tools: cleanup generated executables by `v test-all`

.gitignore

@@ -23,6 +23,8 @@ a.out
 /v.c
 /v.*.c
 /v.c.out
+/v_old
+/v_old.exe
 .vrepl_temp.v
 fns.txt
 .noprefix.vrepl_temp.v

cmd/tools/vtest-all.v

@@ -4,12 +4,15 @@ import os
 import term
 import time
 
-const (
-	vexe        = os.getenv('VEXE')
-	vroot       = os.dir(vexe)
-	args_string = os.args[1..].join(' ')
-	vargs       = args_string.all_before('test-all')
-)
+const vexe = os.getenv('VEXE')
+
+const vroot = os.dir(vexe)
+
+const args_string = os.args[1..].join(' ')
+
+const vargs = args_string.all_before('test-all')
+
+const vtest_nocleanup = os.getenv('VTEST_NOCLEANUP').bool()
 
 fn main() {
 	mut commands := get_all_commands()
@@ -44,6 +47,7 @@ mut:
 	ecode  int
 	okmsg  string
 	errmsg string
+	rmfile string
 }
 
 fn get_all_commands() []Command {
@@ -51,26 +55,32 @@ fn get_all_commands() []Command {
 	res << Command{
 		line: '$vexe examples/hello_world.v'
 		okmsg: 'V can compile hello world.'
+		rmfile: 'examples/hello_world'
 	}
 	res << Command{
 		line: '$vexe -o vtmp cmd/v'
 		okmsg: 'V can compile itself.'
+		rmfile: 'vtmp'
 	}
 	res << Command{
 		line: '$vexe -o vtmp_werror -cstrict cmd/v'
 		okmsg: 'V can compile itself with -cstrict.'
+		rmfile: 'vtmp_werror'
 	}
 	res << Command{
 		line: '$vexe -o vtmp_autofree -autofree cmd/v'
 		okmsg: 'V can compile itself with -autofree.'
+		rmfile: 'vtmp_autofree'
 	}
 	res << Command{
 		line: '$vexe -o vtmp_prealloc -prealloc cmd/v'
 		okmsg: 'V can compile itself with -prealloc.'
+		rmfile: 'vtmp_prealloc'
 	}
 	res << Command{
 		line: '$vexe -o vtmp_unused -skip-unused cmd/v'
 		okmsg: 'V can compile itself with -skip-unused.'
+		rmfile: 'vtmp_unused'
 	}
 	res << Command{
 		line: '$vexe $vargs -progress test-cleancode'
@@ -107,12 +117,14 @@ fn get_all_commands() []Command {
 	res << Command{
 		line: '$vexe -usecache examples/tetris/tetris.v'
 		okmsg: '`v -usecache` works.'
+		rmfile: 'examples/tetris/tetris'
 	}
 	$if macos {
 		res << Command{
 			line: '$vexe -o v.c cmd/v && cc -Werror v.c && rm -rf v.c'
 			label: 'v.c should be buildable with no warnings...'
 			okmsg: 'v.c can be compiled without warnings. This is good :)'
+			rmfile: 'v.c'
 		}
 	}
 	return res
@@ -129,6 +141,15 @@ fn (mut cmd Command) run() {
 	cmd.ecode = os.system(cmd.line)
 	spent := sw.elapsed().milliseconds()
 	println(term_highlight('> Running: "$cmd.line" took: $spent ms.'))
+	if vtest_nocleanup {
+		return
+	}
+	if cmd.rmfile != '' {
+		os.rm(cmd.rmfile) or {}
+		if os.user_os() == 'windows' {
+			os.rm(cmd.rmfile + '.exe') or {}
+		}
+	}
 }
 
 fn term_highlight(s string) string {