On Thu, 30 Jan 2020 at 19:10, Richard Biener <[email protected]> wrote:
>
> On Thu, Jan 30, 2020 at 5:31 AM Prathamesh Kulkarni
> <[email protected]> wrote:
> >
> > On Tue, 28 Jan 2020 at 17:17, Richard Biener <[email protected]>
> > wrote:
> > >
> > > On Fri, Jan 24, 2020 at 7:04 AM Prathamesh Kulkarni
> > > <[email protected]> wrote:
> > > >
> > > > On Mon, 20 Jan 2020 at 15:44, Richard Biener
> > > > <[email protected]> wrote:
> > > > >
> > > > > On Wed, Jan 8, 2020 at 11:20 AM Prathamesh Kulkarni
> > > > > <[email protected]> wrote:
> > > > > >
> > > > > > On Tue, 5 Nov 2019 at 17:38, Richard Biener
> > > > > > <[email protected]> wrote:
> > > > > > >
> > > > > > > On Tue, Nov 5, 2019 at 12:17 AM Kugan Vivekanandarajah
> > > > > > > <[email protected]> wrote:
> > > > > > > >
> > > > > > > > Hi,
> > > > > > > > Thanks for the review.
> > > > > > > >
> > > > > > > > On Tue, 5 Nov 2019 at 03:57, H.J. Lu <[email protected]>
> > > > > > > > wrote:
> > > > > > > > >
> > > > > > > > > On Sun, Nov 3, 2019 at 6:45 PM Kugan Vivekanandarajah
> > > > > > > > > <[email protected]> wrote:
> > > > > > > > > >
> > > > > > > > > > Thanks for the reviews.
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > > On Sat, 2 Nov 2019 at 02:49, H.J. Lu <[email protected]>
> > > > > > > > > > wrote:
> > > > > > > > > > >
> > > > > > > > > > > On Thu, Oct 31, 2019 at 6:33 PM Kugan Vivekanandarajah
> > > > > > > > > > > <[email protected]> wrote:
> > > > > > > > > > > >
> > > > > > > > > > > > On Wed, 30 Oct 2019 at 03:11, H.J. Lu
> > > > > > > > > > > > <[email protected]> wrote:
> > > > > > > > > > > > >
> > > > > > > > > > > > > On Sun, Oct 27, 2019 at 6:33 PM Kugan Vivekanandarajah
> > > > > > > > > > > > > <[email protected]> wrote:
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > Hi Richard,
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > Thanks for the review.
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > On Wed, 23 Oct 2019 at 23:07, Richard Biener
> > > > > > > > > > > > > > <[email protected]> wrote:
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > On Mon, Oct 21, 2019 at 10:04 AM Kugan
> > > > > > > > > > > > > > > Vivekanandarajah
> > > > > > > > > > > > > > > <[email protected]> wrote:
> > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > Hi Richard,
> > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > Thanks for the pointers.
> > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > On Fri, 11 Oct 2019 at 22:33, Richard Biener
> > > > > > > > > > > > > > > > <[email protected]> wrote:
> > > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > > On Fri, Oct 11, 2019 at 6:15 AM Kugan
> > > > > > > > > > > > > > > > > Vivekanandarajah
> > > > > > > > > > > > > > > > > <[email protected]> wrote:
> > > > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > > > Hi Richard,
> > > > > > > > > > > > > > > > > > Thanks for the review.
> > > > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > > > On Wed, 2 Oct 2019 at 20:41, Richard Biener
> > > > > > > > > > > > > > > > > > <[email protected]> wrote:
> > > > > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > > > > On Wed, Oct 2, 2019 at 10:39 AM Kugan
> > > > > > > > > > > > > > > > > > > Vivekanandarajah
> > > > > > > > > > > > > > > > > > > <[email protected]> wrote:
> > > > > > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > > > > > Hi,
> > > > > > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > > > > > As mentioned in the PR, attached patch
> > > > > > > > > > > > > > > > > > > > adds COLLECT_AS_OPTIONS for
> > > > > > > > > > > > > > > > > > > > passing assembler options specified
> > > > > > > > > > > > > > > > > > > > with -Wa, to the link-time driver.
> > > > > > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > > > > > The proposed solution only works for
> > > > > > > > > > > > > > > > > > > > uniform -Wa options across all
> > > > > > > > > > > > > > > > > > > > TUs. As mentioned by Richard Biener,
> > > > > > > > > > > > > > > > > > > > supporting non-uniform -Wa flags
> > > > > > > > > > > > > > > > > > > > would require either adjusting
> > > > > > > > > > > > > > > > > > > > partitioning according to flags or
> > > > > > > > > > > > > > > > > > > > emitting multiple object files from a
> > > > > > > > > > > > > > > > > > > > single LTRANS CU. We could
> > > > > > > > > > > > > > > > > > > > consider this as a follow up.
> > > > > > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > > > > > Bootstrapped and regression tests on
> > > > > > > > > > > > > > > > > > > > arm-linux-gcc. Is this OK for trunk?
> > > > > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > > > > While it works for your simple cases it
> > > > > > > > > > > > > > > > > > > is unlikely to work in practice since
> > > > > > > > > > > > > > > > > > > your implementation needs the assembler
> > > > > > > > > > > > > > > > > > > options be present at the link
> > > > > > > > > > > > > > > > > > > command line. I agree that this might be
> > > > > > > > > > > > > > > > > > > the way for people to go when
> > > > > > > > > > > > > > > > > > > they face the issue but then it needs to
> > > > > > > > > > > > > > > > > > > be documented somewhere
> > > > > > > > > > > > > > > > > > > in the manual.
> > > > > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > > > > That is, with COLLECT_AS_OPTION (why
> > > > > > > > > > > > > > > > > > > singular? I'd expected
> > > > > > > > > > > > > > > > > > > COLLECT_AS_OPTIONS) available to cc1 we
> > > > > > > > > > > > > > > > > > > could stream this string
> > > > > > > > > > > > > > > > > > > to lto_options and re-materialize it at
> > > > > > > > > > > > > > > > > > > link time (and diagnose mismatches
> > > > > > > > > > > > > > > > > > > even if we like).
> > > > > > > > > > > > > > > > > > OK. I will try to implement this. So the
> > > > > > > > > > > > > > > > > > idea is if we provide
> > > > > > > > > > > > > > > > > > -Wa,options as part of the lto compile,
> > > > > > > > > > > > > > > > > > this should be available
> > > > > > > > > > > > > > > > > > during link time. Like in:
> > > > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > > > arm-linux-gnueabihf-gcc -march=armv7-a
> > > > > > > > > > > > > > > > > > -mthumb -O2 -flto
> > > > > > > > > > > > > > > > > > -Wa,-mimplicit-it=always,-mthumb -c test.c
> > > > > > > > > > > > > > > > > > arm-linux-gnueabihf-gcc -flto test.o
> > > > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > > > I am not sure where should we stream this.
> > > > > > > > > > > > > > > > > > Currently, cl_optimization
> > > > > > > > > > > > > > > > > > has all the optimization flag provided for
> > > > > > > > > > > > > > > > > > compiler and it is
> > > > > > > > > > > > > > > > > > autogenerated and all the flags are integer
> > > > > > > > > > > > > > > > > > values. Do you have any
> > > > > > > > > > > > > > > > > > preference or example where this should be
> > > > > > > > > > > > > > > > > > done.
> > > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > > In lto_write_options, I'd simply append the
> > > > > > > > > > > > > > > > > contents of COLLECT_AS_OPTIONS
> > > > > > > > > > > > > > > > > (with -Wa, prepended to each of them), then
> > > > > > > > > > > > > > > > > recover them in lto-wrapper
> > > > > > > > > > > > > > > > > for each TU and pass them down to the LTRANS
> > > > > > > > > > > > > > > > > compiles (if they agree
> > > > > > > > > > > > > > > > > for all TUs, otherwise I'd warn and drop
> > > > > > > > > > > > > > > > > them).
> > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > Attached patch streams it and also make sure
> > > > > > > > > > > > > > > > that the options are the
> > > > > > > > > > > > > > > > same for all the TUs. Maybe it is a bit
> > > > > > > > > > > > > > > > restrictive.
> > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > What is the best place to document
> > > > > > > > > > > > > > > > COLLECT_AS_OPTIONS. We don't seem
> > > > > > > > > > > > > > > > to document COLLECT_GCC_OPTIONS anywhere ?
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > Nowhere, it's an implementation detail then.
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > Attached patch passes regression and also fixes
> > > > > > > > > > > > > > > > the original ARM
> > > > > > > > > > > > > > > > kernel build issue with tumb2.
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > Did you try this with multiple assembler options?
> > > > > > > > > > > > > > > I see you stream
> > > > > > > > > > > > > > > them as -Wa,-mfpu=xyz,-mthumb but then compare
> > > > > > > > > > > > > > > the whole
> > > > > > > > > > > > > > > option strings so a mismatch with
> > > > > > > > > > > > > > > -Wa,-mthumb,-mfpu=xyz would be
> > > > > > > > > > > > > > > diagnosed. If there's a spec induced -Wa option
> > > > > > > > > > > > > > > do we get to see
> > > > > > > > > > > > > > > that as well? I can imagine -march=xyz enabling
> > > > > > > > > > > > > > > a -Wa option
> > > > > > > > > > > > > > > for example.
