[PATCH]: Clean up driver processing for IMA

[Caroline Tice <ctice at apple dot com>]

This patch cleans up the way the gcc driver passes multiple input files 
to the compiler.  In particular, it
adds a  new flag "combine".  When this flag is passed to the compiler 
driver, the driver attempts to pass
(for example) all the *.c files to the cc1 compiler together, allowing 
for IMA .  This patch also fixes the
driver so that "-save-temps" works properly with "-combine", and so 
that "-combine" can also handle
linker files and source files for multiple languages (for example if 
you pass it a combination of c and
c++ files, it will attempt to pass all the c files to cc1 at once, but 
will pass the c++ files individually to
cc1plus, then pass the appropriate options to the assembler/linker).  I 
have currently not modified the c++ or objective-c compiler specs to 
cope with multiple source files at once.

I have tested this on an Apple G4 running apple-darwin, and an i386 
running Linux.  It has bootstrapped
and I am in the middle of running the DejaGnu tests.  (I also tested 
various combinations of the
"-combine" "-save-temps" "-S" and "-c" flags on a multiple file C 
program).

Assuming it passes all the tests is this ok to commit to gcc 3.5?

-- Caroline Tice
ctice@apple.com


2004-03-22  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).
            * cp/lang-specs.h: Add initialization values for new fields 
in
            "struct compiler".
            * objc/lang-specs.h: Likewise.

Attachment: gcc5-imi3.txt
Description: Text document