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Subject: Re: micropython djgpp build
From: "multisosnooley AT gmail DOT com [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
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On Tuesday, January 31, 2017 at 5:41:12 PM UTC+3, multiso DOT  DOT  DOT  AT gmail DOT com wrote:
> On Tuesday, January 31, 2017 at 4:54:20 PM UTC+3, Louis Santillan (lpsantil AT gmail DOT com) [via djgpp AT delorie DOT com] wrote:
> > Can you replace CFLAGS/LDFLAGS to exclude the `--gc-sections`?
> > 
> > On Tue, Jan 31, 2017 at 2:48 AM, multisosnooley AT gmail DOT com [via
> > djgpp AT delorie DOT com] <djgpp AT delorie DOT com> wrote:
> > > On Thursday, January 26, 2017 at 3:13:00 AM UTC+3, multiso DOT  DOT  DOT  AT gmail DOT com wrote:
> > >> On Wednesday, January 25, 2017 at 6:19:02 PM UTC+3, Ozkan Sezer (sezeroz AT gmail DOT com) [via djgpp AT delorie DOT com] wrote:
> > >> > On 1/25/17, multisosnooley AT gmail DOT com [via djgpp AT delorie DOT com]
> > >> > <djgpp AT delorie DOT com> wrote:
> > >> > > On Wednesday, January 25, 2017 at 3:07:30 PM UTC+3, Ozkan Sezer
> > >> > > (sezeroz AT gmail DOT com) [via djgpp AT delorie DOT com] wrote:
> > >> > >> On 1/25/17, multisosnooley AT gmail DOT com [via djgpp AT delorie DOT com]
> > >> > >> <djgpp AT delorie DOT com> wrote:
> > >> > >> > Hi!
> > >> > >> >
> > >> > >> > We have a problem with building micropython with djgpp with
> > >> > >> > '--gc-sections'
> > >> > >> > flag active. It segfaults on linking.
> > >> > >> > More info:
> > >> > >> > https://github.com/micropython/micropython/issues/2560
> > >> > >> > https://github.com/micropython/micropython/pull/2644
> > >> > >> >
> > >> > >>
> > >> > >> Possibly related to this?
> > >> > >> https://sourceware.org/bugzilla/show_bug.cgi?id=20401
> > >> > >>
> > >> > >> Which binutils version are you using?
> > >> > >
> > >> > > I don't exactly now which version of binutils was used in previous cases,
> > >> > > but right now newest available is
> > >> > > http://www.delorie.com/pub/djgpp/deleted/v2gnu/bnu226sr3.zip and in bug you
> > >> > > reference fix comes in 2.27, but it is not released yet. Or?
> > >> > >
> > >> >
> > >> > There is a djgpp port of 2.27:
> > >> > http://www.delorie.com/pub/djgpp/current/v2gnu/bnu227s.zip
> > >> > http://www.delorie.com/pub/djgpp/current/v2gnu/bnu227b.zip
> > >> > Besides, the fix is (should be) applicable to 2.26 too.
> > >> >
> > >> > Looking at the links you provided:
> > >> > https://github.com/micropython/micropython/issues/2560#issuecomment-260157891
> > >> > mentions binutils 2.20.1.20100303: if that is version giving you the
> > >> > segfault then I don't know, because but as far as I remember the
> > >> > --gc-sections support for coff and pe targets began with
> > >> > https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=0f088b2a
> > >> > and that corresponds to either 2.25.1 or 2.26
> > >>
> > >> Just tested:
> > >>
> > >> [poh ~/tmp/upython]$ cat test.c
> > >> int main () { return 0; }
> > >> [poh ~/tmp/upython]$ djgpp-6.2.0/bin/i586-pc-msdosdjgpp-gcc -Wl,--gc-sections test.c
> > >> collect2: fatal error: ld terminated with signal 11 [Segmentation fault], core dumped
> > >> compilation terminated.
> > >> [poh ~/tmp/upython]$ djgpp-6.2.0/bin/i586-pc-msdosdjgpp-gcc --version
> > >> i586-pc-msdosdjgpp-gcc (GCC) 6.2.0
> > >> Copyright (C) 2016 Free Software Foundation, Inc.
> > >> This is free software; see the source for copying conditions.  There is NO
> > >> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
> > >>
> > >> [poh ~/tmp/upython]$ djgpp-6.2.0/bin/i586-pc-msdosdjgpp-ld --version
> > >> GNU ld (GNU Binutils) 2.26.20160125
> > >> Copyright (C) 2015 Free Software Foundation, Inc.
> > >> This program is free software; you may redistribute it under the terms of
> > >> the GNU General Public License version 3 or (at your option) a later version.
> > >> This program has absolutely no warranty.
> > >>
> > >> Will try to test with 2.27
> > >
> > > Unfortunately, building djgpp with 2.27s failed with:
> > > ../bfd/.libs/libbfd.a(coff-go32.o): In function `coff_swap_scnhdr_in':
> > > /home/broomrider/tmp/upython/build-djgpp/build/bnu227s/gnu/binutils-2.27/bfd/coffswap.h:775: undefined reference to `coff_64k_relocation_enabled'
> > > ../bfd/.libs/libbfd.a(coff-go32.o): In function `coff_swap_scnhdr_out':
> > > /home/broomrider/tmp/upython/build-djgpp/build/bnu227s/gnu/binutils-2.27/bfd/coffswap.h:815: undefined reference to `coff_64k_relocation_enabled'
> > > ../bfd/.libs/libbfd.a(coff-go32.o): In function `coff_set_alignment_hook':
> > > /home/broomrider/tmp/upython/build-djgpp/build/bnu227s/gnu/binutils-2.27/bfd/coffcode.h:1990: undefined reference to `coff_64k_relocation_enabled'
> > > ../bfd/.libs/libbfd.a(coff-stgo32.o): In function `_bfd_go32_mkobject':
> > > /home/broomrider/tmp/upython/build-djgpp/build/bnu227s/gnu/binutils-2.27/bfd/coff-stgo32.c:454: undefined reference to `coff_64k_relocation_enabled'
> > >
> > > I found this:
> > > https://groups.google.com/d/msg/comp.os.msdos.djgpp/mUOzbTpE1Sk/ODqAENwlAgAJ
> > > But, as I realized, there is no solution right now.
> 
> You mean for test code? If I omit `--gc-sections` everything work as expected. The question is exactly about `--gc-sections` and why linker crashes. Probably binutils 2.27 will solve the problem, but I can't build it.

Ok, with 2.27 everything work as expected.