[Bug bootstrap/50229] New: [4.7 Regression] Can't cross compile for i686-apple-darwin10 from x86_64-redhat_linux

[Bug bootstrap/50229] New: [4.7 Regression] Can't cross compile for i686-apple-darwin10 from x86_64-redhat_linux

[vanboxem.ruben at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50229

             Bug #: 50229
           Summary: [4.7 Regression] Can't cross compile for
                    i686-apple-darwin10 from x86_64-redhat_linux
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: bootstrap
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: vanboxem.ruben@gmail.com


Created attachment 25130
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=25130
toplevel config.log

I am cross-compiling a 
HOST=i686-apple-darwin10
BUILD=x86_64-redhat-linux
TARGET=i686-w64_mingw32
cross-compiler.

GCC 4.6 (and most probably 4.5) work fine, GCC 4.7 misconfigures and results in
a build failure.

Attached is top-level toplevel config.log, more to follow.

[Bug bootstrap/50229] [4.7 Regression] Can't cross compile for i686-apple-darwin10 from x86_64-redhat_linux

[vanboxem.ruben at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50229

Ruben Van Boxem <vanboxem.ruben at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #25130|0                           |1
        is obsolete|                            |

--- Comment #1 from Ruben Van Boxem <vanboxem.ruben at gmail dot com> 2011-08-29 18:22:32 UTC ---
Created attachment 25131
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=25131
toplevel config.log

Add proper toplevel config.log

[Bug bootstrap/50229] [4.7 Regression] Can't cross compile for i686-apple-darwin10 from x86_64-redhat_linux

[vanboxem.ruben at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50229

--- Comment #2 from Ruben Van Boxem <vanboxem.ruben at gmail dot com> 2011-08-29 18:23:12 UTC ---
Created attachment 25132
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=25132
gcc/config.log

Attached gcc/config.log

[Bug bootstrap/50229] [4.7 Regression] Can't cross compile for i686-apple-darwin10 from x86_64-redhat_linux

[vanboxem.ruben at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50229

--- Comment #3 from Ruben Van Boxem <vanboxem.ruben at gmail dot com> 2011-08-29 18:26:10 UTC ---
Created attachment 25133
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=25133
Compressed build log detailing failure

Attached build log. ("make all-gcc" output)

[Bug bootstrap/50229] [4.7 Regression] Can't cross compile for i686-apple-darwin10 from x86_64-redhat_linux

[vanboxem.ruben at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50229

--- Comment #4 from Ruben Van Boxem <vanboxem.ruben at gmail dot com> 2011-08-29 18:30:29 UTC ---
For those wondering how on Earth I am cross-compiling for Mac, see
http://build1.openftd.org/fedora-cross-darwinx/

This is a cross toolchain for Fedora, which works quite well.
The version used in the build is:
Using built-in specs.
Target: i686-apple-darwin10
Configured with: ../configure --prefix=/usr --bindir=/usr/bin
--includedir=/usr/include --libdir=/usr/lib64 --mandir=/usr/share/man
--infodir=/usr/share/info --datadir=/usr/share --build=x86_64-unknown-linux-gnu
--host=x86_64-unknown-linux-gnu --target=i686-apple-darwin10
--enable-languages=c,objc,c++,obj-c++
--with-sysroot=/usr/darwinx/SDKs/MacOSX10.5.sdk --with-as=/usr/bin/darwinx-as
--with-ld=/usr/bin/darwinx-ld --enable-static --enable-shared --disable-nls
--enable-multilib --enable-libssp
Thread model: posix
gcc version 4.2.1 (Apple Inc. build 5664)

[Bug bootstrap/50229] [4.7 Regression] Can't cross compile for i686-apple-darwin10 from x86_64-redhat_linux

[iains at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50229

Iain Sandoe <iains at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |iains at gcc dot gnu.org

--- Comment #5 from Iain Sandoe <iains at gcc dot gnu.org> 2011-09-08 07:38:33 UTC ---
Not necessarily related to your specific problem - but a "heads up":

I've just committed a change to the Darwin port that will make the compiler
(better) use the target system headers.

However, it will also accentuate the issue that you are targeting Darwin10
using a Darwin9 system framework and toolset.  

