Hi Marek
On Fri, May 13, 2016 at 02:35:21PM +0200, Marek Marczykowski-Górecki wrote:
> Hi,
>
> I'm trying to build Xen 4.6.1 on Fedora 24 beta. Since gcc 6, I need to pull
> some patches from unstable, but then I hit some strange problem:
>
> During configure run in stubdom/gmp-x86_64 I've got:
>
> checking size of unsigned short... configure: error: cannot compute
> sizeof (unsigned short)
> See `config.log' for more details.
>
> It turned out the failing line in conftest is:
>
> return ferror (f) || fclose (f) != 0;
>
> ferror(f) returned 1.
> That's strange, when running under gdb, manually checking ferror(f) (`p
> ferror(f)`) returns 0. So I've looked at code produced (after slight
> modification to have "if (ferror(f)) ..."), ferror(f) was turned to:
>
> 0x0040063d <+55>:testb $0x40,0x10(%rbx)
>
> This doesn't look like ferror from glibc. And 0x40 is not _IO_ERR_SEEN (0x20).
>
> This looks like ferror from newlib
> (stubdom/newlib-1.16.0/newlib/libc/include/stdio.h):
>
> #define __SERR 0x0040 /* found error */
> #define __sferror(p)(((p)->_flags & __SERR) != 0)
> #define ferror(p) __sferror(p)
>
Yes, it should be from newlib. This is expected because stubdom uses
newlib after all.
>
> Configure is called this way (stubdom/Makefile):
> cd $@; CPPFLAGS="-isystem
> $(CROSS_PREFIX)/$(GNU_TARGET_ARCH)-xen-elf/include $(TARGET_CPPFLAGS)"
> CFLAGS="$(TARGET_CFLAGS)" CC=$(CC) $(GMPEXT) ./configure --disable-shared
> --enable-static --disable-fft --without-readline
> --prefix=$(CROSS_PREFIX)/$(GNU_TARGET_ARCH)-xen-elf
>
> And indeed $(CROSS_PREFIX)/$(GNU_TARGET_ARCH)-xen-elf/include contains headers
> from newlib.
>
> Any idea how to fix this? And why it was working before?
>
You're not the first one that got bitten by this.
Search for
Error compiling Xen in configuring stubdom/gmp with glibc-2.23 on Arch Linux
or message-id
<1457311127.3237075.541322218.485cf...@webmail.messagingengine.com>
in xen-users@ archive.
The thread contains some analysis, but it's not yet complete.
There are two possibilities that I can think of off the top of my head:
1. the cross-build environment is buggy 2. newlib bit-rots too much.
The first requires fixing the build environment, the second requires
patching newlib (preferable imo) or upgrading it to a newer version.
It's on our radar but Ian and I are working on other things at the
moment.
Wei.
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