5 See also: http://autogen.SourceForge.net/fixinc.html
7 The set of fixes required was distilled down to just the data required
8 to specify what needed to happen for each fix. Those data were edited
9 into a file named gcc/fixinc/inclhack.def. A program called AutoGen
10 (http://autogen.SourceForge.net) uses these definitions to instantiate
11 several different templates that then produces code for a fixinclude
12 program (fixincl.x) and a shell script to test its functioning. On
13 certain platforms (viz. those that do not have functional bidirectional
14 pipes), the fixincl program is split into two. This should only concern
22 GCC MAINTAINER INFORMATION
23 ==========================
25 If you are having some problem with a system header that is either
26 broken by the manufacturer, or is broken by the fixinclude process,
27 then you will need to alter or add information to the include fix
28 definitions file, ``inclhack.def''. Please also send relevant
29 information to gcc-bugs@gcc.gnu.org, gcc-patches@gcc.gnu.org and,
30 please, to me: bkorb@gnu.org.
32 To make your fix, you will need to do several things:
34 1. Obtain access to the AutoGen program on some platform. It does
35 not have to be your build platform, but it is more convenient.
37 2. Edit "inclhack.def" to reflect the changes you need to make.
38 See below for information on how to make those changes.
40 3. Run the "genfixes" shell script to produce a new copy of
43 4. Rebuild the compiler and check the header causing the issue.
44 Make sure it is now properly handled. Add tests to the
45 "test_text" entry(ies) that validate your fix. This will
46 help ensure that future fixes won't negate your work.
48 5. Go into the fixinc build directory and type, "make check".
49 You are guaranteed to have issues printed out as a result.
50 Look at the diffs produced. Make sure you have not clobbered
51 the proper functioning of a different fix. Make sure your
52 fix is properly tested and it does what it is supposed to do.
54 6. Now that you have the right things happening, syncronize the
55 $(srcdir)/tests/base directory with the $(builddir)/tests/res
56 directory. The output of "make check" will be some diffs that
57 should give you some hints about what to do.
59 7. Rerun "make check" and verify that there are no issues left.
62 MAKING CHANGES TO INCLHACK.DEF
63 ==============================
65 0. If you are not the fixincludes maintainer, please send that
66 person email about any changes you may want to make. Thanks!
68 1. Every fix must have a "hackname" that is compatible with C syntax
69 for variable names and is unique without regard to alphabetic case.
70 Please keep them alphabetical by this name. :-)
72 2. If the problem is known to exist only in certain files,
73 then name each such file with a "files = " entry.
75 3. It is relatively expensive to fire off a process to fix a source
76 file, therefore write apply tests to avoid unnecessary fix
77 processes. The preferred apply tests are "select", "bypass" and
78 "c_test" because they are performed internally. "test" sends
79 a command to a server shell that actually fires off one or more
80 processes to do the testing. Avoid it, if you can, but it is
81 still more efficient than a fix process. Also available is
82 "mach". If the target machine matches any of the named
83 globbing-style patterns, then the machine name test will pass.
84 It is desired, however, to limit the use of this test.
86 These tests are required to:
88 1. Be positive for all header files that require the fix.
92 2. Be negative as often as possible whenever the fix is not
93 required, avoiding the process overhead.
97 3. The expression is as simple as possible to both
98 process and understand by people. :-)
100 Please take advantage of the fact AutoGen will glue
101 together string fragments. It helps. Also take note
102 that double quote strings and single quote strings have
103 different formation rules. Double quote strings are a
104 tiny superset of ANSI-C string syntax. Single quote
105 strings follow shell single quote string formation
106 rules, except that the backslash is processed before
107 '\\', '\'' and '#' characters (using C character syntax).
109 Each test must pass or the fix is not applied. For example,
110 all "select" expressions must be found and not one "bypass"
111 selection may be found.
113 Examples of test specifications:
115 hackname = broken_assert_stdio;
118 bypass = "include.*stdio.h";
120 The ``broken_assert_stdio'' fix will be applied only to a file
121 named "assert.h" if it contains the string "stderr" _and_ it
122 does _not_ contain the expression "include.*stdio.h".
124 hackname = no_double_slash;
125 c_test = "double_slash";
127 The ``no_double_slash'' fix will be applied if the
128 ``double_slash_test()'' function says to. See ``fixtests.c''
129 for documentation on how to include new functions into that
132 4. There are currently four methods of fixing a file:
134 1. a series of sed expressions. Each will be an individual
135 "-e" argument to a single invocation of sed.
137 2. a shell script. These scripts are _required_ to read all
138 of stdin in order to avoid pipe stalls. They may choose to
141 3. Replacement text. If the replacement is empty, then no
142 fix is applied. Otherwise, the replacement text is
143 written to the output file and no further fixes are
144 applied. If you really want a no-op file, replace the
147 Replacement text "fixes" must be first in this file!!
149 4. A C language subroutine method for both tests and fixes.
150 See ``fixtests.c'' for instructions on writing C-language
151 applicability tests and ``fixfixes.c'' for C-language fixing.
