dl: move 'example' to 'examples/dynamic_library_loading' (#9187)

vlib/dl/example/library.v

@@ -1,19 +0,0 @@
-module library
-
-// add_1 is exported with the C name `add_1`.
-// It can be called by external programs, when the module is compiled
-// as a shared library.
-// It is exported, because the function is declared as public with `pub`.
-// The exported C name is `add_1`, because of the export: tag.
-// (Normally, the exported name is a V mangled version based on the module
-// name followed by __, followed by the fn name, i.e. it would have been
-// `library__add_1`, if not for the export: tag).
-[export: 'add_1']
-pub fn add_1(x int, y int) int {
-	return my_private_function(x + y)
-}
-
-// this function is not exported and will not be visible to external programs.
-fn my_private_function(x int) int {
-	return 1 + x
-}

vlib/dl/example/use.v

@@ -1,17 +0,0 @@
-module main
-
-import os
-import dl
-
-type FNAdder = fn (int, int) int
-
-fn main() {
-	library_file_path := os.join_path(os.getwd(), dl.get_libname('library'))
-	handle := dl.open(library_file_path, dl.rtld_lazy)
-	eprintln('handle: ${ptr_str(handle)}')
-	mut f := &FNAdder(0)
-	f = dl.sym(handle, 'add_1')
-	eprintln('f: ${ptr_str(f)}')
-	res := f(1, 2)
-	eprintln('res: $res')
-}

vlib/dl/example/use_test.v

@@ -1,52 +0,0 @@
-module main
-
-import os
-import dl
-
-const (
-	vexe              = os.real_path(os.getenv('VEXE'))
-	cfolder           = os.dir(@FILE)
-	so_ext            = dl.dl_ext
-	library_file_name = os.join_path(cfolder, dl.get_libname('library'))
-)
-
-fn test_vexe() {
-	eprintln('vexe: $vexe')
-	assert vexe != ''
-	eprintln('os.executable: ' + os.executable())
-	eprintln('@FILE: ' + @FILE)
-	eprintln('cfolder: $cfolder')
-	eprintln('so_ext: $so_ext')
-	eprintln('library_file_name: $library_file_name')
-}
-
-fn test_can_compile_library() {
-	os.chdir(cfolder)
-	os.rm(library_file_name) or { }
-	res := v_compile('-d no_backtrace -o library -shared library.v')
-	eprintln('res: $res')
-	assert os.is_file(library_file_name)
-}
-
-fn test_can_compile_main_program() {
-	os.chdir(cfolder)
-	assert os.is_file(library_file_name)
-	result := v_compile('run use.v')
-	eprintln('result: $result')
-	assert result.output.contains('res: 4')
-	os.rm(library_file_name) or { }
-}
-
-fn v_compile(vopts string) os.Result {
-	cmd := '"$vexe" -showcc $vopts'
-	eprintln('>>> v_compile cmd: $cmd')
-	res := os.exec(cmd) or { panic(err) }
-	eprintln('>>> v_compile res: $res')
-	// assert res.exit_code == 0
-	$if !windows {
-		os.system('ls -al $cfolder')
-	} $else {
-		os.system('dir $cfolder /a')
-	}
-	return res
-}