207 lines
7.5 KiB
Plaintext
207 lines
7.5 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 new 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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Usually, the mkfixinc.sh script will be able to detect when
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the binary is not runable. If you do have problems, however,
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please try configuring "--without-fast-fixincludes". Thank you.
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Regards,
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Bruce <autogen@linuxbox.com>
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POSSIBLE PROBLEMS
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=================
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There may be some systems on which the fixinc binary program appears
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to be functional, but fails to work. If you are experiencing this
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problem, then copy the script ${src}/gcc/fixinc/inclhack.sh into
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${builddir}/gcc/fixinc.sh and run make again.
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And, *please* also report the problem with a description of
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the failure mode (symptoms) and the output from:
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egcs/config.guess
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to me: Bruce Korb <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: autogen@linuxbox.com.
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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 uderstand 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
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a tiny superset of C string syntax. Single quote strings
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follow shell single quote string formation rules, except
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that the backslash is processed before '\\', '\'' and '#'
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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. A C language subroutine method for both tests and fixes.
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4. Replacement text. If the replacement is empty, then
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no fix is applied. Otherwise, the replacement text is written
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to the output file and no further fixes are applied.
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Replacement text "fixes" must be first in this file!!
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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 = dec_intern_asm;
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files = c_asm.h;
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sed = "/^[ \t]*float[ \t]*fasm/i\\\n#ifdef __DECC\n";
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sed = "/^[ \t]*#[ \t]*pragma[ \t]*intrinsic([ \t]*dasm/a\\\n"
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"#endif\n";
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When this ``fix'' is invoked, sed will be run on the original
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file with two "-e" arguments. Since these arguments have double
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quoted string values, the strings actually passed to ``sed''
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will have been processed in the same fashion that the C compiler
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processes its string specifications. Including the concatenation
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of the two pieces of the second sed "-e" argument.
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------------------
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hackname = m88k_multi_incl;
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shell =
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"echo Fixing $file, to protect against multiple inclusion. >&2
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cpp_wrapper=`echo $file | sed -e 's,\\.,_,g' -e 's,/,_,g'`
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echo \"#ifndef __GCC_GOT_${cpp_wrapper}_\"
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echo \"#define __GCC_GOT_${cpp_wrapper}_\"
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cat
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echo \"#endif /* ! __GCC_GOT_${cpp_wrapper}_ */\"";
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This is a shell script fix. Note the ``cat'' without any arguments.
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This will drain stdin. If the contents of the file were to be
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discarded, you would have to have something like ``cat > /dev/null''
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in the script.
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------------------
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hackname = no_double_slash;
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c_fix = "no_double_slash";
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This specifies a fix to be supplied via a hand coded internal
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function named ``no_double_slash_fix()''. See ``fixfixes.c''
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for documentation on how to include new functions into that
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module.
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