I used a list
to store names of libraries, and I would like to use foreach
and find_library
to find full path of each library. But find_library
just returned the path of the first library. I checked this post, but problem still exist. My CMake version is 3.4.3.
SET(VTKLIBS_DIR)
FOREACH(LIB ${VTKLIBS})
SET(FOUND_LIB)
FIND_LIBRARY(FOUND_LIB ${LIB})
LIST(APPEND VTKLIBS_DIR ${FOUND_LIB})
MESSAGE("Lib: ${LIB}")
MESSAGE("Found Lib: ${FOUND_LIB}")
UNSET(FOUND_LIB)
ENDFOREACH(LIB)
Command find_library
sets cached variable, but simple form of command unset
remove only simple variable's definition.
As noted by the link you provide, you need to store special value FOUND_LIB-NOTFOUND
to the variable FOUND_LIB
for force find_library
to search another library while variable already contains path to the previous library:
FOREACH(LIB ${VTKLIBS})
SET(FOUND_LIB "FOUND_LIB-NOTFOUND")
FIND_LIBRARY(FOUND_LIB ${LIB})
LIST(APPEND VTKLIBS_DIR ${FOUND_LIB})
MESSAGE("Lib: ${LIB}")
MESSAGE("Found Lib: ${FOUND_LIB}")
ENDFOREACH(LIB)
Actually, this is some kind of trick, as cached variable FOUND_LIB
isn't changed by simple set
command. But when find_library
implementation attempts to read cached value of the variable, it actually read value of simple variable with the same name.
Because find_library
treats only *-NOTFOUND
cached values as "library not found", your trick with assigning empty value to the variable doesn't work.
The better approach, as noted by @arrowd, would be using different names for variable, used in different find_library()
call:
FOREACH(LIB ${VTKLIBS})
FIND_LIBRARY(FOUND_LIB_${LIB} ${LIB})
LIST(APPEND VTKLIBS_DIR ${FOUND_LIB_${LIB}})
MESSAGE("Lib: ${LIB}")
MESSAGE("Found Lib: ${FOUND_LIB_${LIB}}")
ENDFOREACH(LIB)
Such a way results for every find_library
call will be stored separately, and the same library will not be searched again at the next time cmake being invoked. Also, such approach allows user to modify (in cache) paths to concrete libraries without affecting other ones.
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