Move embed utility to a separate project.

This has to be separate to build a host executable during cross-compilation
(e.g. on emscripten builds).

profiler/CMakeLists.txt

@@ -32,7 +32,13 @@ include(${CMAKE_CURRENT_LIST_DIR}/../cmake/config.cmake)
 include(${CMAKE_CURRENT_LIST_DIR}/../cmake/vendor.cmake)
 include(${CMAKE_CURRENT_LIST_DIR}/../cmake/server.cmake)
 
-add_executable(embed src/helpers/embed.cpp ../public/common/tracy_lz4.cpp ../public/common/tracy_lz4hc.cpp)
+include(ExternalProject)
+ExternalProject_Add(embed
+    SOURCE_DIR ${CMAKE_CURRENT_LIST_DIR}/helpers
+    CMAKE_ARGS
+        -DCMAKE_BUILD_TYPE=Release
+        -DCMAKE_INSTALL_PREFIX=${CMAKE_CURRENT_BINARY_DIR}
+)
 
 add_custom_command(
     OUTPUT data
@@ -42,8 +48,8 @@ add_custom_command(
 function(Embed LIST NAME FILE)
     add_custom_command(
         OUTPUT data/${NAME}.cpp data/${NAME}.hpp
-        COMMAND embed ${NAME} ${CMAKE_CURRENT_LIST_DIR}/${FILE} data/${NAME}
-        DEPENDS data embed ${CMAKE_CURRENT_LIST_DIR}/${FILE}
+        COMMAND ${CMAKE_CURRENT_BINARY_DIR}/embed ${NAME} ${CMAKE_CURRENT_LIST_DIR}/${FILE} data/${NAME}
+        DEPENDS data ${CMAKE_CURRENT_BINARY_DIR}/embed ${CMAKE_CURRENT_LIST_DIR}/${FILE}
     )
     list(APPEND ${LIST} data/${NAME}.cpp)
     return(PROPAGATE ${LIST})

profiler/helpers/CMakeLists.txt

@@ -0,0 +1,13 @@
+cmake_minimum_required(VERSION 3.16)
+
+set(CMAKE_CXX_STANDARD 20)
+
+project(helpers LANGUAGES CXX)
+
+add_executable(embed
+    ../../public/common/tracy_lz4.cpp
+    ../../public/common/tracy_lz4hc.cpp
+    embed.cpp
+)
+
+install(TARGETS embed DESTINATION .)