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > + *collect_as = XNEWVEC (char, strlen
> > > > > > > > > > > > > > > (args_text) + 1);
> > > > > > > > > > > > > > > + strcpy (*collect_as, args_text);
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > there's strdup. Btw, I'm not sure why you don't
> > > > > > > > > > > > > > > simply leave
> > > > > > > > > > > > > > > the -Wa option in the merged options
> > > > > > > > > > > > > > > [individually] and match
> > > > > > > > > > > > > > > them up but go the route of comparing strings and
> > > > > > > > > > > > > > > carrying that
> > > > > > > > > > > > > > > along separately. I think that would be much
> > > > > > > > > > > > > > > better.
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > Is attached patch which does this is OK?
> > > > > > > > > > > > > >
> > > > > > > > > > > > >
> > > > > > > > > > > > > Don't you need to also handle -Xassembler? Since -Wa,
> > > > > > > > > > > > > doesn't work with comma in
> > > > > > > > > > > > > assembler options, like -mfoo=foo1,foo2, one needs to
> > > > > > > > > > > > > use
> > > > > > > > > > > > >
> > > > > > > > > > > > > -Xassembler -mfoo=foo1,foo2
> > > > > > > > > > > > >
> > > > > > > > > > > > > to pass -mfoo=foo1,foo2 to assembler.
> > > > > > > > > > > >
> > > > > > > > > > > >
> > > > > > > > > > > > gcc -flto -O2 -Wa,-mcpu=zzz1 -mcpu=xxx1 -c foo.c
> > > > > > > > > > > > gcc -flto -O2 -Wa,-mcpu=zzz2 -mcpu=xxx2 -c bar.c
> > > > > > > > > > > >
> > > > > > > > > > > > What should be the option we should provide for the
> > > > > > > > > > > > final
> > > > > > > > > > > > gcc -flto foo.o bar.o -o out
> > > > > > > > > > > >
> > > > > > > > > > > > I think our ultimate aim is to handle this in LTO
> > > > > > > > > > > > partitioning. That
> > > > > > > > > > > > is, we should create partitioning such that each
> > > > > > > > > > > > partition has the
> > > > > > > > > > > > same -Wa options. This could also handle -Xassembler
> > > > > > > > > > > > -mfoo=foo1,foo2
> > > > > > > > > > > > which H.J. Lu wanted. We need to modify the heuristics
> > > > > > > > > > > > and do some
> > > > > > > > > > > > performance testing.
> > > > > > > > > > > >
> > > > > > > > > > > > In the meantime we could push a simpler solution which
> > > > > > > > > > > > is to accept
> > > > > > > > > > > > -Wa option if they are identical. This would fix at
> > > > > > > > > > > > least some of the
> > > > > > > > > > > > reported cases. Trying to work out what is compatible
> > > > > > > > > > > > options, even if
> > > > > > > > > > > > we ask the back-end to do this, is not a
> > > > > > > > > > > > straightforward strategy and
> > > > > > > > > > > > can be a maintenance nightmare. Unless we can query GNU
> > > > > > > > > > > > AS somehow. If
> > > > > > > > > > > > I am missing something please let me know.
> > > > > > > > > > >
> > > > > > > > > > > +/* Store switches specified for as with -Wa in
> > > > > > > > > > > COLLECT_AS_OPTIONS
> > > > > > > > > > > + and place that in the environment. */
> > > > > > > > > > > +static void
> > > > > > > > > > > +putenv_COLLECT_AS_OPTIONS (vec<char_p> vec)
> > > > > > > > > > > +{
> > > > > > > > > > > + unsigned ix;
> > > > > > > > > > > + char *opt;
> > > > > > > > > > > + int len = vec.length ();
> > > > > > > > > > > +
> > > > > > > > > > > + if (!len)
> > > > > > > > > > > + return;
> > > > > > > > > > > +
> > > > > > > > > > > + obstack_init (&collect_obstack);
> > > > > > > > > > > + obstack_grow (&collect_obstack, "COLLECT_AS_OPTIONS=",
> > > > > > > > > > > + sizeof ("COLLECT_AS_OPTIONS=") - 1);
> > > > > > > > > > > + obstack_grow (&collect_obstack, "-Wa,", strlen
> > > > > > > > > > > ("-Wa,"));
> > > > > > > > > > > +
> > > > > > > > > > > + FOR_EACH_VEC_ELT (vec, ix, opt)
> > > > > > > > > > > + {
> > > > > > > > > > > + obstack_grow (&collect_obstack, opt, strlen (opt));
> > > > > > > > > > > + --len;
> > > > > > > > > > > + if (len)
> > > > > > > > > > > + obstack_grow (&collect_obstack, ",", strlen (","));
> > > > > > > > > > > + }
> > > > > > > > > > > +
> > > > > > > > > > > + xputenv (XOBFINISH (&collect_obstack, char *));
> > > > > > > > > > >
> > > > > > > > > > > This missed the null terminator.
