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1.1 root 1: This is Info file gcc.info, produced by Makeinfo-1.43 from the input
2: file gcc.texi.
3:
4: This file documents the use and the internals of the GNU compiler.
5:
6: Copyright (C) 1988, 1989, 1992 Free Software Foundation, Inc.
7:
8: Permission is granted to make and distribute verbatim copies of
9: this manual provided the copyright notice and this permission notice
10: are preserved on all copies.
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 section entitled "GNU General Public License" is included
15: exactly as in the original, and provided that the entire resulting
16: derived work is distributed under the terms of a permission notice
17: identical to this one.
18:
19: Permission is granted to copy and distribute translations of this
20: manual into another language, under the above conditions for modified
21: versions, except that the section entitled "GNU General Public
22: License" and this permission notice may be included in translations
23: approved by the Free Software Foundation instead of in the original
24: English.
25:
26:
27: File: gcc.info, Node: Config, Next: Index, Prev: Machine Macros, Up: Top
28:
29: The Configuration File
30: **********************
31:
32: The configuration file `xm-MACHINE.h' contains macro definitions
33: that describe the machine and system on which the compiler is running,
34: unlike the definitions in `MACHINE.h', which describe the machine for
35: which the compiler is producing output. Most of the values in
36: `xm-MACHINE.h' are actually the same on all machines that GNU CC runs
37: on, so large parts of all configuration files are identical. But
38: there are some macros that vary:
39:
40: `USG'
41: Define this macro if the host system is System V.
42:
43: `VMS'
44: Define this macro if the host system is VMS.
45:
46: `FAILURE_EXIT_CODE'
47: A C expression for the status code to be returned when the
48: compiler exits after serious errors.
49:
50: `SUCCESS_EXIT_CODE'
51: A C expression for the status code to be returned when the
52: compiler exits without serious errors.
53:
54: `HOST_WORDS_BIG_ENDIAN'
55: Defined if the host machine stores words of multi-word values in
56: big-endian order. (GNU CC does not depend on the host byte
57: ordering within a word.)
58:
59: `HOST_FLOAT_FORMAT'
60: A numeric code distinguishing the floating point format for the
61: host machine. See `TARGET_FLOAT_FORMAT' in *Note Storage
62: Layout:: for the alternatives and default.
63:
64: `HOST_BITS_PER_CHAR'
65: A C expression for the number of bits in `char' on the host
66: machine.
67:
68: `HOST_BITS_PER_SHORT'
69: A C expression for the number of bits in `short' on the host
70: machine.
71:
72: `HOST_BITS_PER_INT'
73: A C expression for the number of bits in `int' on the host
74: machine.
75:
76: `HOST_BITS_PER_LONG'
77: A C expression for the number of bits in `long' on the host
78: machine.
79:
80: `ONLY_INT_FIELDS'
81: Define this macro to indicate that the host compiler only supports
82: `int' bit fields, rather than other integral types, including
83: `enum', as do most C compilers.
84:
85: `EXECUTABLE_SUFFIX'
86: Define this macro if the host system uses a naming convention for
87: executable files that involves a common suffix (such as, in some
88: systems, `.exe') that must be mentioned explicitly when you run
89: the program.
90:
91: `OBSTACK_CHUNK_SIZE'
92: A C expression for the size of ordinary obstack chunks. If you
93: don't define this, a usually-reasonable default is used.
94:
95: `OBSTACK_CHUNK_ALLOC'
96: The function used to allocate obstack chunks. If you don't
97: define this, `xmalloc' is used.
98:
99: `OBSTACK_CHUNK_FREE'
100: The function used to free obstack chunks. If you don't define
101: this, `free' is used.
102:
103: `USE_C_ALLOCA'
104: Define this macro to indicate that the compiler is running with
105: the `alloca' implemented in C. This version of `alloca' can be
106: found in the file `alloca.c'; to use it, you must also alter the
107: `Makefile' variable `ALLOCA'. (This is done automatically for
108: the systems on which we know it is needed.)
109:
110: If you do define this macro, you should probably do it as follows:
111:
112: #ifndef __GNUC__
113: #define USE_C_ALLOCA
114: #else
115: #define alloca __builtin_alloca
116: #endif
117:
118: so that when the compiler is compiled with GNU CC it uses the more
119: efficient built-in `alloca' function.
120:
121: `FUNCTION_CONVERSION_BUG'
122: Define this macro to indicate that the host compiler does not
123: properly handle converting a function value to a
124: pointer-to-function when it is used in an expression.
125:
126: In addition, configuration files for system V define `bcopy',
127: `bzero' and `bcmp' as aliases. Some files define `alloca' as a macro
128: when compiled with GNU CC, in order to take advantage of the benefit
129: of GNU CC's built-in `alloca'.
130:
131:
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