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fix from upstream cvs
----------------------------
revision 1.58
date: 2011-08-29 12:20:19 -0400; author: psmith; state: Exp; lines: +7 -13; commitid: MdH0jSxpuIy7mqxv;
Save strings we're expanding in case an embedded eval causes them
to be freed (if they're the value of a variable that's reset for example).
See Savannah patch #7534
Index: expand.c
===================================================================
RCS file: /sources/make/make/expand.c,v
retrieving revision 1.57
retrieving revision 1.58
diff -u -p -r1.57 -r1.58
--- expand.c 7 May 2011 20:03:49 -0000 1.57
+++ expand.c 29 Aug 2011 16:20:19 -0000 1.58
@@ -197,7 +197,7 @@ variable_expand_string (char *line, cons
{
struct variable *v;
const char *p, *p1;
- char *abuf = NULL;
+ char *save;
char *o;
unsigned int line_offset;
@@ -212,16 +212,11 @@ variable_expand_string (char *line, cons
return (variable_buffer);
}
- /* If we want a subset of the string, allocate a temporary buffer for it.
- Most of the functions we use here don't work with length limits. */
- if (length > 0 && string[length] != '\0')
- {
- abuf = xmalloc(length+1);
- memcpy(abuf, string, length);
- abuf[length] = '\0';
- string = abuf;
- }
- p = string;
+ /* We need a copy of STRING: due to eval, it's possible that it will get
+ freed as we process it (it might be the value of a variable that's reset
+ for example). Also having a nil-terminated string is handy. */
+ save = length < 0 ? xstrdup (string) : xstrndup (string, length);
+ p = save;
while (1)
{
@@ -411,8 +406,7 @@ variable_expand_string (char *line, cons
++p;
}
- if (abuf)
- free (abuf);
+ free (save);
variable_buffer_output (o, "", 1);
return (variable_buffer + line_offset);
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