> > > > > > > > > >
> > > > > > > > > > Attached patch addresses the review comments I got so far.
> > > > > > > > > >
> > > > > > > > >
> > > > > > > > > + if (len)
> > > > > > > > > + obstack_grow (&collect_obstack, ",", strlen (","));
> > > > > > > > >
> > > > > > > > > Why not sizeof (",") - 1?
> > > > > > > > I guess I copied and pasted it from elsewhere else. We seem to
> > > > > > > > use
> > > > > > > > both. I have changed it now.
> > > > > > > >
> > > > > > > > >
> > > > > > > > > diff --git a/gcc/lto-wrapper.c b/gcc/lto-wrapper.c
> > > > > > > > > index 9a7bbd0c022..148c52906d1 100644
> > > > > > > > > --- a/gcc/lto-wrapper.c
> > > > > > > > > +++ b/gcc/lto-wrapper.c
> > > > > > > > > @@ -253,6 +253,11 @@ merge_and_complain (struct
> > > > > > > > > cl_decoded_option
> > > > > > > > > **decoded_options,
> > > > > > > > > break;
> > > > > > > > >
> > > > > > > > > default:
> > > > > > > > > + if (foption->opt_index == OPT_Wa_)
> > > > > > > > > + {
> > > > > > > > > + append_option (decoded_options,
> > > > > > > > > decoded_options_count, foption);
> > > > > > > > > + break;
> > > > > > > > > + }
> > > > > > > > > if (!(cl_options[foption->opt_index].flags & CL_TARGET))
> > > > > > > > > break;
> > > > > > > > >
> > > > > > > > > Why not use "case OPT_Wa_:" here?
> > > > > > > > Done.
> > > > > > > > >
> > > > > > > > > For
> > > > > > > > >
> > > > > > > > > + static const char *collect_as;
> > > > > > > > > + for (unsigned int j = 1; j < count; ++j)
> > > > > > > > > + {
> > > > > > > > > + struct cl_decoded_option *option = &opts[j];
> > > > > > > > > + if (j == 1)
> > > > > > > > > + collect_as = NULL;
> > > > > > > > >
> > > > > > > > > why not simply
> > > > > > > > >
> > > > > > > > > const char *collect_as = NULL?
> > > > > > > >
> > > > > > > > I wanted to make sure that if we call this from multiple
> > > > > > > > places, it
> > > > > > > > still works. I guess it is still going to be the same. I have
> > > > > > > > changed
> > > > > > > > it now as you have suggested.
> > > > > > > >
> > > > > > > > Is this revised patch OK? I will do a fresh bootstrap and
> > > > > > > > regression
> > > > > > > > testing before committing.
> > > > > > >
> > > > > > > In putenv_COLLECT_AS_OPTIONS you'll happily make
> > > > > > > -Wa,-march=foo,bar out of -Xassembler -march=foo,bar which
> > > > > > > will later cause us to fail to assemble with unknown assembler
> > > > > > > options.
> > > > > > > May I suggest to instead always use -Xassembler syntax in
> > > > > > > COLLECT_AS_OPTIONS? Please also make sure to quote
> > > > > > > options the same way set_collect_gcc_options does
> > > > > > > (with '', separated by spaces). Then the lto-opts.c part
> > > > > > > becomes "easier" as you can simply copy the string to the
> > > > > > > obstack without wrapping it again with
> > > > > > > append_to_collect_gcc_options.
> > > > > > >
> > > > > > > In lto-wrapper you then only have to handle OPT_Xassembler.
> > > > > > >
> > > > > > > You simply end up appending _all_ assembler options in order
> > > > > > > of TUs processed by lto-wrapper to the final command (N times
> > > > > > > even if exactly the same). I'm also not sure how you can check
> > > > > > > for positional equivalence (or if we even should). With -Wa
> > > > > > > we could compare the full option string but with separate
> > > > > > > -Xassembler
> > > > > > > we're having a more difficult task here. OTOH your patch doesn't
> > > > > > > do any comparing here.
