0003-Fix-dynamic-loading-path-for-OSX.patch

From f227c66273d08b3e0c5e58a5eaf819a033ecb255 Mon Sep 17 00:00:00 2001
From: Nick Overdijk <nick.overdijk@circlecvi.com>
Date: Mon, 23 Mar 2020 09:59:16 +0100
Subject: [PATCH] Fix dynamic loading path for OSX

This commit sets the INSTALL_RPATH to $ORIGIN on not OSX, or the
OSX-sort-of-equivalent @loader_path. It tells the dynamic loader to
check the path 'from the binary directory to the library directory'.
This fixes not being able to find IrrXML.dylib when things are not
installed to a default location. This fixes issue
https://github.com/assimp/assimp/issues/2872 for me.

The patch is pretty much straight from the book 'professional cmake'.
---
 CMakeLists.txt | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index dcafb649f5..9faa2ae489 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -163,6 +163,16 @@ IF(NOT BUILD_SHARED_LIBS)
   SET(LINK_SEARCH_START_STATIC TRUE)
 ELSE()
   MESSAGE(STATUS "Shared libraries enabled")
+  IF(APPLE)
+      SET(basePoint @loader_path)
+    ELSE()
+        SET(basePoint $ORIGIN)
+  ENDIF()
+  FILE(RELATIVE_PATH relDir
+    ${CMAKE_CURRENT_BINARY_DIR}/${ASSIMP_BIN_INSTALL_DIR}
+    ${CMAKE_CURRENT_BINARY_DIR}/${ASSIMP_LIB_INSTALL_DIR}
+  )
+  SET(CMAKE_INSTALL_RPATH ${basePoint} ${basePoint}/${relDir})
 ENDIF(NOT BUILD_SHARED_LIBS)
 
 # Define here the needed parameters