ld -r -b binary cat.png -o cat.o

[trsh]

Can we do this with emcc?

I am referencing: https://csl.name/post/embedding-binary-data/

[sbc100]

That particular method is not currently supported by wasm-ld, no. The version that uses assembly language does work though. For an example of how to do that see the package manager:

emscripten/tools/file_packager.py

Lines 278 to 323 in c93b3a1

	out.write(dedent(f'''
	.section .rodata.{f.c_symbol_name},"",@
	# The name of file
	{f.c_symbol_name}_name:
	.asciz "{dstpath}"
	.size {f.c_symbol_name}_name, {len(dstpath)+1}
	# The size of the file followed by the content itself
	{f.c_symbol_name}:
	.incbin "{srcpath}"
	.size {f.c_symbol_name}, {size}
	'''))
	if options.wasm64:
	align = 3
	ptr_type = 'i64'
	bits = 64
	else:
	align = 2
	ptr_type = 'i32'
	bits = 32
	out.write(dedent(f'''
	.functype _emscripten_fs_load_embedded_files ({ptr_type}) -> ()
	.section .text,"",@
	init_file_data:
	.functype init_file_data () -> ()
	global.get __emscripten_embedded_file_data@GOT
	call _emscripten_fs_load_embedded_files
	end_function
	# Run init_file_data on startup.
	# See system/lib/README.md for ordering of system constructors.
	.section .init_array.49,"",@
	.p2align {align}
	.int{bits} init_file_data
	# A list of triples of:
	# (file_name_ptr, file_data_size, file_data_ptr)
	# The list in null terminate with a single 0
	.globl __emscripten_embedded_file_data
	.export_name __emscripten_embedded_file_data, __emscripten_embedded_file_data
	.section .rodata.__emscripten_embedded_file_data,"",@
	__emscripten_embedded_file_data:
	.p2align {align}
	'''))

Its conceivable we could add support to wasm-ld.. but the .s file is probably a better solution for now.

[sbc100]

Actually it looks like lld for ELF doesn't support -b binary either, so its unlikely it would make sense to add this to wasm-ld

[trsh]

Thank you. But I don't really understand the .py script.