ci: fix unsetting of VFLAGS in v run ci/linux_ci.vsh v_self_compilation_usecache_clang

Author: spytheman

ci/common/runner.v

@@ -14,6 +14,13 @@ pub fn exec(command string) {
 	}
 }
 
+// unset is a helper function to unset a specific env variable.
+pub fn unset(evar string) {
+	log.info('unsetting env variable: ${evar}')
+	os.unsetenv(evar)
+}
+
+// file_size_greater_than asserts that the given file exists, and is at least min_fsize bytes long.
 pub fn file_size_greater_than(fpath string, min_fsize u64) {
 	log.info('path should exist `${fpath}` ...')
 	if !os.exists(fpath) {

ci/linux_ci.vsh

@@ -1,4 +1,4 @@
-import common { Task, exec }
+import common { Task, exec, unset }
 
 //
 // Shared tasks/helpers
@@ -133,7 +133,7 @@ fn build_fast_tcc() {
 }
 
 fn v_self_compilation_usecache_tcc() {
-	exec('unset VFLAGS')
+	unset('VFLAGS')
 
 	exec('v wipe-cache')
 	exec('v -usecache examples/hello_world.v')
@@ -209,7 +209,7 @@ fn v_self_compilation_gcc() {
 }
 
 fn v_self_compilation_usecache_gcc() {
-	exec('unset VFLAGS')
+	unset('VFLAGS')
 
 	exec('v wipe-cache')
 	exec('v -usecache examples/hello_world.v')
@@ -332,7 +332,7 @@ fn v_self_compilation_clang() {
 }
 
 fn v_self_compilation_usecache_clang() {
-	exec('unset VFLAGS')
+	unset('VFLAGS')
 
 	exec('v wipe-cache')
 	exec('v -usecache examples/hello_world.v')

ci/macos_ci.vsh

@@ -1,4 +1,4 @@
-import common { Task, exec }
+import common { Task, exec, unset }
 
 fn test_symlink() {
 	exec('v symlink')
@@ -98,7 +98,7 @@ fn build_v_with_prealloc() {
 }
 
 fn v_self_compilation_usecache() {
-	exec('unset VFLAGS')
+	unset('VFLAGS')
 	exec('v -usecache examples/hello_world.v')
 	exec('./examples/hello_world')
 	exec('v -o v2 -usecache cmd/v')