Patch to add ATTRIBUTE_MALLOC to libiberty C_alloca

[Kaveh R. Ghazi]

This patch adds ATTRIBUTE_MALLOC to C_alloca in libiberty.  This would
be useful if one uses gcc and defines USE_C_ALLOCA when compiling code
using libiberty, (e.g. on a platform where stack space is restricted.)

I tested the patch by adding USE_C_ALLOCA to BOOT_CFLAGS on
sparc-sun-solaris2.7 and bootstrapping (minus java, because of some
unrelated libffi failures.)  There were no testsuite regressions.

Incidently, it also verifies that using C_alloca in stage2,3 has no
inherent problems either. :-)

Ok to install?

		Thanks,
		--Kaveh

PS: I wonder whether __builtin_alloca marks itself so that the
appropriate ATTRIBUTE_MALLOC aliasing info also gets propagated.
Anyone know?


2002-01-25  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>

	* libiberty.h (C_alloca): Add ATTRIBUTE_MALLOC.

diff -rup orig/egcc-CVS20020120/include/libiberty.h egcc-CVS20020120/include/libiberty.h
--- orig/egcc-CVS20020120/include/libiberty.h	Mon Oct 22 23:13:10 2001
+++ egcc-CVS20020120/include/libiberty.h	Mon Jan 21 10:33:36 2002
@@ -283,7 +283,7 @@ extern int vasprintf PARAMS ((char **, c
    USE_C_ALLOCA yourself.  The canonical autoconf macro C_ALLOCA is
    also set/unset as it is often used to indicate whether code needs
    to call alloca(0).  */
-extern PTR C_alloca PARAMS((size_t));
+extern PTR C_alloca PARAMS ((size_t)) ATTRIBUTE_MALLOC;
 #undef alloca
 #if GCC_VERSION >= 2000 && !defined USE_C_ALLOCA
 # define alloca(x) __builtin_alloca(x)