From 652fbc200500497a67bd11d18b786587ba34e3d9 Mon Sep 17 00:00:00 2001
From: Ankit Meel <ankitjmeel@gmail.com>
Date: Tue, 3 Aug 2021 20:49:40 +0530
Subject: macOS: Portable builds with dynamic libraries.

For Blender.app: dropping libomp.dylib next to Blender executable is
enough for it getting picked up since `@executable_path` is an rpath.

For non-distributed binaries datatoc, makesdna, tests etc, code for
copying libomp.dylib to build folder is removed and replaced by
CMake's rpath option for *build* tree.

For bpy.so, the post build rpath change has also been replaced by CMake
rpath option for *install* tree.

Since -id has been changed in D11748, remove the
`install_name_tool -change ...` command.

Any dylib can just be dropped at `MAC_BLENDER_TARGET_DYLIBS_DIR`
hereafter. Appending dylib path to `CMAKE_BUILD_RPATH` will be needed
for datatoc etc if linked against one (instead of copying the
dylibs around).

Reviewed By: #platform_macos, brecht
Differential Revision: https://developer.blender.org/D11997
---
 build_files/cmake/platform/platform_apple.cmake | 38 ++++++++++++-------------
 1 file changed, 19 insertions(+), 19 deletions(-)

(limited to 'build_files')

diff --git a/build_files/cmake/platform/platform_apple.cmake b/build_files/cmake/platform/platform_apple.cmake
index 70973eeda99..529c01db009 100644
--- a/build_files/cmake/platform/platform_apple.cmake
+++ b/build_files/cmake/platform/platform_apple.cmake
@@ -411,25 +411,9 @@ if(WITH_OPENMP)
     set(OPENMP_FOUND ON)
     set(OpenMP_C_FLAGS "-Xclang -fopenmp -I'${LIBDIR}/openmp/include'")
     set(OpenMP_CXX_FLAGS "-Xclang -fopenmp -I'${LIBDIR}/openmp/include'")
-    set(OpenMP_LINKER_FLAGS "-L'${LIBDIR}/openmp/lib' -lomp")
-
-    # Copy libomp.dylib to allow executables like datatoc and tests to work.
-    # `@executable_path/../Resources/lib/` `LC_ID_DYLIB` is added by the deps builder.
-    # For single config generator datatoc, tests etc.
-    execute_process(
-      COMMAND mkdir -p ${CMAKE_BINARY_DIR}/Resources/lib
-      COMMAND cp -p ${LIBDIR}/openmp/lib/libomp.dylib ${CMAKE_BINARY_DIR}/Resources/lib/libomp.dylib
-    )
-    # For multi-config generator datatoc, etc.
-    execute_process(
-      COMMAND mkdir -p ${CMAKE_BINARY_DIR}/bin/Resources/lib
-      COMMAND cp -p ${LIBDIR}/openmp/lib/libomp.dylib ${CMAKE_BINARY_DIR}/bin/Resources/lib/libomp.dylib
-    )
-    # For multi-config generator tests.
-    execute_process(
-      COMMAND mkdir -p ${CMAKE_BINARY_DIR}/bin/tests/Resources/lib
-      COMMAND cp -p ${LIBDIR}/openmp/lib/libomp.dylib ${CMAKE_BINARY_DIR}/bin/tests/Resources/lib/libomp.dylib
-    )
+    set(OpenMP_LIBRARY_DIR "${LIBDIR}/openmp/lib/")
+    set(OpenMP_LINKER_FLAGS "-L'${OpenMP_LIBRARY_DIR}' -lomp")
+    set(OpenMP_LIBRARY "${OpenMP_LIBRARY_DIR}/libomp.dylib")
   endif()
 endif()
 
@@ -511,3 +495,19 @@ if(WITH_COMPILER_CCACHE)
     endif()
   endif()
 endif()
+
+# For binaries that are built but not installed (also not distributed) (datatoc,
+# makesdna, tests, etc.), we add an rpath to the OpenMP library dir through
+# CMAKE_BUILD_RPATH. This avoids having to make many copies of the dylib next to each binary.
+#
+# For the installed Blender executable, CMAKE_INSTALL_RPATH will be used, but
+# needs no changes since it already looks for dylibs next to the executable by
+# default (@executable_path).
+#
+# For the installed Python module, CMAKE_INSTALL_RPATH is modified to find the
+# dylib in an adjacent folder.
+set(CMAKE_SKIP_BUILD_RPATH FALSE)
+list(APPEND CMAKE_BUILD_RPATH "${OpenMP_LIBRARY_DIR}")
+if(WITH_PYTHON_MODULE)
+  list(APPEND CMAKE_INSTALL_RPATH "@loader_path/../Resources/${BLENDER_VERSION}/lib")
+endif()
-- 
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