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6.3.8.1 The Front End language Directory

A front end language directory contains the source files of that front end (but not of any runtime libraries, which should be outside the gcc directory). This includes documentation, and possibly some subsidiary programs build alongside the front end. Certain files are special and other parts of the compiler depend on their names:

config-lang.in
This file is required in all language subdirectories. See The Front End config-lang.in File, for details of its contents
Make-lang.in
This file is required in all language subdirectories. It contains targets lang.hook (where lang is the setting of language in config-lang.in) for the following values of hook, and any other Makefile rules required to build those targets (which may if necessary use other Makefiles specified in outputs in config-lang.in, although this is deprecated). Some hooks are defined by using a double-colon rule for hook, rather than by using a target of form lang.hook. These hooks are called “double-colon hooks” below. It also adds any testsuite targets that can use the standard rule in gcc/Makefile.in to the variable lang_checks.
all.build
all.cross
start.encap
rest.encap
FIXME: exactly what goes in each of these targets?
tags
Build an etags TAGS file in the language subdirectory in the source tree.
info
Build info documentation for the front end, in the build directory. This target is only called by `make bootstrap' if a suitable version of makeinfo is available, so does not need to check for this, and should fail if an error occurs.
dvi
Build DVI documentation for the front end, in the build directory. This should be done using $(TEXI2DVI), with appropriate -I arguments pointing to directories of included files. This hook is a double-colon hook.
html
Build HTML documentation for the front end, in the build directory.
man
Build generated man pages for the front end from Texinfo manuals (see Man Page Generation), in the build directory. This target is only called if the necessary tools are available, but should ignore errors so as not to stop the build if errors occur; man pages are optional and the tools involved may be installed in a broken way.
install-normal
FIXME: what is this target for?
install-common
Install everything that is part of the front end, apart from the compiler executables listed in compilers in config-lang.in.
install-info
Install info documentation for the front end, if it is present in the source directory. This target should have dependencies on info files that should be installed. This hook is a double-colon hook.
install-man
Install man pages for the front end. This target should ignore errors.
srcextra
Copies its dependencies into the source directory. This generally should be used for generated files such as Bison output files which are not present in CVS, but should be included in any release tarballs. This target will be executed during a bootstrap if `--enable-generated-files-in-srcdir' was specified as a configure option.
srcinfo
srcman
Copies its dependencies into the source directory. These targets will be executed during a bootstrap if `--enable-generated-files-in-srcdir' was specified as a configure option.
uninstall
Uninstall files installed by installing the compiler. This is currently documented not to be supported, so the hook need not do anything.
mostlyclean
clean
distclean
maintainer-clean
The language parts of the standard GNU `*clean' targets. See Standard Targets for Users, for details of the standard targets. For GCC, maintainer-clean should delete all generated files in the source directory that are not checked into CVS, but should not delete anything checked into CVS.
stage1
stage2
stage3
stage4
stageprofile
stagefeedback
Move to the stage directory files not included in stagestuff in config-lang.in or otherwise moved by the main Makefile.

lang.opt
This file registers the set of switches that the front end accepts on the command line, and their --help text. See Options.
lang-specs.h
This file provides entries for default_compilers in gcc.c which override the default of giving an error that a compiler for that language is not installed.
language-tree.def
This file, which need not exist, defines any language-specific tree codes.