[CMake] Double redefinition of commands...

[Theodore Papadopoulo]

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On 05/19/2011 10:14 PM, Alexander Neundorf wrote:
> On Thursday 19 May 2011, Theodore Papadopoulo wrote:
> 
> This feature is not very, let's say polished, so yes, it is not perfect as it 
> is.
> Why do you want do do this ?

Basically, I want find_library to re-run in the case some variables have
been changed. The most common case, is a static/dynamic build.
If the user switches between a static vs dynamic build, I want the
propser static/dynamic libraries to be found. We currently emulate this
with a code such like this:

SET(LIB_TYPE SHARED)

OPTION(BUILD_SHARED_LIBS "Build shared libs" ON)
MARK_AS_ADVANCED(BUILD_SHARED)

IF (BUILD_SHARED)
    SET(LIB_TYPE SHARED)
ELSE()
    SET(LIB_TYPE STATIC)
ENDIF()

STRING(COMPARE NOTEQUAL "${BUILD_SHARED_STATUS}" ""
BUILD_SHARED_STATUS_NOT_EMPTY)
IF(BUILD_SHARED_STATUS_NOT_EMPTY)
    STRING(COMPARE NOTEQUAL "${BUILD_SHARED_STATUS}" "${BUILD_SHARED}"
RESET)
ENDIF()

# Store in cache previous value of BUILD_SHARED
SET(BUILD_SHARED_STATUS "${BUILD_SHARED}" CACHE INTERNAL "Previous
shared status" FORCE)

FUNCTION(FIND_LIBRARY VAR)
    IF(${RESET})
        SET(${VAR} NOTFOUND CACHE STRING "" FORCE)
    ENDIF()
    MESSAGE("HERE")
    _FIND_LIBRARY(${VAR} ${ARGN})
    MARK_AS_ADVANCED(${VAR})
ENDFUNCTION()

... and the idea was to use the standard find_library so as to catch all
the uses of the libraries without having to tell to use our own
version... and that worked quite well untill I had to combine two
projects that define this same macro !!!

> How about adding a "my_find_library()", so you don't have to rename it ?
> In KDE4 we have KDE4_ADD_EXECUTABLE(), KDE4_ADD_LIBRARY() which add some 
> features, and developers who want to make use of this have to use these 
> functions.

Well, I guess I'll have to do something similar. I do not find that
quite robust and efficient, but for the time being that's the best
solution...
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