> > > > > > >
> > > > > > > Your append_compiler_wa_options should be merged into
> > > > > > > append_compiler_options, passing -Xassembler through.
> > > > > > Hi Richard,
> > > > > > Since Kugan has left Linaro (and GCC), I'd like to take up this
> > > > > > task.
> > > > > > I have modified his patch to always pass assembler options via
> > > > > > -Xassembler.
> > > > > > Does it look OK ?
> > > > > >
> > > > > > I am not sure how we should proceed with error-checking for
> > > > > > Xassembler ?
> > > > > > In lto-wrapper, I suppose, we can append all Xassembler options for
> > > > > > a
> > > > > > TU into a single string, and then
> > > > > > do strcmp similar to previous patch(es) doing strcmp for -Wa options
> > > > > > string, although not sure if that's a good idea.
> > > > >
> > > > > I think there are multiple issues with the main one being how to
> > > > > actually interpret -Xassembler in the LTO context.
> > > > >
> > > > > First let me point out some bits in the COLLECT_AS_OPTIONS parts.
> > > > >
> > > > > + FOR_EACH_VEC_ELT (vec, ix, opt)
> > > > > + {
> > > > > + obstack_grow (&collect_obstack, "\'-Xassembler\' ",
> > > > > + strlen ("\'-Xassembler\' "));
> > > > >
> > > > > quoting of -Xassembler is not necessary.
> > > > >
> > > > > + obstack_1grow (&collect_obstack, '\'');
> > > > > + obstack_grow (&collect_obstack, opt, strlen (opt));
> > > > > + obstack_grow (&collect_obstack, "\' ", 2);
> > > > >
> > > > > This adds a stray space after the last option.
> > > > >
> > > > > Note that COLLECT_AS_OPTIONS gives the impression of listing
> > > > > assembler options but the above adds GCC driver options - assembler
> > > > > options prepended by -Xassembler. IMHO we should drop the
> > > > > -Xassembler emission from the above loop and simply emit the plain
> > > > > assembler options. That requires adjustments to lto_write_options,
> > > > > adding those -Xassembler options.
> > > > >
> > > > > + char *asm_opts = XOBFINISH (&collect_obstack, char *);
> > > > > + xputenv (XOBFINISH (&collect_obstack, char *));
> > > > > + xputenv (asm_opts);
> > > > >
> > > > > That outputs the ENV twice.
> > > > >
> > > > > Note that we record things like --version or --help into
> > > > > assembler_options but I'm not sure the merging of assembler
> > > > > options should be affected on whether one TU was compiled with -v
> > > > > or not. This might mean simply pruning those in lto-options.c
> > > > > (not listing them in COLLECT_AS_OPTIONS wouldn't tell the truth).
> > > > >
> > > > > @@ -252,6 +252,10 @@ merge_and_complain (struct cl_decoded_option
> > > > > **decoded_options,
> > > > > case OPT_SPECIAL_input_file:
> > > > > break;
> > > > >
> > > > > + case OPT_Xassembler:
> > > > > + append_option (decoded_options, decoded_options_count,
> > > > > foption);
> > > > > + break;
> > > > > +
> > > > >
> > > > > this adds the same option over-and-over again, possibly becoming
> > > > > unwieldly.
> > > > > Most of the function also assumes that option position isn't important
> > > > > which might or might not be true. So I think a better course of
> > > > > action
> > > > > would be to not handle Xassembler in the above loop but do a separate
> > > > > one checking 1:1 equality of passed assembler options like
> > > > >
> > > > > /* Verify -Xassembler options are the same on all TUs. */
> > > > > j = 0;
> > > > > i = 0;
> > > > > unsigned Xascount = 0;
> > > > > while (j < *decoded_options_count && i < fdeconded_options_count)
> > > > > {
> > > > > while (fdecoded_options[i].opt_index != OPT_Xassembler) ++i;
> > > > > same for *decoded_options
> > > > > if (stray Xassembler on one side)
> > > > > fatal_error (...);
> > > > > if (strcmp (...) != 0)
> > > > > fatal_error (...);
> > > > > }
> > > > >
> > > > > which means we use the -Xassembler options from the first TU and
> > > > > above only verify those match those from all other TUs.
> > > > Hi Richard,
> > > > Thanks for the suggestions, I tried to address them in the attached
> > > > patch.
