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Suspicious compiler warnings

From: Eli Zaretskii
Subject: Suspicious compiler warnings
Date: Thu, 25 Apr 2013 20:13:17 +0300

FYI: when compiling git head of a few days ago, I see several
warnings.  They are mostly harmless, but these two look real,
especially the first one:

  implicit.c: In function 'pattern_search':
  implicit.c:225:15: warning: variable 'deps' set but not used 

  job.c: In function 'new_job':
  job.c:2124:12: warning: assignment discards 'const' qualifier from pointer 
target type [enabled by default]

The latter one is about this:

      char *nm;

      if (! cmds->fileinfo.filenm)
        nm = _("<builtin>");  <<<<<<<<<<<<<<<<<<<<<<<<<<<<
          nm = alloca (strlen (cmds->fileinfo.filenm) + 1 + 11 + 1);
          sprintf (nm, "%s:%lu", cmds->fileinfo.filenm, cmds->fileinfo.lineno);


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