pref: support file_notd_freestanding.v + file_d_freestanding.v, remov…

…e dependency to `os`, of $embed_file(), when compiling with -freestanding (#20712)

vlib/v/embed_file/embed_file.v

@@ -1,7 +1,5 @@
 module embed_file
 
-import os
-
 pub const is_used = 1
 
 // EmbedFileData encapsulates functionality for the `$embed_file()` compile time call.
@@ -71,18 +69,9 @@ pub fn (mut ed EmbedFileData) data() &u8 {
 			ed.uncompressed = &u8(memdup(decompressed.data, ed.len))
 		}
 	} else {
-		mut path := os.resource_abs_path(ed.path)
-		if !os.is_file(path) {
-			path = ed.apath
-			if !os.is_file(path) {
-				panic('EmbedFileData error: files "${ed.path}" and "${ed.apath}" do not exist')
-			}
-		}
-		bytes := os.read_bytes(path) or {
-			panic('EmbedFileData error: "${path}" could not be read: ${err}')
+		$if !freestanding {
+			reload_from_file_at_runtime(mut ed)
 		}
-		ed.uncompressed = bytes.data
-		ed.free_uncompressed = true
 	}
 	return ed.uncompressed
 }

vlib/v/embed_file/embed_file_d_freestanding.v

@@ -0,0 +1,5 @@
+module embed_file
+
+// do nothing, `os` is not available for that target
+fn reload_from_file_at_runtime(mut ed EmbedFileData) {
+}

vlib/v/embed_file/embed_file_notd_freestanding.v

@@ -0,0 +1,18 @@
+module embed_file
+
+import os
+
+fn reload_from_file_at_runtime(mut ed EmbedFileData) {
+	mut path := os.resource_abs_path(ed.path)
+	if !os.is_file(path) {
+		path = ed.apath
+		if !os.is_file(path) {
+			panic('EmbedFileData error: files "${ed.path}" and "${ed.apath}" do not exist')
+		}
+	}
+	bytes := os.read_bytes(path) or {
+		panic('EmbedFileData error: "${path}" could not be read: ${err}')
+	}
+	ed.uncompressed = bytes.data
+	ed.free_uncompressed = true
+}

vlib/v/gen/c/coutput_test.v

@@ -17,6 +17,8 @@ const show_compilation_output = os.getenv('VTEST_SHOW_COMPILATION_OUTPUT').int()
 
 const user_os = os.user_os()
 
+const gcc_path = os.find_abs_path_of_executable('gcc') or { '' }
+
 fn mm(s string) string {
 	return term.colorize(term.magenta, s)
 }
@@ -253,5 +255,15 @@ fn should_skip(relpath string) bool {
 			return true
 		}
 	}
+	if relpath.contains('freestanding_module_import_') {
+		if user_os != 'linux' {
+			eprintln('> skipping ${relpath} on != linux')
+			return true
+		}
+		if gcc_path == '' {
+			eprintln('> skipping ${relpath} since it needs gcc, which is not detected')
+			return true
+		}
+	}
 	return false
 }

vlib/v/gen/c/testdata/freestanding_define/a_d_freestanding.c.v

@@ -0,0 +1,8 @@
+module freestanding_define
+
+const f = $embed_file(@FILE).len
+
+pub fn hi() {
+	println('hi from a_d_freestanding.c.v')
+	println('f.len: ${freestanding_define.f}')
+}

vlib/v/gen/c/testdata/freestanding_define/a_notd_freestanding.c.v

@@ -0,0 +1,8 @@
+module freestanding_define
+
+const f = $embed_file(@FILE).len
+
+pub fn hi() {
+	println('hi from a_notd_freestanding.c.v')
+	println('f.len: ${freestanding_define.f}')
+}

vlib/v/gen/c/testdata/freestanding_module_import_1.out

@@ -0,0 +1,2 @@
+hi from a_notd_freestanding.c.v
+f.len: 166

vlib/v/gen/c/testdata/freestanding_module_import_1.vv

@@ -0,0 +1,4 @@
+// vtest vflags: -cc gcc
+import v.gen.c.testdata.freestanding_define
+
+freestanding_define.hi()

vlib/v/gen/c/testdata/freestanding_module_import_2.out

@@ -0,0 +1,2 @@
+hi from a_d_freestanding.c.v
+f.len: 163

vlib/v/gen/c/testdata/freestanding_module_import_2.vv

@@ -0,0 +1,4 @@
+// vtest vflags: -cc gcc -freestanding
+import v.gen.c.testdata.freestanding_define
+
+freestanding_define.hi()

vlib/v/pref/pref.c.v

@@ -1043,6 +1043,11 @@ pub fn parse_args_and_show_errors(known_external_commands []string, args []strin
 		res.compile_defines << 'musl'
 		res.compile_defines_all << 'musl'
 	}
+	if res.is_bare {
+		// make `$if freestanding? {` + file_freestanding.v + file_notd_freestanding.v work:
+		res.compile_defines << 'freestanding'
+		res.compile_defines_all << 'freestanding'
+	}
 	if 'callstack' in res.compile_defines_all {
 		res.is_callstack = true
 	}