You will need to fake a darwin10 "ld" that can handle the "-no_compact_unwind"
unwind flag (or comment that section out of config/darwin10.h).

Until someone has time to update odcctools or toolwhip to a Darwin10 version, I
wonder if it is not simply easier to build an i686-Darwin9 executable? (which
should run fine on Darwin10)

[Bug bootstrap/50229] [4.7 Regression] Can't cross compile for i686-apple-darwin10 from x86_64-redhat_linux

[iains at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50229

--- Comment #6 from Iain Sandoe <iains at gcc dot gnu.org> 2011-09-08 07:43:03 UTC ---
(In reply to comment #5)
> Not necessarily related to your specific problem - but a "heads up":
> 
> I've just committed a change to the Darwin port that will make the compiler
> (better) use the target system headers.
> 
> However, it will also accentuate the issue that you are targeting Darwin10
> using a Darwin9 system framework and toolset.  
> 
> You will need to fake a darwin10 "ld" that can handle the "-no_compact_unwind"
> unwind flag (or comment that section out of config/darwin10.h).
> 
> Until someone has time to update odcctools or toolwhip to a Darwin10 version, I
> wonder if it is not simply easier to build an i686-Darwin9 executable? (which
> should run fine on Darwin10)

(this relates to the host libs and tools of course - not the mingw_32 stuff).

[Bug bootstrap/50229] [4.7 Regression] Can't cross compile for i686-apple-darwin10 from x86_64-redhat_linux

[vanboxem.ruben at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50229

--- Comment #7 from Ruben Van Boxem <vanboxem.ruben at gmail dot com> 2011-09-19 19:28:48 UTC ---
I'm still experiencing the same behavior.

I don't think the darwinx toolchain has the problems you say? Why do you think
it uses a Darwin9 system framework and headers? It has GCC 4.2.1 and the Mac OS
X 10.5 SDK, which are all pretty Darwin10 as far as I can see.

Something changed in 4.6 vs 4.7. I have sys/malloc.h , objc/malloc.h, and
malloc/malloc.h. Somehow, HAVE_MALLOC_H is being wrongfully defined to 1 when
it should be 0.

auto-host.h has the define commented out.
auto-build.h has it defined.

These are the same for GCC 4.6. So the problem must lie elsewhere...

I noticed the gengtype-lex.o object file is build with i686-apple-darwin10-gcc
for GCC 4.7, and (Linux) gcc for GCC 4.6. This cannot be intended behavior.

[Bug bootstrap/50229] [4.7 Regression] Can't cross compile for i686-apple-darwin10 from x86_64-redhat_linux

[iains at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50229

Iain Sandoe <iains at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |peter at pogma dot com

--- Comment #8 from Iain Sandoe <iains at gcc dot gnu.org> 2011-09-19 19:45:38 UTC ---
(In reply to comment #7)
> I'm still experiencing the same behavior.

yes, I would guess so unless you re-build the cross tools (and that would
probably not solve your config problems - given the other comments you made)
...

>  I don't think the darwinx toolchain has the problems you say? Why do you think
> it uses a Darwin9 system framework and headers? It has GCC 4.2.1 and the Mac OS
> X 10.5 SDK, which are all pretty Darwin10 as far as I can see.

OSX 10.5 is darwin 9 (and gcc 4.2.1 is perfectly usable under OSX10.5/darwin9 -
it's just not the default).

Target: i686-apple-darwin10
Configured with: ../configure --prefix=/usr --bindir=/usr/bin
--includedir=/usr/include --libdir=/usr/lib64 --mandir=/usr/share/man
--infodir=/usr/share/info --datadir=/usr/share --build=x86_64-unknown-linux-gnu
--host=x86_64-unknown-linux-gnu --target=i686-apple-darwin10
--enable-languages=c,objc,c++,obj-c++
--with-sysroot=/usr/darwinx/SDKs/MacOSX10.5.sdk 
 .........................................................^^^^^^^^^^^^

I'm not aware of a genuine darwin10 (OSX 10.6) cross-toolchain - but if there
is I'd love to see it (I'm only aware of toolwhip and odcctools which are both
on the darwin9  ld64 AFAIK).