> > > > It now gives errors on following cases during link command:
> > > >
> > > > 1]
> > > > gcc -O -flto -c -Xassembler -mfoo f1.c
> > > > gcc -O -flto -c f2.c
> > > > gcc -O -flto f1.o f2.o
> > > >
> > > > 2]
> > > > gcc -O -flto -c -Xassembler -mfoo f1.c
> > > > gcc -O -flto -c -Xassembler -mbar f2.c
> > > > gcc -O -flto f1.o f2.o
> > > >
> > > > 3]
> > > > gcc -O -flto -c -Xassembler -mfoo -Xassembler -mbar f1.c
> > > > gcc -O -flto -c -Xassembler -mbar -Xassembler -mfoo f2.c
> > > > gcc -O -flto f1.o f2.o
> > > >
> > > > 4]
> > > > gcc -O -flto -c f1.c
> > > > gcc -O -flto -Xassembler -mfoo f1.c
> > > > gcc -O -flto f1.o f2.o
> > > >
> > > > 5]
> > > > gcc -O -flto -Xassembler -mfoo f1.c
> > > > gcc -O -flto -Xassembler -mfoo f2.c
> > > > gcc -O -flto -Xassembler -mbar f1.o f2.o
> > > >
> > > > The following correct case works:
> > > > gcc -O -flto -Xassembler -mfoo f1.c
> > > > gcc -O -flto -Xassembler -mfoo f2.c
> > > > gcc -O -flto f1.o f2.o
> > >
> > > I think 5] should work as well and behave as -mfoo -mbar at assembler
> > > time.
> > > Add
> > >
> > > 6]
> > > gcc -O -flto f1.c
> > > gcc -O -flto f2.c
> > > gcc -O -flto -Xassembler -mfoo f1.o f2.o
> > >
> > > which should work as well (I think even this use doesn't work right now?)
> > >
> > > > Could you please suggest how to add the above cases in dejaGNU format ?
> > > > I am not sure how to write multiple files test with dejaGNU.
> > >
> > > look at multi-file testcases in gcc.dg/lto/, use testcase_0.c
> > > testcase_1.c,
> > > you can use dg-additional-options to pass -Xassembler (but eventually
> > > that doesn't work on the first TU), also there's some additional option
> > > for the link step directive (just look into the existing tests).
> > >
> > > > Also, do you think it's better if we append xassembler options to
> > > > COLLECT_GCC itself rather
> > > > than maintaining COLLECT_AS_OPTIONS with "Xassembler" prepended ?
> > > > Because in both lto_write_options,
> > > > and run_gcc, I am reconstructing "-Xassembler" <opt> for each opt in
> > > > COLLECT_AS_OPTIONS.
> > > >
> > > > I am not quite sure how Xassembler options were added to
> > > > fdecoded_options because I am not appending them
> > > > explicitly. IIUC, find_and_merge_options will add -Xassembler to
> > > > fdecoded_options when it's NULL ?
> > > > if (!fdecoded_options)
> > > > {
> > > > fdecoded_options = f2decoded_options;
> > > > fdecoded_options_count = f2decoded_options_count;
> > > > }
> > > > since merge_and_complain does not handle OPT_Xassembler.
> > >
> > > Yes.
> > >
> > > Comments on the patch. First avoid <algorithm>, just use MIN/MAX
> > > if really needed. I'd elide xassembler_opts[_count]. For 6] you want
> > > to unconditionally append the options.
> > >
> > > In find_and_merge_options I'd have avoided xassembler_opts[_count]
> > > by simply adding another nested loop over both decoded options
> > > requiring matching up OPT_Xassembler 1:1.
> > Hi Richard,
> > Thanks for the suggestions. The current patch removes
> > xasembler_opts[_count] and uses nested loop
> > for comparison.
> > In find_and_merge_options, I used curr_xopts[_count] to hold all the
> > options passed to current TU.
> > IIUC, f2decoded_options will be overwritten each time in the loop
> > while fetching strings from .opts section, and will
> > not contain all options passed to current TU. And I dropped validating
> > for cmdline opts which passes 5] and 6].
> > Does that look OK ?
>
> Huh, it looks odd. Why didn't you simply add the loop to merge_and_complain?
> That way you verify each TUs arguments against the first TUs.
My concern was that it might perhaps not work if .opts section in LTO
object file
contained multiple strings ? So fdecoded_options in merge_and_complain
may not hold all options passed to TU. Currently that isn't an issue,
since the section
contains only one string (since we append '\0' once at end of
lto_write_options).
I was wondering will this break if that changed and .opts contains
multiple strings instead ?
In attached patch, I placed the loop in merge_and_complain.
Does that look OK ?
