Do not install headers when the project is not top-level

Author: madmann91

cmake/Install.cmake

@@ -3,6 +3,14 @@ if (BVH_BUILD_C_API)
     list(APPEND bvh_targets bvh_c)
 endif()
 
+install(
+    DIRECTORY ${PROJECT_SOURCE_DIR}/src/bvh
+    DESTINATION include
+    FILES_MATCHING PATTERN "*.h"
+    PATTERN "c_api" EXCLUDE)
+install(
+    FILES ${PROJECT_SOURCE_DIR}/src/bvh/v2/c_api/bvh.h
+    DESTINATION include/bvh/v2/c_api/)
 install(
     TARGETS ${bvh_targets}
     EXPORT bvh_exports

src/bvh/v2/CMakeLists.txt

@@ -12,12 +12,6 @@ target_include_directories(bvh INTERFACE
 
 set_target_properties(bvh PROPERTIES CXX_STANDARD 20)
 
-install(
-    DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/
-    DESTINATION include/bvh/v2
-    FILES_MATCHING PATTERN "*.h"
-    PATTERN "c_api" EXCLUDE)
-
 if (BVH_BUILD_C_API)
     add_subdirectory(c_api)
 endif()

src/bvh/v2/c_api/CMakeLists.txt

@@ -17,5 +17,3 @@ endif()
 if (BVH_C_API_UNSAFE_CASTS)
     target_compile_definitions(bvh_c PRIVATE -DBVH_C_API_UNSAFE_CASTS)
 endif()
-
-install(FILES bvh.h DESTINATION include/bvh/v2/c_api/)