[Bug bootstrap/50229] [4.7 Regression] Can't cross compile for i686-apple-darwin10 from x86_64-redhat_linux

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50229

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|                            |i686-apple-darwin10
               Host|                            |x86_64-linux
   Target Milestone|---                         |4.7.0

[Bug bootstrap/50229] [4.7 Regression] Can't cross compile for i686-apple-darwin10 from x86_64-redhat_linux

[vanboxem.ruben at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50229

--- Comment #9 from Ruben Van Boxem <vanboxem.ruben at gmail dot com> 2011-10-26 12:49:43 UTC ---
I received a build of a darwinx-ld binary from the darwinx toolchain maintainer
that accepts the -no_compact_unwind option, and the problem has not gone away.
Configure is either using the wrong headers for the build or configure is
messing up.

[Bug bootstrap/50229] [4.7 Regression] Can't cross compile for i686-apple-darwin10 from x86_64-redhat_linux

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50229

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P4
           Severity|major                       |normal

--- Comment #10 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-01-19 12:42:40 UTC ---
i686-apple-darwin10 isn't a cross-only target but also a host platform.

[Bug bootstrap/50229] [4.7/4.8 Regression] Can't cross compile for i686-apple-darwin10 from x86_64-redhat_linux

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50229

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.7.0                       |4.7.1

--- Comment #11 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-03-22 08:25:57 UTC ---
GCC 4.7.0 is being released, adjusting target milestone.

[Bug bootstrap/50229] [4.7/4.8 Regression] Can't cross compile for i686-apple-darwin10 from x86_64-redhat_linux

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50229

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.7.1                       |4.7.2

--- Comment #12 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-06-14 08:09:31 UTC ---
GCC 4.7.1 is being released, adjusting target milestone.

[Bug bootstrap/50229] [4.7/4.8 Regression] Can't cross compile for i686-apple-darwin10 from x86_64-redhat_linux

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50229

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.7.2                       |4.7.3

--- Comment #13 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-09-20 10:12:40 UTC ---
GCC 4.7.2 has been released.

[Bug bootstrap/50229] [4.7/4.8 Regression] Can't cross compile for i686-apple-darwin10 from x86_64-redhat_linux

[mingw.android at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50229

Ray Donnelly <mingw.android at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mingw.android at gmail dot
                   |                            |com

--- Comment #14 from Ray Donnelly <mingw.android at gmail dot com> 2013-01-15 15:56:00 UTC ---
> Until someone has time to update odcctools or toolwhip to a Darwin10 version, I wonder if it is not simply easier to build an i686-Darwin9 executable? (which should run fine on Darwin10)

I've done this. I started from javacom's toolchain4 which uses odcctools. I
heavily patched odcctools to bring them more up to date. Eventually, the hope
is to merge these cross compilers with the crosstool-ng project.

For now though, you can find the source code here:
https://github.com/mingwandroid/toolchain4 (master branch should build ok with
./build-all.sh apple provided you've got MacOSX10.7.sdk)

..and binaries here (again to use these you need MacOSX10.7.sdk):
http://mingw-and-ndk.googlecode.com/files/multiarch-darwin11-cctools127.2-gcc42-5666.3-llvmgcc42-2336.1-Linux-120724.tar.xz
http://mingw-and-ndk.googlecode.com/files/multiarch-darwin11-cctools127.2-gcc42-5666.3-llvmgcc42-2336.1-Windows-120614.7z
http://mingw-and-ndk.googlecode.com/files/multiarch-darwin11-cctools127.2-gcc42-5666.3-llvmgcc42-2336.1-Darwin-120615.7z

(the Darwin native build is provided too for testing/QA purposes).

[Bug bootstrap/50229] [4.7/4.8 Regression] Can't cross compile for i686-apple-darwin10 from x86_64-redhat_linux

[mingw.android at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50229

--- Comment #15 from Ray Donnelly <mingw.android at gmail dot com> 2013-01-15 16:07:45 UTC ---
What brought me here was a desire to add some information about this bug, when
I saw the odcctools comment from Iain I thought I may as well mention my
compilers.

