cmake / _him_fetch_and_compile_plutosvg: build plutovg manually (to a…

…void install, since we link statically)

hello_imgui_cmake/hello_imgui_build_lib.cmake

@@ -461,14 +461,25 @@ function(_him_fetch_and_compile_plutosvg)
     set(backup_build_shared_libs ${BUILD_SHARED_LIBS})
     set(BUILD_SHARED_LIBS OFF)
 
-    # Fetch & build plutovg at configure time
+    # Fetch & build plutovg at configure time, then compile manually at build time
+    # (the stock CMakeLists does install lib/ and include/ although we link to it statically)
     include(FetchContent)
-    FetchContent_Declare(plutovg
+    FetchContent_Populate(plutovg
         GIT_REPOSITORY https://github.com/sammycage/plutovg
         GIT_TAG        v0.0.8
         GIT_PROGRESS TRUE
+        SOURCE_DIR ${CMAKE_BINARY_DIR}/plutovg_source
+        BINARY_DIR ${CMAKE_BINARY_DIR}/plutovg_build
     )
-    FetchContent_MakeAvailable(plutovg)
+    file(GLOB plutovg_sources ${plutovg_SOURCE_DIR}/source/*.c)
+    add_library(plutovg STATIC ${plutovg_sources})
+    target_include_directories(plutovg PUBLIC $<BUILD_INTERFACE:${plutovg_SOURCE_DIR}/include>)
+    find_library(MATH_LIBRARY m)
+    if(MATH_LIBRARY)
+        target_link_libraries(plutovg PRIVATE ${MATH_LIBRARY})
+    endif()
+    him_add_installable_dependency(plutovg)
+
 
     # Fetch plutosvg at configure time, then compile manually at build time
     # (the stock CMakeLists of plutosvg is not compatible with a custom install of freetype)