Stubdom compilation failure on Fedora 24 beta

["Marek Marczykowski-Górecki" <marmarek@invisiblethingslab.com>]

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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:

    0x000000000040063d <+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)


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?

-- 
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?

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