added copy step for embedded resources to limit symbol name length. wrapped add resource functionality into a cmake function for easy use.

CMakeLists.txt

@@ -10,6 +10,24 @@ set(CMAKE_CXX_STANDARD 17)
 # Initialize the SDK
 pico_sdk_init()
 
+function(add_resource target file)
+  get_filename_component(NAME ${ARGV1} NAME_WE)
+  set(FILENAME ${ARGV1})
+
+  add_custom_command(
+    OUTPUT ${NAME}.o
+
+    COMMAND ${CMAKE_COMMAND} -E copy
+            ${CMAKE_CURRENT_SOURCE_DIR}/${FILENAME}
+            ${CMAKE_CURRENT_BINARY_DIR}
+
+    COMMAND arm-none-eabi-ld -r -b binary -o ${NAME}.o ${FILENAME}
+    DEPENDS ${FILENAME}
+  )
+
+  target_sources(${ARGV0} PRIVATE ${NAME}.o)
+endfunction(add_resource)
+
 add_subdirectory(drivers)
 add_subdirectory(libraries)
 

examples/pico_explorer/CMakeLists.txt

@@ -1,17 +1,12 @@
-add_custom_command(
-  OUTPUT fox.o
-  COMMAND arm-none-eabi-ld -r -b binary -o fox.o ${CMAKE_CURRENT_SOURCE_DIR}/fox.tga
-  DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/fox.tga
-)
-
 add_executable(
   explorer
   demo.cpp
-  fox.o
 )
 
+add_resource(explorer fox.tga)
+
 # Pull in pico libraries that we need
 target_link_libraries(explorer pico_stdlib pico_explorer msa301)
 
 # create map/bin/hex file etc.
-pico_add_extra_outputs(explorer)
+pico_add_extra_outputs(explorer)

examples/pico_explorer/demo.cpp

@@ -8,10 +8,7 @@
 
 using namespace pimoroni;
 
-extern unsigned char image_tif[];
-extern unsigned int image_tif_len;
-
-extern unsigned char _binary__home_jon_pimoroni_pico_examples_pico_explorer_fox_tga_start[];
+extern unsigned char _binary_fox_tga_start[];
 
 PicoExplorer pico_explorer;
 MSA301 msa301;
@@ -147,7 +144,7 @@ int main() {
     yoff += 120 - (68 / 2);
     for(int y = 0; y < 68; y++) {
       uint16_t *dest = pico_explorer.frame_buffer + (y * 240);
-      uint8_t *src = _binary__home_jon_pimoroni_pico_examples_pico_explorer_fox_tga_start + 18 + (y * 81 * 3);
+      uint8_t *src = _binary_fox_tga_start + 18 + (y * 81 * 3);
       for(int x = 0; x < 81; x++) {
         uint8_t r = *src++;
         uint8_t g = *src++;