+useful for system definition and development.
+
+@section Controlling file compilation
+
+When declaring a component (system, module, file),
+you can specify a keyword argument @code{:around-compile function}.
+If left unspecified,
+the value will be inherited from the parent component if any,
+or with a default of @code{nil}
+if no value is specified in any transitive parent.
+
+The argument must be a either @code{nil}, a fbound symbol,
+a lambda-expression (e.g. @code{(lambda (thunk) ...(funcall thunk ...) ...)})
+a function object (e.g. using @code{#.#'} but that's discouraged
+because it prevents the introspection done by e.g. asdf-dependency-grovel),
+or a string that when read yields a symbol or a lambda-expression.
+@code{nil} means the normal compile-file function will be called.
+A non-nil value designates a function of one argument
+that will be called with a function that
+calls the @code{*compile-op-compile-file-function*} (usually @code{compile-file*})
+with proper arguments;
+the around-compile hook may supply additional arguments
+to pass to that @code{*compile-op-compile-file-function*}.
+One notable argument that is heeded by @code{compile-file*} is
+@code{:compile-check}, a function called when the compilation was otherwise a success,
+with the same arguments as @code{compile-file},
+to determine whether
+(NB: The ability to pass such extra flags is only available starting with asdf 2.22.1.)
+
+Note that by using a string, you may reference
+a function, symbol and/or package
+that will only be created later during the build, but
+isn't yet present at the time the defsystem form is evaluated.
+However, if your entire system is using such a hook, you may have to
+explicitly override the hook with @code{nil} for all the modules and files
+that are compiled before the hook is defined.
+
+Using this hook, you may achieve such effects as:
+locally renaming packages,
+binding @var{*readtables*} and other syntax-controlling variables,
+handling warnings and other conditions,
+proclaiming consistent optimization settings,
+saving code coverage information,
+maintaining meta-data about compilation timings,
+setting gensym counters and PRNG seeds and other sources of non-determinism,
+overriding the source-location and/or timestamping systems,
+checking that some compile-time side-effects were properly balanced,
+etc.
+
+Note that there is no around-load hook. This is on purpose.
+Some implementations such as ECL, GCL or MKCL link object files,
+which allows for no such hook.
+Other implementations allow for concatenating FASL files,
+which doesn't allow for such a hook either.
+We aim to discourage something that's not portable,
+and has some dubious impact on performance and semantics
+even when it is possible.
+Things you might want to do with an around-load hook
+are better done around-compile,
+though it may at times require some creativity
+(see e.g. the @code{package-renaming} system).
+
+
+@section Controlling source file character encoding
+
+Starting with ASDF 2.21, components accept a @code{:encoding} option
+so authors may specify which character encoding should be used
+to read and evaluate their source code.
+When left unspecified, the encoding is inherited
+from the parent module or system;
+if no encoding is specified at any point,
+the default @code{:autodetect} is assumed.
+By default, only @code{:default}, @code{:utf-8}
+and @code{:autodetect} are accepted.
+@code{:autodetect}, the default, calls
+@code{*encoding-detection-hook*} which by default always returns
+@code{*default-encoding*} which itself defaults to @code{:default}.
+
+In other words, there now are plenty of extension hooks, but
+by default ASDF follows the backwards compatible behavior
+of using whichever @code{:default} encoding your implementation uses,
+which itself may or may not vary based on environment variables
+and other locale settings.
+In practice this means that only source code that only uses ASCII
+is guaranteed to be read the same on all implementations
+independently from any user setting.
+
+Additionally, for backward-compatibility with older versions of ASDF
+and/or with implementations that do not support unicode and its many encodings,
+you may want to use
+the reader conditionals @code{#+asdf-unicode #+asdf-unicode}
+to protect any @code{:encoding @emph{encoding}} statement
+as @code{:asdf-unicode} will be present in @code{*features*}
+only if you're using a recent ASDF
+on an implementation that supports unicode.
+We recommend that you avoid using unprotected @code{:encoding} specifications
+until after ASDF 2.21 or later becomes widespread, hopefully by the end of 2012.
+
+While it offers plenty of hooks for extension,
+and one such extension is being developed (see below),
+ASDF itself only recognizes one encoding beside @code{:default},
+and that is @code{:utf-8}, which is the @emph{de facto} standard,
+already used by the vast majority of libraries that use more than ASCII.
+On implementations that do not support unicode,
+the feature @code{:asdf-unicode} is absent, and
+the @code{:default} external-format is used
+to read even source files declared as @code{:utf-8}.
