246 lines
9.4 KiB
Plaintext
246 lines
9.4 KiB
Plaintext
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FIXINCLUDES OPERATION
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=====================
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See also: http://autogen.linuxbox.com/fixincludes
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The set of fixes required was distilled down to just the data required
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to specify what needed to happen for each fix. Those data were edited
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into a file named gcc/fixinc/inclhack.def. A program called
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AutoGen (http://autogen.linuxbox.com) uses these definitions to
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instantiate several different templates (gcc/fixinc/*.tpl) that then
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produces a fixincludes replacement shell script (inclhack.sh), a
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replacement binary program (fixincl.x) and a script to drive the
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binary fixincl.sh).
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If there is no special purpose script, then mkfixinc.sh will try to
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compile, link and test execute the binary version. If it cannot be
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successfully built, the shell version will be used instead. If
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mkfixinc.sh determines that your system needs machine-specific fixes
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that have not yet been applied to inclhack.def, it will install and
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use the current fixinc.* for that system instead.
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Regards,
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Bruce <autogen@linuxbox.com>
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GCC MAINTAINER INFORMATION
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==========================
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If you are having some problem with a system header that is either
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broken by the manufacturer, or is broken by the fixinclude process,
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then you will need to alter or add information to the include fix
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definitions file, ``inclhack.def''. Please also send relevant
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information to gcc-bugs@gcc.gnu.org, gcc-patches@gcc.gnu.org and,
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please, to me: bkorb@gnu.org.
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Here are the rules for making fixes in the inclhack.def file:
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1. Every fix must have a "hackname" that is compatible with C syntax
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for variable names and is unique without regard to alphabetic case.
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Please keep them alphabetical by this name. :-)
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2. If the problem is known to exist only in certain files,
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then name each such file with a "files = " entry.
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3. It is relatively expensive to fire off a process to fix a source
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file, therefore write apply tests to avoid unnecessary fix
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processes. The preferred apply tests are "select", "bypass" and
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"c_test" because they are performed internally. "test" sends
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a command to a server shell that actually fires off one or more
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processes to do the testing. Avoid it, if you can, but it is
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still more efficient than a fix process. Also available is
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"mach". If the target machine matches any of the named
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globbing-style patterns, then the machine name test will pass.
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It is desired, however, to limit the use of this test.
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These tests are required to:
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1. Be positive for all header files that require the fix.
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It is desireable to:
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2. Be negative as often as possible whenever the fix is not
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required, avoiding the process overhead.
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It is nice if:
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3. The expression is as simple as possible to both
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process and understand by people. :-)
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Please take advantage of the fact AutoGen will glue
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together string fragments. It helps. Also take note
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that double quote strings and single quote strings have
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different formation rules. Double quote strings are a
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tiny superset of ANSI-C string syntax. Single quote
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strings follow shell single quote string formation
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rules, except that the backslash is processed before
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'\\', '\'' and '#' characters (using C character syntax).
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Examples of test specifications:
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hackname = broken_assert_stdio;
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files = assert.h;
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select = stderr;
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bypass = "include.*stdio.h";
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The ``broken_assert_stdio'' fix will be applied only to a file
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named "assert.h" if it contains the string "stderr" _and_ it
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does _not_ contain the expression "include.*stdio.h".
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hackname = no_double_slash;
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c_test = "double_slash";
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The ``no_double_slash'' fix will be applied if the
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``double_slash_test()'' function says to. See ``fixtests.c''
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for documentation on how to include new functions into that
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module.
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4. There are currently four methods of fixing a file:
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1. a series of sed expressions. Each will be an individual
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"-e" argument to a single invocation of sed.
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2. a shell script. These scripts are _required_ to read all
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of stdin in order to avoid pipe stalls. They may choose to
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discard the input.
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3. Replacement text. If the replacement is empty, then no
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fix is applied. Otherwise, the replacement text is
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written to the output file and no further fixes are
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applied. If you really want a no-op file, replace the
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file with a comment.
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Replacement text "fixes" must be first in this file!!
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4. A C language subroutine method for both tests and fixes.
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See ``fixtests.c'' for instructions on writing C-language
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applicability tests and ``fixfixes.c'' for C-language fixing.
