$NetBSD: patch-CMakeLists.txt,v 1.2 2021/06/10 12:26:26 nia Exp $

Fix detection of dlopen
https://github.com/pocl/pocl/pull/950

--- CMakeLists.txt.orig	2021-05-19 08:12:19.000000000 +0000
+++ CMakeLists.txt
@@ -787,9 +787,7 @@ elseif(UNIX)
 
     find_library(DL_LIB "dl")
     find_file(DL_H "dlfcn.h")
-    if(DL_LIB AND DL_H)
-      message(STATUS "libdl found")
-
+    if(DL_H)
       get_filename_component(DL_H_INCLUDE_DIR "${DL_H}" DIRECTORY)
       string(FIND "${CMAKE_C_IMPLICIT_INCLUDE_DIRECTORIES}" "${DL_H_INCLUDE_DIR}" LTPOSITION)
       # include the directory of dlfcn.h, if its not in the default system include dirs
@@ -797,9 +795,11 @@ elseif(UNIX)
       if((LTPOSITION LESS "0") AND (NOT CMAKE_CROSSCOMPILING))
         include_directories("${DL_H_INCLUDE_DIR}")
       endif()
-      set(HAVE_LIBDL ON CACHE BOOL "dlopen" FORCE)
-    else()
-      message(FATAL_ERROR "Could not find DL library!")
+      set(HAVE_DLFCN_H ON)
+    endif()
+
+    if(NOT DL_LIB)
+      set(DL_LIB "")
     endif()
 
 else()