>
> >
> > How should we handle conflicting argument to options passed on cmdline ?
> > For eg:
> > gcc -O -flto -Xassembler -mfoo=arg1 f1.c -o f1.o
> > gcc -O -flto -Xassembler -mfoo=arg1 f2.c -o f2.o
> > gcc -O -flto -Xassembler -mfoo=arg2 f1.o f2.o
> > Should we complain that arg1, arg2 differ or let arg2 take precedence
> > over arg1 for -mfoo ?
> > (It seems currently, the patch does latter).
>
> I think appending the linker -Xassembler makes most sense, appropriately
> diagnosing is difficult here and repeating compile-time assembler options
> will be common.
OK, thanks for the clarification.
Thanks,
Prathamesh
>
> Richard.
>
> >
> > I am still looking into the tests part, will address that in next patch.
> >
> > Thanks,
> > Prathamesh
> >
> >
> >
> >
> >
> >
> >
> > >
> > > Richard.
> > >
> > > >
> > > > Thanks,
> > > > Prathamesh
> > > > >
> > > > > Richard.
> > > > >
> > > > > > Thanks,
> > > > > > Prathamesh
> > > > > > >
> > > > > > > Thanks,
> > > > > > > Richard.
> > > > > > >
> > > > > > > > Thanks,
> > > > > > > > Kugan
> > > > > > > >
> > > > > > > > >
> > > > > > > > >
> > > > > > > > > H.J.
diff --git a/gcc/gcc.c b/gcc/gcc.c
index effc384f3ef..9f790db0daf 100644
--- a/gcc/gcc.c
+++ b/gcc/gcc.c
@@ -5242,6 +5242,34 @@ do_specs_vec (vec<char_p> vec)
}
}
+/* Add options passed via -Xassembler or -Wa to COLLECT_AS_OPTIONS. */
+
+static void
+putenv_COLLECT_AS_OPTIONS (vec<char_p> vec)
+{
+ if (vec.is_empty ())
+ return;
+
+ obstack_init (&collect_obstack);
+ obstack_grow (&collect_obstack, "COLLECT_AS_OPTIONS=",
+ strlen ("COLLECT_AS_OPTIONS="));
+
+ char *opt;
+ unsigned ix;
+
+ FOR_EACH_VEC_ELT (vec, ix, opt)
+ {
+ obstack_1grow (&collect_obstack, '\'');
+ obstack_grow (&collect_obstack, opt, strlen (opt));
+ obstack_1grow (&collect_obstack, '\'');
+ if (ix < vec.length () - 1)
+ obstack_1grow(&collect_obstack, ' ');
+ }
+
+ obstack_1grow (&collect_obstack, '\0');
+ xputenv (XOBFINISH (&collect_obstack, char *));
+}
+
/* Process the sub-spec SPEC as a portion of a larger spec.
This is like processing a whole spec except that we do
not initialize at the beginning and we do not supply a
@@ -7363,6 +7391,7 @@ driver::main (int argc, char **argv)
global_initializations ();
build_multilib_strings ();
set_up_specs ();
+ putenv_COLLECT_AS_OPTIONS (assembler_options);
putenv_COLLECT_GCC (argv[0]);
maybe_putenv_COLLECT_LTO_WRAPPER ();
maybe_putenv_OFFLOAD_TARGETS ();
diff --git a/gcc/lto-opts.c b/gcc/lto-opts.c
index 90bfde5a8fd..595be137ba9 100644
--- a/gcc/lto-opts.c
+++ b/gcc/lto-opts.c
@@ -163,6 +163,22 @@ lto_write_options (void)
append_to_collect_gcc_options (&temporary_obstack, &first_p,
option->canonical_option[j]);
}
+
+ char *collect_as_options = getenv ("COLLECT_AS_OPTIONS");
+ if (collect_as_options)
+ {
+ char *saveptr;
+ char *tok = strtok_r (collect_as_options, " ", &saveptr);
+
+ while (tok)
+ {
+ obstack_grow (&temporary_obstack, " '-Xassembler' ",
+ strlen (" '-Xassembler' "));
+ obstack_grow (&temporary_obstack, tok, strlen (tok));
+ tok = strtok_r (NULL, " ", &saveptr);
+ }
+ }
+
obstack_grow (&temporary_obstack, "\0", 1);
args = XOBFINISH (&temporary_obstack, char *);
lto_write_data (args, strlen (args) + 1);
diff --git a/gcc/lto-wrapper.c b/gcc/lto-wrapper.c
index fe8f292f877..fa3431414db 100644
--- a/gcc/lto-wrapper.c
+++ b/gcc/lto-wrapper.c
@@ -512,6 +512,30 @@ merge_and_complain (struct cl_decoded_option **decoded_options,
}
else
j++;
+
+ for (i = j = 0; ; i++, j++)
+ {
+ while (i < *decoded_options_count
+ && (*decoded_options)[i].opt_index != OPT_Xassembler)
+ i++;
+
+ while (j < fdecoded_options_count
+ && fdecoded_options[j].opt_index != OPT_Xassembler)
+ j++;
+
+ if (i == *decoded_options_count && j == fdecoded_options_count)
+ break;
+ else if (i < *decoded_options_count && j == fdecoded_options_count)
+ fatal_error (input_location, "Extra option to -Xassembler: %s.",
+ (*decoded_options)[i].arg);
+ else if (i == *decoded_options_count && j < fdecoded_options_count)
+ fatal_error (input_location, "Extra option to -Xassembler: %s.",
+ fdecoded_options[j].arg);
+ else if (strcmp ((*decoded_options)[i].arg, fdecoded_options[j].arg))
+ fatal_error (input_location,
+ "Options to Xassembler do not match: %s, %s.",
+ (*decoded_options)[i].arg, fdecoded_options[j].arg);
+ }
}
/* Auxiliary function that frees elements of PTR and PTR itself.
