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+Info file gcc.info, produced by Makeinfo, -*- Text -*- from input
+file gcc.texinfo.
+
+   This file documents the use and the internals of the GNU compiler.
+
+   Copyright (C) 1988, 1989, 1990 Free Software Foundation, Inc.
+
+   Permission is granted to make and distribute verbatim copies of
+this manual provided the copyright notice and this permission notice
+are preserved on all copies.
+
+   Permission is granted to copy and distribute modified versions of
+this manual under the conditions for verbatim copying, provided also
+that the sections entitled "GNU General Public License" and "Protect
+Your Freedom--Fight `Look And Feel'" are included exactly as in the
+original, and provided that the entire resulting derived work is
+distributed under the terms of a permission notice identical to this
+one.
+
+   Permission is granted to copy and distribute translations of this
+manual into another language, under the above conditions for modified
+versions, except that the sections entitled "GNU General Public
+License" and "Protect Your Freedom--Fight `Look And Feel'" and this
+permission notice may be included in translations approved by the
+Free Software Foundation instead of in the original English.
+
+
+File: gcc.info,  Node: Config,  Prev: Machine Macros,  Up: Top
+
+The Configuration File
+**********************
+
+   The configuration file `xm-MACHINE.h' contains macro definitions
+that describe the machine and system on which the compiler is running.
+Most of the values in it are actually the same on all machines that
+GNU CC runs on, so large parts of all configuration files are
+identical.  But there are some macros that vary:
+
+`FAILURE_EXIT_CODE'
+     A C expression for the status code to be returned when the
+     compiler exits after serious errors.
+
+`SUCCESS_EXIT_CODE'
+     A C expression for the status code to be returned when the
+     compiler exits without serious errors.
+
+`USE_C_ALLOCA'
+     Define this macro to indicate that the compiler is running with
+     the `alloca' implemented in C.  This version of `alloca' can be
+     found in the file `alloca.c'; to use it, you must also alter the
+     `Makefile' variable `ALLOCA'.
+
+     This macro, unlike most, describes the machine that the compiler
+     is running on, rather than the one the compiler is compiling for.
+     Therefore, it should be set in the `xm-MACHINE.h' file rather
+     than in the `tm-MACHINE.h' file.
+
+     If you do define this macro, you should probably do it as follows:
+
+          #ifndef __GNUC__
+          #define USE_C_ALLOCA
+          #else
+          #define alloca __builtin_alloca
+          #endif
+
+     so that when the compiler is compiled with GNU CC it uses the
+     more efficient built-in `alloca' function.
+
+   In addition, configuration files for system V define `bcopy',
+`bzero' and `bcmp' as aliases.  Some files define `alloca' as a macro
+when compiled with GNU CC, in order to take advantage of the benefit
+of GNU CC's built-in `alloca'.
+
+