Further Information:

I'm also getting this when trying to build some Android cross compilers in the
Canadian way, with failures when host is either Darwin or Windows. The bug only
happens if --enable-plugins is specified to configure (as that's what triggers
building a gengtype executable for the host machine).

Darwin:
build system type... x86_64-pc-linux-gnu
host system type... i686-apple-darwin
target system type... arm-unknown-linux-androideabi
i686-apple-darwin-gcc -c -DIN_GCC -DCROSS_DIRECTORY_STRUCTURE  
-DGENERATOR_FILE -I. -Ibuild
-I/tmp/necessitas/android-qt-ndk/toolchain-source/gcc/gcc-4.7/gcc
-I/tmp/necessitas/android-qt-ndk/toolchain-source/gcc/gcc-4.7/gcc/build
-I/tmp/necessitas/android-qt-ndk/toolchain-source/gcc/gcc-4.7/gcc/../include
-I/tmp/necessitas/android-qt-ndk/toolchain-source/gcc/gcc-4.7/gcc/../libcpp/include
-I/tmp/necessitas/ndk-build/build/host-gcc/i686-apple-darwin/temp-prereqs/include
-I/tmp/necessitas/ndk-build/build/host-gcc/i686-apple-darwin/temp-prereqs/include
-I/tmp/necessitas/ndk-build/build/host-gcc/i686-apple-darwin/temp-prereqs/include

-I/tmp/necessitas/android-qt-ndk/toolchain-source/gcc/gcc-4.7/gcc/../libdecnumber
-I/tmp/necessitas/android-qt-ndk/toolchain-source/gcc/gcc-4.7/gcc/../libdecnumber/dpd
-I../libdecnumber -o build/genconstants.o
/tmp/necessitas/android-qt-ndk/toolchain-source/gcc/gcc-4.7/gcc/genconstants.c
In file included from
/tmp/necessitas/android-qt-ndk/toolchain-source/gcc/gcc-4.7/gcc/genconstants.c:29:
/tmp/necessitas/android-qt-ndk/toolchain-source/gcc/gcc-4.7/gcc/system.h:459:20:
error: malloc.h: No such file or directory

Windows:
build system type... x86_64-pc-linux-gnu
host system type... i686-w64-mingw32msvc
target system type... arm-unknown-linux-androideabi
i686-w64-mingw32msvc-gcc -c   -Os -fomit-frame-pointer -s -D__USE_MINGW_ACCESS
-DIN_GCC -DCROSS_DIRECTORY_STRUCTURE  -W -Wall -Wno-narrowing -Wwrite-strings
-Wcast-qual -Wstrict-prototypes -Wmissing-prototypes -Wmissing-format-attribute
-pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings
-Wold-style-definition -Wc++-compat   -DHAVE_CONFIG_H -I. -I.
-I/tmp/necessitas/android-qt-ndk/toolchain-source/gcc/gcc-4.7/gcc
-I/tmp/necessitas/android-qt-ndk/toolchain-source/gcc/gcc-4.7/gcc/.
-I/tmp/necessitas/android-qt-ndk/toolchain-source/gcc/gcc-4.7/gcc/../include
-I/tmp/necessitas/android-qt-ndk/toolchain-source/gcc/gcc-4.7/gcc/../libcpp/include
-I/tmp/necessitas/ndk-build/build/host-gcc/i686-w64-mingw32msvc/temp-prereqs/include
-I/tmp/necessitas/ndk-build/build/host-gcc/i686-w64-mingw32msvc/temp-prereqs/include
-I/tmp/necessitas/ndk-build/build/host-gcc/i686-w64-mingw32msvc/temp-prereqs/include

-I/tmp/necessitas/android-qt-ndk/toolchain-source/gcc/gcc-4.7/gcc/../libdecnumber
-I/tmp/necessitas/android-qt-ndk/toolchain-source/gcc/gcc-4.7/gcc/../libdecnumber/dpd
-I../libdecnumber   
/tmp/necessitas/android-qt-ndk/toolchain-source/gcc/gcc-4.7/gcc/genconstants.c
-o genconstants.o
In file included from
/tmp/necessitas/android-qt-ndk/toolchain-source/gcc/gcc-4.7/gcc/genconstants.c:29:0:
/tmp/necessitas/android-qt-ndk/toolchain-source/gcc/gcc-4.7/gcc/system.h:351:22:
fatal error: sys/wait.h: No such file or directory

...so as Ruben said, it seems that there's config confusion going on.

