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# - Find ltdl header and library
#
# This module defines
# LTDL_FOUND, if false, do not try to use LTDL.
# LTDL_INCLUDE_DIR, where to find ltdl.h.
# LTDL_LIBRARIES, the libraries to link against to use libltdl.
# LTDL_LIBRARY_DIR, the directory where libltdl is found.
find_path(LTDL_INCLUDE_DIR ltdl.h /usr/local/include /usr/include)
if(LTDL_INCLUDE_DIR)
find_library(LTDL_LIBRARIES
NAMES ltdl
PATHS /usr/local/lib /usr/lib
)
if(LTDL_LIBRARIES)
set(LTDL_LIBRARY_DIR "")
get_filename_component(LTDL_LIBRARY_DIR ${LTDL_LIBRARIES} PATH)
# Define useful internal macro for finding and checking a library
include(CheckLibraryExists)
macro(_find_check_libs _library_name _function_name _lib _have_lib)
find_library(
${_lib}
NAMES ${_library_name}
PATHS /usr/local/lib /usr/lib
)
# message("_library_name = ${_library_name}")
# message("${_lib} = ${${_lib}}")
if(${_lib})
get_filename_component(_path ${${_lib}} PATH)
check_library_exists(
${_library_name}
${_function_name}
${_path}
${_have_lib}
)
endif(${_lib})
endmacro(_find_check_libs)
# Find and check platform-dependent libraries which
# libltdl depends upon using model given
# for determining LIBADD_DL in $prefix/share/libtool/libltdl/acinclude.m4
# Look for three exclusive alternatives:
# (dld shl_load; dl dlopen; svdl dlopen)
# N.B. all the different ADDLIB variables have to be different because
# of caching of results in the macro.
_find_check_libs(dld shl_load LTDL_LTDL_ADDLIB0 LTDL_LTDL_HAVE_ADDLIB0)
if(LTDL_LTDL_HAVE_ADDLIB0)
set(LTDL_LIBRARIES ${LTDL_LIBRARIES} ${LTDL_LTDL_ADDLIB0})
set(LTDL_FOUND ON)
else(LTDL_LTDL_HAVE_ADDLIB0)
_find_check_libs(dl dlopen LTDL_LTDL_ADDLIB1 LTDL_LTDL_HAVE_ADDLIB1)
if(LTDL_LTDL_HAVE_ADDLIB1)
set(LTDL_LIBRARIES ${LTDL_LIBRARIES} ${LTDL_LTDL_ADDLIB1})
set(LTDL_FOUND ON)
else(LTDL_LTDL_HAVE_ADDLIB1)
_find_check_libs(svdl dlopen LTDL_LTDL_ADDLIB2 LTDL_LTDL_HAVE_ADDLIB2)
if(LTDL_LTDL_HAVE_ADDLIB2)
set(LTDL_LIBRARIES ${LTDL_LIBRARIES} ${LTDL_LTDL_ADDLIB2})
set(LTDL_FOUND ON)
else(LTDL_LTDL_HAVE_ADDLIB2)
set(LTDL_FOUND OFF)
endif(LTDL_LTDL_HAVE_ADDLIB2)
endif(LTDL_LTDL_HAVE_ADDLIB1)
endif(LTDL_LTDL_HAVE_ADDLIB0)
# (dld dld_link) appended to any that have been found before.
_find_check_libs(dld dld_link LTDL_LTDL_ADDLIB3 LTDL_LTDL_HAVE_ADDLIB3)
if(LTDL_LTDL_HAVE_ADDLIB3)
set(LTDL_LIBRARIES ${LTDL_LIBRARIES} ${LTDL_LTDL_ADDLIB3})
set(LTDL_FOUND ON)
endif(LTDL_LTDL_HAVE_ADDLIB3)
endif(LTDL_LIBRARIES)
endif(LTDL_INCLUDE_DIR)
if(LTDL_FOUND)
if(NOT LTDL_FIND_QUIETLY)
message(STATUS "Found LTDL: ${LTDL_LIBRARIES}")
endif(NOT LTDL_FIND_QUIETLY)
else(LTDL_FOUND)
if(LTDL_FIND_REQUIRED)
message(FATAL_ERROR "Could not find LTDL library")
endif(LTDL_FIND_REQUIRED)
endif(LTDL_FOUND)
mark_as_advanced(
LTDL_LTDL_ADDLIB0 LTDL_LTDL_HAVE_ADDLIB0
LTDL_LTDL_ADDLIB1 LTDL_LTDL_HAVE_ADDLIB1
LTDL_LTDL_ADDLIB2 LTDL_LTDL_HAVE_ADDLIB2
LTDL_LTDL_ADDLIB3 LTDL_LTDL_HAVE_ADDLIB3
)
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