[src/trunk]: src/usr.bin/make make(1): extend the documentation for variable ...

[rillig <rillig%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/fba9e08dc4be
branches:  trunk
changeset: 936951:fba9e08dc4be
user:      rillig <rillig%NetBSD.org@localhost>
date:      Sun Aug 09 11:04:05 2020 +0000

description:
make(1): extend the documentation for variable flags

diffstat:

 usr.bin/make/var.c |  46 +++++++++++++++++++++++++++-------------------
 1 files changed, 27 insertions(+), 19 deletions(-)

diffs (80 lines):

diff -r faca8c1a1435 -r fba9e08dc4be usr.bin/make/var.c
--- a/usr.bin/make/var.c        Sun Aug 09 10:24:02 2020 +0000
+++ b/usr.bin/make/var.c        Sun Aug 09 11:04:05 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: var.c,v 1.439 2020/08/09 09:44:14 rillig Exp $ */
+/*     $NetBSD: var.c,v 1.440 2020/08/09 11:04:05 rillig Exp $ */
 
 /*
  * Copyright (c) 1988, 1989, 1990, 1993
@@ -69,14 +69,14 @@
  */
 
 #ifndef MAKE_NATIVE
-static char rcsid[] = "$NetBSD: var.c,v 1.439 2020/08/09 09:44:14 rillig Exp $";
+static char rcsid[] = "$NetBSD: var.c,v 1.440 2020/08/09 11:04:05 rillig Exp $";
 #else
 #include <sys/cdefs.h>
 #ifndef lint
 #if 0
 static char sccsid[] = "@(#)var.c      8.3 (Berkeley) 3/19/94";
 #else
-__RCSID("$NetBSD: var.c,v 1.439 2020/08/09 09:44:14 rillig Exp $");
+__RCSID("$NetBSD: var.c,v 1.440 2020/08/09 11:04:05 rillig Exp $");
 #endif
 #endif /* not lint */
 #endif
@@ -207,21 +207,29 @@
 } VarFindFlags;
 
 typedef enum {
-    VAR_IN_USE         = 0x01, /* Variable's value is currently being used
-                                * by Var_Parse or Var_Subst.
-                                * Used to avoid endless recursion */
-    VAR_FROM_ENV       = 0x02, /* Variable comes from the environment */
-    VAR_JUNK           = 0x04, /* Variable is a junk variable that
-                                * should be destroyed when done with
-                                * it. Used by Var_Parse for undefined,
-                                * modified variables */
-    VAR_KEEP           = 0x08, /* Variable is VAR_JUNK, but we found
-                                * a use for it in some modifier and
-                                * the value is therefore valid */
-    VAR_EXPORTED       = 0x10, /* Variable is exported */
-    VAR_REEXPORT       = 0x20, /* Indicate if var needs re-export.
-                                * This would be true if it contains $'s */
-    VAR_FROM_CMD       = 0x40  /* Variable came from command line */
+    /* The variable's value is currently being used by Var_Parse or Var_Subst.
+     * This marker is used to avoid endless recursion. */
+    VAR_IN_USE = 0x01,
+    /* The variable comes from the environment.
+     * These variables are not registered in any GNode, therefore they must
+     * be freed as soon as they are not used anymore. */
+    VAR_FROM_ENV = 0x02,
+    /* The variable is a junk variable that should be destroyed when done with
+     * it.  Used by Var_Parse for undefined, modified variables. */
+    VAR_JUNK = 0x04,
+    /* Variable is VAR_JUNK, but we found a use for it in some modifier and
+     * the value is therefore valid. */
+    VAR_KEEP = 0x08,
+    /* The variable is exported to the environment, to be used by child
+     * processes. */
+    VAR_EXPORTED = 0x10,
+    /* At the point where this variable was exported, it contained an
+     * unresolved reference to another variable.  Before any child process is
+     * started, it needs to be exported again, in the hope that the referenced
+     * variable can then be resolved. */
+    VAR_REEXPORT = 0x20,
+    /* The variable came from command line. */
+    VAR_FROM_CMD = 0x40
 } VarFlags;
 
 ENUM_RTTI_7(VarFlags,
@@ -3591,7 +3599,7 @@
        (void)VarFreeEnv(v, destroy);
     } else if (v->flags & VAR_JUNK) {
        /*
-        * Perform any free'ing needed and set *freePtr to NULL so the caller
+        * Perform any freeing needed and set *freePtr to NULL so the caller
         * doesn't try to free a static pointer.
         * If VAR_KEEP is also set then we want to keep str(?) as is.
         */