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These files also contain tables that describe the currently
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implemented fixes and tests.
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If at all possible, you should try to use one of the C language
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fixes as it is far more efficient. There are currently five
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such fixes, three of which are very special purpose:
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i) char_macro_def - This function repairs the definition of an
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ioctl macro that presumes CPP macro substitution within
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pairs of single quote characters.
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ii) char_macro_use - This function repairs the usage of ioctl
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macros that no longer can wrap an argument with single quotes.
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iii) machine_name - This function will look at "#if", "#ifdef",
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"#ifndef" and "#elif" directive lines and replace the first
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occurrence of a non-reserved name that is traditionally
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pre-defined by the native compiler.
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The next two are for general use:
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iv) wrap - wraps the entire file with "#ifndef", "#define" and
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"#endif" self-exclusionary text. It also, optionally, inserts
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a prolog after the "#define" and an epilog just before the
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"#endif". You can use this for a fix as follows:
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c_fix = wrap;
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c_fix_arg = "/* prolog text */";
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c_fix_arg = "/* epilog text */";
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If you want an epilog without a prolog, set the first "c_fix_arg"
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to the empty string. Both or the second "c_fix_arg"s may be
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omitted and the file will still be wrapped.
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v) format - Replaces text selected with a regular expression with
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a specialized formating string. The formatting works as follows:
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The format text is copied to the output until a '%' character
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is found. If the character after the '%' is another '%', then
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one '%' is output and processing continues. If the following
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character is not a digit, then the '%' and that character are
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copied and processing continues. Finally, if the '%' *is*
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followed by a digit, that digit is used as an index into the
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regmatch_t array to replace the two characters with the matched
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text. i.e.: "%0" is replaced by the full matching text, "%1"
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is the first matching sub-expression, etc.
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This is used as follows:
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c_fix = format;
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c_fix_arg = "#ifndef %1\n%0\n#endif";
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c_fix_arg = "#define[ \t]+([A-Z][A-Z0-9a-z_]*).*";
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This would wrap a traditional #define inside of a "#ifndef"/"#endif"
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pair. The second "c_fix_arg" may be omitted *IF* there is
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a select clause and the first one matches the text you want
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replaced. You may delete text by supplying an empty string for
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the format (the first "c_fix_arg").
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EXAMPLES OF FIXES:
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==================
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hackname = AAA_ki_iface;
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replace; /* empty replacement -> no fixing the file */
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When this ``fix'' is invoked, it will prevent any fixes
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from being applied.
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------------------
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hackname = AAB_svr4_no_varargs;
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replace = "/* This file was generated by fixincludes. */\n"
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"#ifndef _SYS_VARARGS_H\n"
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"#define _SYS_VARARGS_H\n\n"
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"#ifdef __STDC__\n"
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"#include <stdarg.h>\n"
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"#else\n"
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"#include <varargs.h>\n"
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"#endif\n\n"
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"#endif /* _SYS_VARARGS_H */\n";
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When this ``fix'' is invoked, the replacement text will be
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emitted into the replacement include file. No further fixes
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will be applied.
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------------------
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hackname = hpux11_fabsf;
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files = math.h;
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select = "^[ \t]*#[ \t]*define[ \t]+fabsf\\(.*";
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bypass = "__cplusplus";
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c_fix = format;
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c_fix_arg = "#ifndef __cplusplus\n%0\n#endif";
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test_text =
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"# define fabsf(x) ((float)fabs((double)(float)(x)))\n";
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This fix will ensure that the #define for fabs is wrapped
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with C++ protection, providing the header is not already
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C++ aware.
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------------------
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5. Testing fixes.
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The brute force method is, of course, to configure and build
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GCC. But you can also:
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cd ${top_builddir}/gcc
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rm -rf fixinc.sh include/ stmp-fixinc
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make stmp-fixinc
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I would really recommend, however:
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cd ${top_builddir}/gcc/fixinc
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make check
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To do this, you *must* have autogen installed on your system.
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The "check" step will proceed to construct a shell script that
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will exercize all the fixes, using the sample test_text
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provided with each fix. Once done, the changes made will
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be compared against the changes saved in the source directory.
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If you are changing the tests or fixes, the change will likely
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be highlighted.
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