** Attachment added: "program exhibiting bug (compile with -ldl)"
   https://bugs.launchpad.net/bugs/998256/+attachment/3141970/+files/test.c

** Description changed:

  regcomp fails to compile the regular expression "^ " with memory error
  if malloc(0) returns NULL. That's valid malloc behavior, compare
  malloc(3).
  
  I had a little trouble debugging, but I believe the problem lies with
  posix/regex_internal.c:re_node_set_alloc being called with size == 0.
  
  I'm attaching a test program that should exhibit the bug.
+ 
+ ETA: I've tested this with libc6_2.15-0ubuntu10_amd64 under VMWare.

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https://bugs.launchpad.net/bugs/998256

Title:
  regcomp fails with custom malloc

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