[Bug bootstrap/50229] [4.7/4.8 Regression] Can't cross compile for i686-apple-darwin10 from x86_64-redhat_linux

[mingw.android at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50229

--- Comment #16 from Ray Donnelly <mingw.android at gmail dot com> 2013-01-16 07:59:48 UTC ---
Of course, when I wrote '--enable-plugins' I really mean't *not* passing
--disable-plugin (without the 's').

[Bug bootstrap/50229] [4.7/4.8/4.9 Regression] Can't cross compile for i686-apple-darwin10 from x86_64-redhat_linux

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50229

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.7.3                       |4.7.4

--- Comment #17 from Richard Biener <rguenth at gcc dot gnu.org> 2013-04-11 07:58:41 UTC ---
GCC 4.7.3 is being released, adjusting target milestone.

[Bug bootstrap/50229] [4.7/4.8/4.9 Regression] Can't cross compile for i686-apple-darwin10 from x86_64-redhat_linux

[jackie.rosen at hushmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50229

Jackie Rosen <jackie.rosen at hushmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jackie.rosen at hushmail dot com

--- Comment #18 from Jackie Rosen <jackie.rosen at hushmail dot com> ---
*** Bug 260998 has been marked as a duplicate of this bug. ***
Seen from the domain http://volichat.com
Page where seen: http://volichat.com/adult-chat-rooms
Marked for reference. Resolved as fixed @bugzilla.

[Bug bootstrap/50229] [4.7/4.8/4.9/4.10 Regression] Can't cross compile for i686-apple-darwin10 from x86_64-redhat_linux

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=50229

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.7.4                       |4.8.4

--- Comment #19 from Richard Biener <rguenth at gcc dot gnu.org> ---
The 4.7 branch is being closed, moving target milestone to 4.8.4.

[Bug bootstrap/50229] [4.8/4.9/5 Regression] Can't cross compile for i686-apple-darwin10 from x86_64-redhat_linux

[fxcoudert at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=50229

Francois-Xavier Coudert <fxcoudert at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |fxcoudert at gcc dot gnu.org

--- Comment #20 from Francois-Xavier Coudert <fxcoudert at gcc dot gnu.org> ---
This PR appears to report two different issues:
  1. cross-compiler targeting Darwin
  2. cross-compiler hosted on Darwin

The first one, as far as I know, simply doesn't work for recent darwin
versions, due to lack of compiler tools (cross assembler and linker). Is that
correct?

For the second, could someone post a clear and up-to-date example of when it
doesn't work?

[Bug bootstrap/50229] [4.8/4.9/5 Regression] Can't cross compile for i686-apple-darwin10 from x86_64-redhat_linux

[fxcoudert at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=50229

Francois-Xavier Coudert <fxcoudert at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2014-11-08
     Ever confirmed|0                           |1

[Bug bootstrap/50229] [4.8/4.9/5 Regression] Can't cross compile for i686-apple-darwin10 from x86_64-redhat_linux

[iains at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=50229

--- Comment #21 from Iain Sandoe <iains at gcc dot gnu.org> ---
(In reply to Francois-Xavier Coudert from comment #20)
> This PR appears to report two different issues:
>   1. cross-compiler targeting Darwin

cross-compilers targeting Darwin <= 9 are possible using odcctools.

For "the future"
I am working on a set of GCC patches and a GAS port that solves part of the
problem for newer cases.  I intend to post these before stage#1 ends (but time
is short - esp. with trunk trashed on darwin at the moment).

However the static linker remains an issue (I have a build of ld64-127.2 which
supports Darwin10, and ppc*) … however, this needs to be forward-ported to the
latest published sources for ld64 before it will support "current" Darwin.  

In any event, it would be the User's responsibility to obtain a suitable SDK
for the target - by downloading the appropriate Xcode and extracting the SDK as
needed.

in short: "can't be expected to work until there's a set of Darwin 'binutils'
supporting > darwin 9". (working on providing that).

