src/usr.bin/make/var.c - diff

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version 1.736, 2020/12/19 20:47:24

version 1.737, 2020/12/19 22:10:17

Line 531 Var_Delete(const char *name, GNode *ctxt

Var_DeleteVar(name, ctxt);

}

* Undefine a single variable from the global scope. The argument is

* expanded once.

void

Var_Undef(char *arg)

{

* The argument must consist of exactly 1 word. Accepting more than

* 1 word would have required to split the argument into several

* words, and such splitting is already done subtly different in many

* other places of make.

* Using Str_Words to split the words, followed by Var_Subst to expand

* each variable name once would make it impossible to undefine

* variables whose names contain space characters or unbalanced

* quotes or backslashes in arbitrary positions.

* Using Var_Subst on the whole argument and splitting the words

* afterwards using Str_Words would make it impossible to undefine

* variables whose names contain space characters.

char *cp = arg;

for (; !ch_isspace(*cp) && *cp != '\0'; cp++)

continue;

if (cp == arg || *cp != '\0') {

Parse_Error(PARSE_FATAL,

"The .undef directive requires exactly 1 argument");

}

*cp = '\0';

Var_Delete(arg, VAR_GLOBAL);

/* TODO: undefine all variables, not only the first */

/* TODO: use Str_Words, like everywhere else */

}

static Boolean