+On these implementations, non-ASCII characters
+intended to be read as one CL character
+may thus end up being read as multiple CL characters.
+In most cases, this shouldn't affect the software's semantics:
+comments will be skipped just the same, strings with be read and printed
+with slightly different lengths, symbol names will be accordingly longer,
+but none of it should matter.
+But a few systems that actually depend on unicode characters
+may fail to work properly, or may work in a subtly different way.
+See for instance @code{lambda-reader}.
+
+We invite you to embrace UTF-8
+as the encoding for non-ASCII characters starting today,
+even without any explicit specification in your @code{.asd} files.
+Indeed, on some implementations and configurations,
+UTF-8 is already the @code{:default},
+and loading your code may cause errors if it is encoded in anything but UTF-8.
+Therefore, even with the legacy behavior,
+non-UTF-8 is guaranteed to break for some users,
+whereas UTF-8 is pretty much guaranteed not to break anywhere
+(provided you do @emph{not} use a BOM),
+although it might be read incorrectly on some implementations.
+In the future, we intend to make @code{:utf-8}
+the default value of @code{*default-encoding*},
+to be enforced everywhere, so at least the code is guaranteed
+to be read correctly everywhere it can be.
+
+If you need non-standard character encodings for your source code,
+use the extension system @code{asdf-encodings}, by specifying
+@code{:defsystem-depends-on (:asdf-encodings)} in your @code{defsystem}.
+This extension system will register support for more encodings using the
+@code{*encoding-external-format-hook*} facility,
+so you can explicitly specify @code{:encoding :latin1}
+in your @code{.asd} file.
+Using the @code{*encoding-detection-hook*} it will also
+eventually implement some autodetection of a file's encoding
+from an emacs-style @code{-*- mode: lisp ; coding: latin1 -*-} declaration,
+or otherwise based on an analysis of octet patterns in the file.
+At this point, asdf-encoding only supports the encodings
+that are supported as part of your implementation.
+Since the list varies depending on implementations,
+we once again recommend you use @code{:utf-8} everywhere,
+which is the most portable (next is @code{:latin1}).
+
+If you're not using a version of Quicklisp that has it,
+you may get the source for @code{asdf-encodings} using git:
+@kbd{git clone git://common-lisp.net/projects/asdf/asdf-encodings.git}
+or
+@kbd{git clone ssh://common-lisp.net/project/asdf/git/asdf-encodings.git}.
+You can also browse the repository on
+@url{http://common-lisp.net/gitweb?p=projects/asdf/asdf-encodings.git}.
+
+In the future, we intend to change the default @code{*default-encoding*}
+to @code{:utf-8}, which is already the de facto standard
+for most libraries that use non-ASCII characters:
+utf-8 works everywhere and was backhandedly enforced by
+a lot of people using SBCL and utf-8 and sending reports to authors
+so they make their packages compatible.
+A survey showed only about a handful few libraries
+are incompatible with non-UTF-8, and then, only in comments,
+and we believe that authors will adopt UTF-8 when prompted.
+See the April 2012 discussion on the asdf-devel mailing-list.
+For backwards compatibility with users who insist on a non-UTF-8 encoding,
+but cannot immediately transition to using @code{asdf-encodings}
+(maybe because it isn't ready), it will still be possible to use
+the @code{:encoding :default} option in your @code{defsystem} form
+to restore the behavior of ASDF 2.20 and earlier.
+This shouldn't be required in libraries,
+because user pressure as mentioned above will already have pushed
+library authors towards using UTF-8;
+but authors of end-user programs might care.
+
+When you use @code{asdf-encodings}, any further loaded @code{.asd} file
+will use the autodetection algorithm to determine its encoding;
+yet if you depend on this detection happening,
+you may want to explicitly load @code{asdf-encodings} early in your build,
+for by the time you can use @code{:defsystem-depends-on},
+it is already too late to load it.
+In practice, this means that the @code{*default-encoding*}
+is usually used for @code{.asd} files.
+Currently, this defaults to @code{:default} for backwards compatibility,
+and that means that you shouldn't rely on non-ASCII characters in a .asd file.
+Since component (path)names are the only real data in these files,
+and non-ASCII characters are not very portable for file names,
+this isn't too much of an issue.
+We still encourage you to use either plain ASCII or UTF-8
+in @code{.asd} files,
+as we intend to make @code{:utf-8} the default encoding in the future.
+This might matter, for instance, in meta-data about author's names.
+
+
+@section Miscellaneous Exported Functions
projects / sbcl.git / blobdiff