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Initialize strtok_r's saveptr to NULL

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Building gdb with --enable-build-with-cxx=no trips on a warning:

 ../../binutils-gdb/gdb/rust-lang.c:173:15: error: saveptr may be used
 uninitialized in this function [-Werror=maybe-uninitialized]
     ret.name = concat (TYPE_NAME (type), "::", token, (char *) NULL);

The problem is that gcc doesn't understand that "tail" can never be
NULL in the call to strtok_r:

      name = xstrdup (TYPE_FIELD_NAME (type, 0));
      cleanup = make_cleanup (xfree, name);
      tail = name + strlen (RUST_ENUM_PREFIX);
...
      for (token = strtok_r (tail, "$", &saveptr);

Fix this by always initializing saveptr.

2016-06-29  Manish Goregaokar  <manish@mozilla.com>

gdb/ChangeLog:
    * rust-lang.c (rust_get_disr_info): Initialize saveptr to NULL.
This commit is contained in:
Manish Goregaokar 2016-06-29 17:09:43 +05:30
parent 28244707d9
commit 9bf74fb27d
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2 changed files with 6 additions and 1 deletions
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5
gdb/ChangeLog
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@ -1,5 +1,10 @@
2016-06-29 Manish Goregaokar <manish@mozilla.com>
gdb/ChangeLog:
* rust-lang.c (rust_get_disr_info): Initialize saveptr to NULL.
2016-06-29 Manish Goregaokar <manish@mozilla.com>
gdb/ChangeLog:
* rust-lang.c (rust_get_disr_info): Use strtok_r instead of strsep.

2
gdb/rust-lang.c
View File

@ -121,7 +121,7 @@ rust_get_disr_info (struct type *type, const gdb_byte *valaddr,
if (strncmp (TYPE_FIELD_NAME (type, 0), RUST_ENUM_PREFIX,
strlen (RUST_ENUM_PREFIX)) == 0)
{
char *tail, *token, *name, *saveptr;
char *tail, *token, *name, *saveptr = NULL;
unsigned long fieldno;
struct type *member_type;
LONGEST value;