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annotate gcc/doc/hostconfig.texi @ 67:f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
author | nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> |
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date | Tue, 22 Mar 2011 17:18:12 +0900 |
parents | 77e2b8dfacca |
children | 04ced10e8804 |
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0 | 1 @c Copyright (C) 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, |
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2 @c 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009 |
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3 @c Free Software Foundation, Inc. |
0 | 4 @c This is part of the GCC manual. |
5 @c For copying conditions, see the file gccint.texi. | |
6 | |
7 @node Host Config | |
8 @chapter Host Configuration | |
9 @cindex host configuration | |
10 | |
11 Most details about the machine and system on which the compiler is | |
12 actually running are detected by the @command{configure} script. Some | |
13 things are impossible for @command{configure} to detect; these are | |
14 described in two ways, either by macros defined in a file named | |
15 @file{xm-@var{machine}.h} or by hook functions in the file specified | |
16 by the @var{out_host_hook_obj} variable in @file{config.gcc}. (The | |
17 intention is that very few hosts will need a header file but nearly | |
18 every fully supported host will need to override some hooks.) | |
19 | |
20 If you need to define only a few macros, and they have simple | |
21 definitions, consider using the @code{xm_defines} variable in your | |
22 @file{config.gcc} entry instead of creating a host configuration | |
23 header. @xref{System Config}. | |
24 | |
25 @menu | |
26 * Host Common:: Things every host probably needs implemented. | |
27 * Filesystem:: Your host can't have the letter `a' in filenames? | |
28 * Host Misc:: Rare configuration options for hosts. | |
29 @end menu | |
30 | |
31 @node Host Common | |
32 @section Host Common | |
33 @cindex host hooks | |
34 @cindex host functions | |
35 | |
36 Some things are just not portable, even between similar operating systems, | |
37 and are too difficult for autoconf to detect. They get implemented using | |
38 hook functions in the file specified by the @var{host_hook_obj} | |
39 variable in @file{config.gcc}. | |
40 | |
41 @deftypefn {Host Hook} void HOST_HOOKS_EXTRA_SIGNALS (void) | |
42 This host hook is used to set up handling for extra signals. The most | |
43 common thing to do in this hook is to detect stack overflow. | |
44 @end deftypefn | |
45 | |
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46 @deftypefn {Host Hook} {void *} HOST_HOOKS_GT_PCH_GET_ADDRESS (size_t @ |
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47 @var{size}, int @var{fd}) |
0 | 48 This host hook returns the address of some space that is likely to be |
49 free in some subsequent invocation of the compiler. We intend to load | |
50 the PCH data at this address such that the data need not be relocated. | |
51 The area should be able to hold @var{size} bytes. If the host uses | |
52 @code{mmap}, @var{fd} is an open file descriptor that can be used for | |
53 probing. | |
54 @end deftypefn | |
55 | |
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56 @deftypefn {Host Hook} int HOST_HOOKS_GT_PCH_USE_ADDRESS (void * @var{address}, @ |
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57 size_t @var{size}, int @var{fd}, size_t @var{offset}) |
0 | 58 This host hook is called when a PCH file is about to be loaded. |
59 We want to load @var{size} bytes from @var{fd} at @var{offset} | |
60 into memory at @var{address}. The given address will be the result of | |
61 a previous invocation of @code{HOST_HOOKS_GT_PCH_GET_ADDRESS}. | |
62 Return @minus{}1 if we couldn't allocate @var{size} bytes at @var{address}. | |
63 Return 0 if the memory is allocated but the data is not loaded. Return 1 | |
64 if the hook has performed everything. | |
65 | |
66 If the implementation uses reserved address space, free any reserved | |
67 space beyond @var{size}, regardless of the return value. If no PCH will | |
68 be loaded, this hook may be called with @var{size} zero, in which case | |
69 all reserved address space should be freed. | |
