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Annotation of gcc/gcc.info-11, revision 1.1.1.2

1.1.1.2 ! root        1: This is Info file gcc.info, produced by Makeinfo-1.47 from the input
1.1       root        2: file gcc.texinfo.
                      3: 
                      4:    This file documents the use and the internals of the GNU compiler.
                      5: 
                      6:    Copyright (C) 1988, 1989, 1990 Free Software Foundation, Inc.
                      7: 
1.1.1.2 ! root        8:    Permission is granted to make and distribute verbatim copies of this
        !             9: manual provided the copyright notice and this permission notice are
        !            10: preserved on all copies.
1.1       root       11: 
                     12:    Permission is granted to copy and distribute modified versions of
                     13: this manual under the conditions for verbatim copying, provided also
                     14: that the sections entitled "GNU General Public License" and "Protect
                     15: Your Freedom--Fight `Look And Feel'" are included exactly as in the
                     16: original, and provided that the entire resulting derived work is
                     17: distributed under the terms of a permission notice identical to this
                     18: one.
                     19: 
                     20:    Permission is granted to copy and distribute translations of this
                     21: manual into another language, under the above conditions for modified
                     22: versions, except that the sections entitled "GNU General Public
                     23: License" and "Protect Your Freedom--Fight `Look And Feel'" and this
1.1.1.2 ! root       24: permission notice may be included in translations approved by the Free
        !            25: Software Foundation instead of in the original English.
1.1       root       26: 
                     27: 
                     28: File: gcc.info,  Node: Config,  Prev: Machine Macros,  Up: Top
                     29: 
                     30: The Configuration File
                     31: **********************
                     32: 
                     33:    The configuration file `xm-MACHINE.h' contains macro definitions
                     34: that describe the machine and system on which the compiler is running.
1.1.1.2 ! root       35: Most of the values in it are actually the same on all machines that GNU
        !            36: CC runs on, so large parts of all configuration files are identical. 
        !            37: But there are some macros that vary:
1.1       root       38: 
                     39: `FAILURE_EXIT_CODE'
1.1.1.2 ! root       40:      A C expression for the status code to be returned when the compiler
        !            41:      exits after serious errors.
1.1       root       42: 
                     43: `SUCCESS_EXIT_CODE'
1.1.1.2 ! root       44:      A C expression for the status code to be returned when the compiler
        !            45:      exits without serious errors.
1.1       root       46: 
                     47: `USE_C_ALLOCA'
1.1.1.2 ! root       48:      Define this macro to indicate that the compiler is running with the
        !            49:      `alloca' implemented in C.  This version of `alloca' can be found
        !            50:      in the file `alloca.c'; to use it, you must also alter the
1.1       root       51:      `Makefile' variable `ALLOCA'.
                     52: 
1.1.1.2 ! root       53:      This macro, unlike most, describes the machine that the compiler is
        !            54:      running on, rather than the one the compiler is compiling for.
        !            55:      Therefore, it should be set in the `xm-MACHINE.h' file rather than
        !            56:      in the `tm-MACHINE.h' file.
1.1       root       57: 
                     58:      If you do define this macro, you should probably do it as follows:
                     59: 
                     60:           #ifndef __GNUC__
                     61:           #define USE_C_ALLOCA
                     62:           #else
                     63:           #define alloca __builtin_alloca
                     64:           #endif
                     65: 
1.1.1.2 ! root       66:      so that when the compiler is compiled with GNU CC it uses the more
        !            67:      efficient built-in `alloca' function.
1.1       root       68: 
                     69:    In addition, configuration files for system V define `bcopy',
                     70: `bzero' and `bcmp' as aliases.  Some files define `alloca' as a macro
1.1.1.2 ! root       71: when compiled with GNU CC, in order to take advantage of the benefit of
        !            72: GNU CC's built-in `alloca'.
1.1       root       73: 
                     74: 

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