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0855eab7a3
2004-04-05 Caroline Tice <ctice@apple.com>
* gcc.c (combine_flag): New global variable, for new driver option.
(struct compiler): Add two new fields, to be used when
combining multiple input files in a single pass (IMA).
(default_compilers): Add values for the new fields to all
compiler entries. Modify the "@c" compiler entry for doing IMA
properly with "-save-temps" and the "combine" flag.
(option_map): Add new driver option, "--combine", to tell driver
to pass multiple input files to compiler at one time.
(have_o_argbuf_index): New global variable.
(store_arg): Modify to assign value to have_o_argbuf_index.
(struct infile): Add three new fields, to help with IMA.
(display_help): Add help for new "combine" option.
(process_command): Remove local variable have_o; add code to check
for new "combine" option; remove assignment to combine_inputs.
(do_spec_1): Modify to deal with IMA better.
(main): Make variable 'lang_n_infiles' local to entire function
rather than to a single block. Use flag combine_flag to
determine whether to do IMA or not; Modify loop initializing
infiles to deal properly with linker files.
Add code for doing preprocessing in presence of
IMA with "-save-temps" flag. Modify "main" loop to handle
multiple input files, in multiple languages, with or without
preprocessing, gracefully.
* toplev.c (set_src_pwd): Modify to not complain if attempting to
re-set it to same directory it's previously been set to (avoid
irritating, meaningless warning messages when doing IMA with
save-temps).
* doc/invoke.texi: Add "-combine" to list of Overall Options;
remove documentation about IMA that is no longer accurate; Add
documentation explaining what "-combine" does.
* ada/lang-specs.h: Add initialization values for new fields in
"struct compiler".
* cp/lang-specs.h: Likewise.
* f/lang-specs.h: Likewise.
* java/lang-specs.h: Likewise.
* objc/lang-specs.h: Likewise.
* treelang/lang-specs.h: Likewise.
Fix gcc driver to work properly with IMI.
From-SVN: r80435
GNU Objective C notes ********************* This document is to explain what has been done, and a little about how specific features differ from other implementations. The runtime has been completely rewritten in gcc 2.4. The earlier runtime had several severe bugs and was rather incomplete. The compiler has had several new features added as well. This is not documentation for Objective C, it is usable to someone who knows Objective C from somewhere else. Runtime API functions ===================== The runtime is modeled after the NeXT Objective C runtime. That is, most functions have semantics as it is known from the NeXT. The names, however, have changed. All runtime API functions have names of lowercase letters and underscores as opposed to the `traditional' mixed case names. The runtime api functions are not documented as of now. Someone offered to write it, and did it, but we were not allowed to use it by his university (Very sad story). We have started writing the documentation over again. This will be announced in appropriate places when it becomes available. Protocols ========= Protocols are now fully supported. The semantics is exactly as on the NeXT. There is a flag to specify how protocols should be typechecked when adopted to classes. The normal typechecker requires that all methods in a given protocol must be implemented in the class that adopts it -- it is not enough to inherit them. The flag `-Wno-protocol' causes it to allow inherited methods, while `-Wprotocols' is the default which requires them defined. +initialize =========== This method, if defined, is called before any other instance or class methods of that particular class. This method is not inherited, and is thus not called as initializer for a subclass that doesn't define it itself. Thus, each +initialize method is called exactly once (or never if no methods of that particular class is never called). Besides this, it is allowed to have several +initialize methods, one for each category. The order in which these (multiple methods) are called is not well defined. I am not completely certain what the semantics of this method is for other implementations, but this is how it works for GNU Objective C. Passivation/Activation/Typedstreams =================================== This is supported in the style of NeXT TypedStream's. Consult the headerfile Typedstreams.h for api functions. I (Kresten) have rewritten it in Objective C, but this implementation is not part of 2.4, it is available from the GNU Objective C prerelease archive. There is one difference worth noting concerning objects stored with objc_write_object_reference (aka NXWriteObjectReference). When these are read back in, their object is not guaranteed to be available until the `-awake' method is called in the object that requests that object. To objc_read_object you must pass a pointer to an id, which is valid after exit from the function calling it (like e.g. an instance variable). In general, you should not use objects read in until the -awake method is called. Acknowledgements ================ The GNU Objective C team: Geoffrey Knauth <gsk@marble.com> (manager), Tom Wood <wood@next.com> (compiler) and Kresten Krab Thorup <krab@iesd.auc.dk> (runtime) would like to thank a some people for participating in the development of the present GNU Objective C. Paul Burchard <burchard@geom.umn.edu> and Andrew McCallum <mccallum@cs.rochester.edu> has been very helpful debugging the runtime. Eric Herring <herring@iesd.auc.dk> has been very helpful cleaning up after the documentation-copyright disaster and is now helping with the new documentation. Steve Naroff <snaroff@next.com> and Richard Stallman <rms@gnu.ai.mit.edu> has been very helpful with implementation details in the compiler. Bug Reports =========== Please read the section `Submitting Bugreports' of the gcc manual before you submit any bugs.