ci: fix macOS codesigning (#3408)

Signed-off-by: Jared Van Bortel <jared@nomic.ai>

.circleci/continue_config.yml

@@ -85,6 +85,16 @@ jobs:
               -DGPT4ALL_GEN_CPACK_CONFIG=ON
             ~/Qt/Tools/CMake/CMake.app/Contents/bin/cmake --build . --target package
             ~/Qt/Tools/CMake/CMake.app/Contents/bin/cmake . -DGPT4ALL_GEN_CPACK_CONFIG=OFF
+            # The 'install' step here *should* be completely unnecessary. There is absolutely no reason we should have
+            # to copy all of the build artifacts to an output directory that we do not use (because we package GPT4All
+            # as an installer instead).
+            # However, because of the way signing is implemented in the cmake script, the *source* files are signed at
+            # install time instead of the *installed* files. This side effect is the *only* way libraries that are not
+            # processed by macdeployqt, such as libllmodel.so, get signed (at least, with -DBUILD_UNIVERSAL=ON).
+            # Also, we have to run this as a *separate* step. Telling cmake to run both targets in one command causes it
+            # to execute them in parallel, since it is not aware of the dependency of the package target on the install
+            # target.
+            ~/Qt/Tools/CMake/CMake.app/Contents/bin/cmake --build . --target install
             ~/Qt/Tools/CMake/CMake.app/Contents/bin/cmake --build . --target package
             ccache -s
             mkdir upload
@@ -224,6 +234,8 @@ jobs:
               -DGPT4ALL_GEN_CPACK_CONFIG=ON
             ~/Qt/Tools/CMake/CMake.app/Contents/bin/cmake --build . --target package
             ~/Qt/Tools/CMake/CMake.app/Contents/bin/cmake . -DGPT4ALL_GEN_CPACK_CONFIG=OFF
+            # See comment above related to the 'install' target.
+            ~/Qt/Tools/CMake/CMake.app/Contents/bin/cmake --build . --target install
             ~/Qt/Tools/CMake/CMake.app/Contents/bin/cmake --build . --target package
             ccache -s
             mkdir upload

gpt4all-chat/CMakeLists.txt

@@ -10,6 +10,10 @@ set(APP_VERSION "${APP_VERSION_BASE}")
 
 project(gpt4all VERSION ${APP_VERSION_BASE} LANGUAGES CXX C)
 
+if (CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
+  set(CMAKE_INSTALL_PREFIX ${CMAKE_BINARY_DIR}/install CACHE PATH "..." FORCE)
+endif()
+
 if(APPLE)
   option(BUILD_UNIVERSAL "Build a Universal binary on macOS" OFF)
   if(BUILD_UNIVERSAL)
@@ -126,10 +130,6 @@ message(STATUS "Qt 6 root directory: ${Qt6_ROOT_DIR}")
 
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
 
-if (CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
-  set(CMAKE_INSTALL_PREFIX ${CMAKE_BINARY_DIR}/install CACHE PATH "..." FORCE)
-endif()
-
 add_subdirectory(deps)
 add_subdirectory(../gpt4all-backend llmodel)