70 | |
71 Do not try to handle values of @var{address} that could not have been | |
72 returned by this executable; just return @minus{}1. Such values usually | |
73 indicate an out-of-date PCH file (built by some other GCC executable), | |
74 and such a PCH file won't work. | |
75 @end deftypefn | |
76 | |
77 @deftypefn {Host Hook} size_t HOST_HOOKS_GT_PCH_ALLOC_GRANULARITY (void); | |
78 This host hook returns the alignment required for allocating virtual | |
79 memory. Usually this is the same as getpagesize, but on some hosts the | |
80 alignment for reserving memory differs from the pagesize for committing | |
81 memory. | |
82 @end deftypefn | |
83 | |
84 @node Filesystem | |
85 @section Host Filesystem | |
86 @cindex configuration file | |
87 @cindex @file{xm-@var{machine}.h} | |
88 | |
89 GCC needs to know a number of things about the semantics of the host | |
90 machine's filesystem. Filesystems with Unix and MS-DOS semantics are | |
91 automatically detected. For other systems, you can define the | |
92 following macros in @file{xm-@var{machine}.h}. | |
93 | |
94 @ftable @code | |
95 @item HAVE_DOS_BASED_FILE_SYSTEM | |
96 This macro is automatically defined by @file{system.h} if the host | |
97 file system obeys the semantics defined by MS-DOS instead of Unix. | |
98 DOS file systems are case insensitive, file specifications may begin | |
99 with a drive letter, and both forward slash and backslash (@samp{/} | |
100 and @samp{\}) are directory separators. | |
101 | |
102 @item DIR_SEPARATOR | |
103 @itemx DIR_SEPARATOR_2 | |
104 If defined, these macros expand to character constants specifying | |
105 separators for directory names within a file specification. | |
106 @file{system.h} will automatically give them appropriate values on | |
107 Unix and MS-DOS file systems. If your file system is neither of | |
108 these, define one or both appropriately in @file{xm-@var{machine}.h}. | |
109 | |
110 However, operating systems like VMS, where constructing a pathname is | |
111 more complicated than just stringing together directory names | |
112 separated by a special character, should not define either of these | |
113 macros. | |
114 | |
115 @item PATH_SEPARATOR | |
116 If defined, this macro should expand to a character constant | |
117 specifying the separator for elements of search paths. The default | |
118 value is a colon (@samp{:}). DOS-based systems usually, but not | |
119 always, use semicolon (@samp{;}). | |
120 | |
121 @item VMS | |
122 Define this macro if the host system is VMS@. | |
123 | |
124 @item HOST_OBJECT_SUFFIX | |
125 Define this macro to be a C string representing the suffix for object | |
126 files on your host machine. If you do not define this macro, GCC will | |
127 use @samp{.o} as the suffix for object files. | |
128 | |
129 @item HOST_EXECUTABLE_SUFFIX | |
130 Define this macro to be a C string representing the suffix for | |
131 executable files on your host machine. If you do not define this macro, | |
132 GCC will use the null string as the suffix for executable files. | |
133 | |
134 @item HOST_BIT_BUCKET | |
135 A pathname defined by the host operating system, which can be opened as | |
136 a file and written to, but all the information written is discarded. | |
137 This is commonly known as a @dfn{bit bucket} or @dfn{null device}. If | |
138 you do not define this macro, GCC will use @samp{/dev/null} as the bit | |
139 bucket. If the host does not support a bit bucket, define this macro to | |
140 an invalid filename. | |
141 | |
142 @item UPDATE_PATH_HOST_CANONICALIZE (@var{path}) | |
143 If defined, a C statement (sans semicolon) that performs host-dependent | |
144 canonicalization when a path used in a compilation driver or | |
145 preprocessor is canonicalized. @var{path} is a malloc-ed path to be | |
146 canonicalized. If the C statement does canonicalize @var{path} into a | |
147 different buffer, the old path should be freed and the new buffer should | |
148 have been allocated with malloc. | |
149 | |
150 @item DUMPFILE_FORMAT | |
151 Define this macro to be a C string representing the format to use for | |
152 constructing the index part of debugging dump file names. The resultant | |
153 string must fit in fifteen bytes. The full filename will be the | |
