BSD 4_4_Lite2 development

Work on file usr/src/contrib/gawk-2.15.2/README.rs6000

Synthesized-from: CSRG/cd3/4.4BSD-Lite2

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+Date:  Fri, 26 Apr 1991 18:01:04 -0300
+From:  mjlx@eagle.cnsf.cornell.edu (Mike Lijewski)
+To:    arnold@audiofax.com
+Cc:    david@cs.dal.ca
+Subject: testing 2.12 on a machine with unsigned chars
+
+I chose to use the alloca which you supply.  The RS/6000 has a builtin
+alloca which is accessible using a `#pragma alloca', but I chose not
+to use it.  Initially, I tried to use it by conditionally compiling it,
+similar to the way alloca.h is included on sparcs.  But this has
+some problems.  Firstly, the RS/6000 compiler complains about the
+placement of the #pragma, something to the intent that the pragma must
+precede all C code.  This would be easy enough to fix by conditionally
+including the #pragma elsewhere in the relevant files.  A more
+difficult problem is that the awk.tab.c generated by bison uses
+alloca.  To fix this the right way, bison would have to be modified to
+output the appropriate conditionally compilable code as it does now
+for sparcs.  If you think it is worth while to use the builtin alloca,
+I would be happy to get it working, except for the bison problem, and
+send you the diffs.  The FSF might also be interested in "fixing"
+bison to use the builtin alloca on the RS/6000.