@@ -624,6 +648,7 @@ append_compiler_options (obstack *argv_obstack, struct cl_decoded_option *opts,
case OPT_Ofast:
case OPT_Og:
case OPT_Os:
+ case OPT_Xassembler:
break;
default:
@@ -1251,7 +1276,8 @@ run_gcc (unsigned argc, char *argv[])
const char **argv_ptr;
char *list_option_full = NULL;
const char *linker_output = NULL;
- const char *collect_gcc, *collect_gcc_options;
+ const char *collect_gcc;
+ char *collect_gcc_options;
int parallel = 0;
int jobserver = 0;
int auto_parallel = 0;
@@ -1281,6 +1307,34 @@ run_gcc (unsigned argc, char *argv[])
if (!collect_gcc_options)
fatal_error (input_location,
"environment variable %<COLLECT_GCC_OPTIONS%> must be set");
+
+ char *collect_as_options = getenv ("COLLECT_AS_OPTIONS");
+
+ /* Prepend -Xassembler to each option, and append the string
+ to collect_gcc_options. */
+ if (collect_as_options)
+ {
+ obstack temporary_obstack;
+ obstack_init (&temporary_obstack);
+
+ char *saveptr;
+ char *tok = strtok_r (collect_as_options, " ", &saveptr);
+
+ while (tok)
+ {
+ obstack_grow (&temporary_obstack, " '-Xassembler' ",
+ strlen (" '-Xassembler' "));
+ obstack_grow (&temporary_obstack, tok, strlen (tok));
+ tok = strtok_r (NULL, " ", &saveptr);
+ }
+
+ obstack_1grow (&temporary_obstack, '\0');
+
+ char *xassembler_opts_string
+ = XOBFINISH (&temporary_obstack, char *);
+ strcat (collect_gcc_options, xassembler_opts_string);
+ }
+
get_options_from_collect_gcc_options (collect_gcc, collect_gcc_options,
&decoded_options,
&decoded_options_count);
diff --git a/gcc/testsuite/gcc.target/arm/pr78353-1.c b/gcc/testsuite/gcc.target/arm/pr78353-1.c
new file mode 100644
index 00000000000..aec0fb0cbfd
--- /dev/null
+++ b/gcc/testsuite/gcc.target/arm/pr78353-1.c
@@ -0,0 +1,8 @@
+/* { dg-do link } */
+/* { dg-options "-march=armv7-a -mthumb -O2 -flto -Wa,-mimplicit-it=always" } */
+
+int main(int x)
+{
+ asm("teq %0, #0; addne %0, %0, #1" : "=r" (x));
+ return x;
+}
diff --git a/gcc/testsuite/gcc.target/arm/pr78353-2.c b/gcc/testsuite/gcc.target/arm/pr78353-2.c
new file mode 100644
index 00000000000..18a90e8834e
--- /dev/null
+++ b/gcc/testsuite/gcc.target/arm/pr78353-2.c
@@ -0,0 +1,9 @@
+/* { dg-do link } */
+/* { dg-options "-march=armv7-a -mthumb -O2 -flto -Wa,-mimplicit-it=always,-mthumb" } */
+
+int main(int x)
+{
+ asm("teq %0, #0; addne %0, %0, #1" : "=r" (x));
+ return x;
+}
+