154 concatenation of: the prefix of the assembler file name, the string | |
155 resulting from applying this format to an index number, and a string | |
156 unique to each dump file kind, e.g.@: @samp{rtl}. | |
157 | |
158 If you do not define this macro, GCC will use @samp{.%02d.}. You should | |
159 define this macro if using the default will create an invalid file name. | |
160 | |
161 @item DELETE_IF_ORDINARY | |
162 Define this macro to be a C statement (sans semicolon) that performs | |
163 host-dependent removal of ordinary temp files in the compilation driver. | |
164 | |
165 If you do not define this macro, GCC will use the default version. You | |
166 should define this macro if the default version does not reliably remove | |
167 the temp file as, for example, on VMS which allows multiple versions | |
168 of a file. | |
169 | |
170 @item HOST_LACKS_INODE_NUMBERS | |
171 Define this macro if the host filesystem does not report meaningful inode | |
172 numbers in struct stat. | |
173 @end ftable | |
174 | |
175 @node Host Misc | |
176 @section Host Misc | |
177 @cindex configuration file | |
178 @cindex @file{xm-@var{machine}.h} | |
179 | |
180 @ftable @code | |
181 @item FATAL_EXIT_CODE | |
182 A C expression for the status code to be returned when the compiler | |
183 exits after serious errors. The default is the system-provided macro | |
184 @samp{EXIT_FAILURE}, or @samp{1} if the system doesn't define that | |
185 macro. Define this macro only if these defaults are incorrect. | |
186 | |
187 @item SUCCESS_EXIT_CODE | |
188 A C expression for the status code to be returned when the compiler | |
189 exits without serious errors. (Warnings are not serious errors.) The | |
190 default is the system-provided macro @samp{EXIT_SUCCESS}, or @samp{0} if | |
191 the system doesn't define that macro. Define this macro only if these | |
192 defaults are incorrect. | |
193 | |
194 @item USE_C_ALLOCA | |
195 Define this macro if GCC should use the C implementation of @code{alloca} | |
196 provided by @file{libiberty.a}. This only affects how some parts of the | |
197 compiler itself allocate memory. It does not change code generation. | |
198 | |
199 When GCC is built with a compiler other than itself, the C @code{alloca} | |
200 is always used. This is because most other implementations have serious | |
201 bugs. You should define this macro only on a system where no | |
202 stack-based @code{alloca} can possibly work. For instance, if a system | |
203 has a small limit on the size of the stack, GCC's builtin @code{alloca} | |
204 will not work reliably. | |
205 | |
206 @item COLLECT2_HOST_INITIALIZATION | |
207 If defined, a C statement (sans semicolon) that performs host-dependent | |
208 initialization when @code{collect2} is being initialized. | |
209 | |
210 @item GCC_DRIVER_HOST_INITIALIZATION | |
211 If defined, a C statement (sans semicolon) that performs host-dependent | |
212 initialization when a compilation driver is being initialized. | |
213 | |
214 @item HOST_LONG_LONG_FORMAT | |
215 If defined, the string used to indicate an argument of type @code{long | |
216 long} to functions like @code{printf}. The default value is | |
217 @code{"ll"}. | |
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219 @item HOST_LONG_FORMAT |
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220 If defined, the string used to indicate an argument of type @code{long} |
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221 to functions like @code{printf}. The default value is @code{"l"}. |
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222 |
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223 @item HOST_PTR_PRINTF |
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224 If defined, the string used to indicate an argument of type @code{void *} |
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225 to functions like @code{printf}. The default value is @code{"%p"}. |
0 | 226 @end ftable |
227 | |
228 In addition, if @command{configure} generates an incorrect definition of | |
229 any of the macros in @file{auto-host.h}, you can override that | |
230 definition in a host configuration header. If you need to do this, | |
231 first see if it is possible to fix @command{configure}. |