alloca: port to compilers that can optimize like GCC 4.6.0

[gnulib.git] / ChangeLog

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+2011-06-20  Paul Eggert  <eggert@cs.ucla.edu>
+
+       alloca: port to compilers that can optimize like GCC 4.6.0
+       * lib/alloca.c (find_stack_direction): New signature, taken from
+       Autoconf git.  This works with GCC 4.6.0.  This code should never
+       be used with GCC 4.6.0 itself, as GCC has alloca, but it might
+       be used with other compilers that optimize as well as GCC 4.6.0 does.
+       (alloca): Adjust to new signature.
+       * m4/alloca.m4 (__AC_LIBOBJ_ALLOCA) [Autoconf version < 2.69]:
+       New macro, which patches Autoconf in a similar way.
+
+       c-stack: stop worrying about stack direction
+       * lib/c-stack.c (find_stack_direction): Remove.
+       (segv_handler): Don't worry about stack direction growth, as it's
+       too much of a pain to configure this correctly, given how compilers
+       are optimizing-away our stack-growth detection code.  Instead, assume
+       that any access to just before or just after the stack is OK.
+       * m4/c-stack.m4 (AC_SYS_XSI_STACK_OVERFLOW_HEURISTIC):
+       Don't require AC_FUNC_ALLOCA; no longer needed.
+
 2011-06-20  Eric Blake  <eblake@redhat.com>
 
        test-stat: don't allocate PATH_MAX bytes