cmake: mtmd: install PUBLIC_HEADERs and allow static linking

Separates out header installation and performs it regardless of build shared libs or not.
Returns mtmd objects to STATIC, installing those if BUILD_SHARED_LIBS is off.
This should allow for static linking without breaking build encapsulation or visibility, and install the headers as before for shared libs.

Author: 65a

tools/mtmd/CMakeLists.txt

@@ -1,6 +1,6 @@
 # mtmd
 
-add_library(mtmd OBJECT
+add_library(mtmd STATIC
             mtmd.cpp
             mtmd-audio.cpp
             mtmd.h
@@ -9,23 +9,32 @@ add_library(mtmd OBJECT
             clip-impl.h
             )
 
+set(MTMD_PUBLIC_HEADERS
+    "mtmd.h"
+    "clip.h")
+
 target_link_libraries(mtmd PRIVATE ggml llama ${CMAKE_THREAD_LIBS_INIT})
 target_include_directories(mtmd PUBLIC .)
 target_include_directories(mtmd PRIVATE ../..)
 target_compile_features(mtmd PRIVATE cxx_std_17)
+set_target_properties(mtmd PROPERTIES PUBLIC_HEADER "${MTMD_PUBLIC_HEADERS}")
 
 # compile the helper separately, to avoid long compile times with miniaudio.h and stb_image.h
 
-add_library(mtmd_helper OBJECT
+add_library(mtmd_helper STATIC
             mtmd-helper.cpp
             mtmd-helper.h
             )
 
+set(MTMD_HELPER_PUBLIC_HEADERS
+    "mtmd-helper.h")
+
 target_link_libraries(mtmd_helper PRIVATE ggml llama mtmd ${CMAKE_THREAD_LIBS_INIT})
 target_include_directories(mtmd_helper PUBLIC .)
 target_include_directories(mtmd_helper PRIVATE ./vendor)
 target_include_directories(mtmd_helper PRIVATE ../..)
 target_compile_features(mtmd_helper PRIVATE cxx_std_17)
+set_target_properties(mtmd_helper PROPERTIES PUBLIC_HEADER "${MTMD_HELPER_PUBLIC_HEADERS}")
 
 if (BUILD_SHARED_LIBS)
     set_target_properties(mtmd PROPERTIES POSITION_INDEPENDENT_CODE ON)
@@ -39,7 +48,12 @@ if (BUILD_SHARED_LIBS)
     add_library(mtmd_helper_shared SHARED $<TARGET_OBJECTS:mtmd>)
     target_link_libraries(mtmd_helper_shared PRIVATE ggml llama mtmd ${CMAKE_THREAD_LIBS_INIT})
     install(TARGETS mtmd_helper_shared LIBRARY)
+else()
+    install(TARGETS mtmd LIBRARY)
+    install(TARGETS mtmd_helper LIBRARY)
 endif()
+install(TARGETS mtmd PUBLIC_HEADER)
+install(TARGETS mtmd_helper PUBLIC_HEADER)
 
 if (NOT MSVC)
     # for stb_image.h and miniaudio.h