>   2. cross-compiler hosted on Darwin

I do this all the time - it's possible to cross from x86_64-darwin12 ->
powerpc-darwin9, for example (assuming one has the relevant cctools and ld64,
and enough patience).

I have also built native-crosses [x86-64-darwin12=build powerpc-darwin8
host/target] for the record.

Darwin works just fine as a host for cross-compilers to Linux.

(building your own sysroot - in particular GLIBC can be a trial, but if you
make a sysroot from a standard distro, it's not hard).

in short (2) is very definitely "works for me"
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From: "howarth at bromo dot med.uc.edu" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libitm/63781] potential linkage issue with libitm.1.dylib
Date: Sat, 08 Nov 2014 18:11:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idc781

--- Comment #2 from howarth at bromo dot med.uc.edu ---
The missing linkage on libstdc++ would be solved by making sure that the
/sw/src/fink.build/gcc50-5.0.0-1000/darwin_objdir/./gcc/xg++ compiler is used
to link libitm rather than the current
/sw/src/fink.build/gcc50-5.0.0-1000/darwin_objdir/./gcc/xgcc.

[Bug bootstrap/50229] [4.8/4.9/5 Regression] Can't cross compile for i686-apple-darwin10 from x86_64-redhat_linux

[fxcoudert at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=50229

--- Comment #22 from Francois-Xavier Coudert <fxcoudert at gcc dot gnu.org> ---
(In reply to Iain Sandoe from comment #21)
> in short (2) is very definitely "works for me"

For me too: I regularly build darwin-to-mingw-w64 cross compilers, with no
problem at all. But there were, apparently, problems with Canadian crosses
(comments by Ray Donnelly).

[Bug bootstrap/50229] [4.8/4.9/5 Regression] Can't cross compile for i686-apple-darwin10 from x86_64-redhat_linux

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=50229

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.8.4                       |4.8.5

--- Comment #23 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 4.8.4 has been released.

[Bug bootstrap/50229] [4.8/4.9/5/6 Regression] Can't cross compile for i686-apple-darwin10 from x86_64-redhat_linux

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=50229

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.8.5                       |4.9.3

--- Comment #24 from Richard Biener <rguenth at gcc dot gnu.org> ---
The gcc-4_8-branch is being closed, re-targeting regressions to 4.9.3.

[Bug bootstrap/50229] [4.9/5/6 Regression] Can't cross compile for i686-apple-darwin10 from x86_64-redhat_linux

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=50229

--- Comment #25 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 4.9.3 has been released.

[Bug bootstrap/50229] [4.9/5/6 Regression] Can't cross compile for i686-apple-darwin10 from x86_64-redhat_linux

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=50229

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.9.3                       |4.9.4

[Bug bootstrap/50229] [9/10/11/12 Regression] Can't cross compile for i686-apple-darwin10/11/12 from x86_64-redhat_linux

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=50229

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|8.5                         |9.4

--- Comment #34 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8 branch is being closed.

[Bug bootstrap/50229] [9/10/11/12 Regression] Can't cross compile for i686-apple-darwin10/11/12 from x86_64-redhat_linux

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=50229

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|9.4                         |9.5

--- Comment #35 from Richard Biener <rguenth at gcc dot gnu.org> ---
GCC 9.4 is being released, retargeting bugs to GCC 9.5.

[Bug bootstrap/50229] [10/11/12/13 Regression] Can't cross compile for i686-apple-darwin10/11/12 from x86_64-redhat_linux

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=50229

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|9.5                         |10.4

--- Comment #36 from Richard Biener <rguenth at gcc dot gnu.org> ---
GCC 9 branch is being closed

[Bug bootstrap/50229] [10/11/12/13 Regression] Can't cross compile for i686-apple-darwin10/11/12 from x86_64-redhat_linux

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=50229

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|10.4                        |10.5

--- Comment #37 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 10.4 is being released, retargeting bugs to GCC 10.5.

[Bug bootstrap/50229] [11/12/13/14 Regression] Can't cross compile for i686-apple-darwin10/11/12 from x86_64-redhat_linux

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=50229

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|10.5                        |11.5

--- Comment #38 from Richard Biener <rguenth at gcc dot gnu.org> ---
GCC 10 branch is being closed.