152 These files also contain tables that describe the currently
153 implemented fixes and tests.
155 If at all possible, you should try to use one of the C language
156 fixes as it is far more efficient. There are currently five
157 such fixes, three of which are very special purpose:
159 i) char_macro_def - This function repairs the definition of an
160 ioctl macro that presumes CPP macro substitution within
161 pairs of single quote characters.
163 ii) char_macro_use - This function repairs the usage of ioctl
164 macros that no longer can wrap an argument with single quotes.
166 iii) machine_name - This function will look at "#if", "#ifdef",
167 "#ifndef" and "#elif" directive lines and replace the first
168 occurrence of a non-reserved name that is traditionally
169 pre-defined by the native compiler.
171 The next two are for general use:
173 iv) wrap - wraps the entire file with "#ifndef", "#define" and
174 "#endif" self-exclusionary text. It also, optionally, inserts
175 a prolog after the "#define" and an epilog just before the
176 "#endif". You can use this for a fix as follows:
179 c_fix_arg = "/* prolog text */";
180 c_fix_arg = "/* epilog text */";
182 If you want an epilog without a prolog, set the first "c_fix_arg"
183 to the empty string. Both or the second "c_fix_arg"s may be
184 omitted and the file will still be wrapped.
186 THERE IS A SPECIAL EXCEPTION TO THIS, HOWEVER:
188 If the regular expression '#if.*__need' is found, then it is
189 assumed that the file needs to be read and interpreted more
190 than once. However, the prolog and epilog text (if any) will
193 v) format - Replaces text selected with a regular expression with
194 a specialized formating string. The formatting works as follows:
195 The format text is copied to the output until a '%' character
196 is found. If the character after the '%' is another '%', then
197 one '%' is output and processing continues. If the following
198 character is not a digit, then the '%' and that character are
199 copied and processing continues. Finally, if the '%' *is*
200 followed by a digit, that digit is used as an index into the
201 regmatch_t array to replace the two characters with the matched
202 text. i.e.: "%0" is replaced by the full matching text, "%1"
203 is the first matching sub-expression, etc.
205 This is used as follows:
208 c_fix_arg = "#ifndef %1\n%0\n#endif";
209 c_fix_arg = "#define[ \t]+([A-Z][A-Z0-9a-z_]*).*";
211 This would wrap a traditional #define inside of a "#ifndef"/"#endif"
212 pair. The second "c_fix_arg" may be omitted *IF* there is
213 a select clause and the first one matches the text you want
214 replaced. You may delete text by supplying an empty string for
215 the format (the first "c_fix_arg").
217 Note: In general, a format c_fix may be used in place of one
218 sed expression. However, it will need to be rewritten by
221 sed = 's@^#if __GNUC__ == 2 && __GNUC_MINOR__ >= 7$'
222 '@& || __GNUC__ >= 3@';
224 may be rewritten using a format c_fix as:
227 c_fix_arg = '%0 || __GNUC__ >= 3';
228 c_fix_arg = '^#if __GNUC__ == 2 && __GNUC_MINOR__ >= 7$';
230 Multiple sed substitution expressions probably ought to remain sed
231 expressions in order to maintain clarity. Also note that if the
232 second sed expression is the same as the first select expression,
233 then you may omit the second c_fix_arg. The select expression will
234 be picked up and used in its absence.
239 hackname = AAA_ki_iface;
240 replace; /* empty replacement -> no fixing the file */
242 When this ``fix'' is invoked, it will prevent any fixes
247 hackname = AAB_svr4_no_varargs;
248 replace = "/* This file was generated by fixincludes. */\n"
249 "#ifndef _SYS_VARARGS_H\n"
250 "#define _SYS_VARARGS_H\n\n"
253 "#include <stdarg.h>\n"
255 "#include <varargs.h>\n"
258 "#endif /* _SYS_VARARGS_H */\n";
260 When this ``fix'' is invoked, the replacement text will be
261 emitted into the replacement include file. No further fixes
266 hackname = hpux11_fabsf;
268 select = "^[ \t]*#[ \t]*define[ \t]+fabsf\\(.*";
269 bypass = "__cplusplus";
272 c_fix_arg = "#ifndef __cplusplus\n%0\n#endif";
275 "# define fabsf(x) ((float)fabs((double)(float)(x)))\n";
277 This fix will ensure that the #define for fabs is wrapped
278 with C++ protection, providing the header is not already
285 The brute force method is, of course, to configure and build
286 GCC. But you can also:
288 cd ${top_builddir}/gcc
289 rm -rf fixinc.sh include/ stmp-fixinc
292 I would really recommend, however:
294 cd ${top_builddir}/gcc/fixinc
297 To do this, you *must* have autogen installed on your system.
298 The "check" step will proceed to construct a shell script that
299 will exercise all the fixes, using the sample test_text
300 provided with each fix. Once done, the changes made will
301 be compared against the changes saved in the source directory.
302 If you are changing the tests or fixes, the change will likely