKE_FIND_LIBRARY_SUFFIXES; see also
<br>
CMAKE_{SHARED,STATIC}_LIBRARY_{PREFIX,SUFFIX} in this regard.
<br>
<br>
> # (2) Inspect DIM_FIND_COMPONENTS to see which flavor has
been requested,
<br>
> # defaulting to "shared" if no components have been
requested at all. <br>
> LIST(FIND DIM_FIND_COMPONENTS static ASK_STATIC_COMP) <br>
> LIST(FIND DIM_FIND_COMPONENTS shared ASK_SHARED_COMP) <br>
<br>
No need for them; use DIM_FIND_REQUIRED_{STATIC,SHARED} -
predefined
<br>
by FIND_PACKAGE(). Refer to Modules/readme.txt for more
information.
<br>
<br>
> # (3) Warn or bail out if "shared" and "static" have both
been requested
<br>
> if ( ${ASK_STATIC_COMP} GREATER -1 AND ${ASK_SHARED_COMP}
GREATER -1)
<br>
> message(WARNING "Two incompatible components specified :
static and
<br>
> shared. We are going to ignore the static component.")
<br>
> endif ( ${ASK_STATIC_COMP} GREATER -1 AND ${ASK_SHARED_COMP}
GREATER -1)
<br>
<br>
IF(DIM_FIND_REQUIRED_SHARED AND DIM_FIND_REQUIRED_STATIC)
<br>
MESSAGE(WARNING ...)
<br>
LIST(REMOVE_ITEM DIM_FIND_COMPONENTS static)
<br>
UNSET(DIM_FIND_REQUIRED_STATIC)
<br>
ENDIF()
<br>
<br>
Do something to the contrary if DIM_FIND_COMPONENTS is empty:
<br>
<br>
IF(NOT DIM_FIND_COMPONENTS)
<br>
LIST(APPEND DIM_FIND_COMPONENTS shared)
<br>
SET(DIM_FIND_REQUIRED_SHARED TRUE)
<br>
ENDIF()
<br>
<br>
The point is that DIM_FIND_COMPONENTS and DIM_FIND_REQUIRED_* are
set
<br>
up properly *before* you are going to actually enable the
components.
<br>
<br>
> # (4) DIM_USE_STATIC decides if DIM_LIBRARIES receives
DIM_STATIC_LIBRARY
<br>
> # or DIM_SHARED_LIBRARY
<br>
> option(DIM_FORCE_STATIC "Turn on to force the use of the
static library"
<br>
> OFF)
<br>
> if( ${DIM_FORCE_STATIC} OR ${ASK_STATIC_COMP} GREATER -1) <br>
> set(DIM_LIBRARIES ${DIM_STATIC_LIBRARY} )
<br>
> else ( ${DIM_FORCE_STATIC} OR ${ASK_STATIC_COMP} GREATER -1)
<br>
> set(DIM_LIBRARIES ${DIM_SHARED_LIBRARY} )
<br>
> endif( ${DIM_FORCE_STATIC} OR ${ASK_STATIC_COMP} GREATER -1)
<br>
<br>
UNSET(DIM_INCLUDE_DIRS)
<br>
UNSET(DIM_LIBRARIES)
<br>
<br>
SET(DIM_FOUND FALSE)
<br>
<br>
FIND_PATH(DIM_INCLUDE_DIR ...)
<br>
<br>
IF(DIM_INCLUDE_DIR)
<br>
SET(DIM_FOUND TRUE)
<br>
ENDIF
<br>
<br>
IF(DIM_FIND_REQUIRED_SHARED)
<br>
FIND_LIBRARY(DIM_SHARED_LIBRARY ...)
<br>
FIND_PACKAGE_HANDLE_STANDARD_ARGS(
<br>
DIM_SHARED
<br>
DEFAULT_MSG
<br>
DIM_INCLUDE_DIR
<br>
DIM_SHARED_LIBRARY)
<br>
IF(DIM_SHARED_FOUND)
<br>
LIST(APPEND DIM_INCLUDE_DIRS ${DIM_INCLUDE_DIR} ...)
<br>
LIST(APPEND DIM_LIBRARIES ${DIM_SHARED_LIBRARY} ...)
<br>
ENDIF()
<br>
LIST(REMOVE DIM_FIND_COMPONENTS shared)
<br>
UNSET(DIM_FIND_REQUIRED_SHARED)
<br>
ENDIF()
<br>
<br>
IF(DIM_FIND_REQUIRED_STATIC)
<br>
FIND_LIBRARY(DIM_STATIC_LIBRARY ...)
<br>
FIND_PACKAGE_HANDLE_STANDARD_ARGS(
<br>
DIM_STATIC
<br>
DEFAULT_MSG
<br>
DIM_INCLUDE_DIR
<br>
DIM_STATIC_LIBRARY)
<br>
IF(DIM_STATIC_FOUND)
<br>
LIST(APPEND DIM_INCLUDE_DIRS ${DIM_INCLUDE_DIR} ...)
<br>
LIST(APPEND DIM_LIBRARIES ${DIM_STATIC_LIBRARY} ...)
<br>
ENDIF()
<br>
LIST(REMOVE DIM_FIND_COMPONENTS static)
<br>
UNSET(DIM_FIND_REQUIRED_STATIC)
<br>
ENDIF()
<br>
<br>
# Consider to handle remaining components in DIM_FIND_COMPONENTS.
<br>
<br>
Note that due to the preparatory work on DIM_FIND_COMPONENTS and
the
<br>
DIM_FIND_REQUIRED_* variables, the blocks for enabling the shared
and
<br>
static component have a straight forward structure. Note further
that
<br>
this can be achieved only with a quite simple package like yours
with
<br>
two mutually exclusive libraries; with packages providing more
subtly
<br>
related components - e.g. with inter-component dependencies -
things
<br>
can be much more complicated. Note finally that the user must
issue
<br>
<br>
IF(DIM_FOUND AND DIM_SHARED_FOUND)
<br>
<br>
e.g., in order to check for the library's availability unless the
<br>
REQUIRED flag was given to FIND_PACKAGE(). Checking for DIM_FOUND
<br>
or DIM_SHARED_FOUND alone is *not* reliable, just as referring to
<br>
a component that hasn't been requested explicitly - or enabled by
<br>
default which, in turn, should be documented explicitly.
<br>
<br>
Regards,
<br>
<br>
Michael
<br>
--
<br>
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