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configure: Check if struct fsxattr is available from linux header

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Fixes build failure with --enable-xfsctl and
new linux headers (>=4.5) and older xfsprogs(<4.5):
In file included from /usr/include/xfs/xfs.h:38:0,
                 from /var/tmp/portage/app-emulation/qemu-2.5.0-r1/work/qemu-2.5.0/block/raw-posix.c:97:
/usr/include/xfs/xfs_fs.h:42:8: error: redefinition of ‘struct fsxattr’
 struct fsxattr {
        ^
In file included from /var/tmp/portage/app-emulation/qemu-2.5.0-r1/work/qemu-2.5.0/block/raw-posix.c:60:0:
/usr/include/linux/fs.h:155:8: note: originally defined here
 struct fsxattr {

This is really a bug in the system headers, but we can work around it
by defining HAVE_FSXATTR in the QEMU headers if linux/fs.h provides
the struct, so that xfs_fs.h doesn't try to define it as well.

CC: qemu-trivial@nongnu.org
CC: Markus Armbruster <armbru@redhat.com>
CC: Peter Maydell <peter.maydell@linaro.org>
CC: Stefan Weil <sw@weilnetz.de>
Tested-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Jan Vesely <jano.vesely@gmail.com>
[PMM: adjusted commit message, comments]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Jan Vesely 2016-04-29 13:15:23 -04:00 committed by Peter Maydell
parent 20b0f5fef6
commit 277abf15a6
1 changed files with 23 additions and 0 deletions
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23
configure vendored
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@ -4493,6 +4493,21 @@ if test "$fortify_source" != "no"; then
fi
fi
##########################################
# check if struct fsxattr is available via linux/fs.h
have_fsxattr=no
cat > $TMPC << EOF
#include <linux/fs.h>
struct fsxattr foo;
int main(void) {
return 0;
}
EOF
if compile_prog "" "" ; then
have_fsxattr=yes
fi
##########################################
# End of CC checks
# After here, no more $cc or $ld runs
@ -5160,6 +5175,14 @@ fi
if test "$have_ifaddrs_h" = "yes" ; then
echo "HAVE_IFADDRS_H=y" >> $config_host_mak
fi
# Work around a system header bug with some kernel/XFS header
# versions where they both try to define 'struct fsxattr':
# xfs headers will not try to redefine structs from linux headers
# if this macro is set.
if test "$have_fsxattr" = "yes" ; then
echo "HAVE_FSXATTR=y" >> $config_host_mak
fi
if test "$vte" = "yes" ; then
echo "CONFIG_VTE=y" >> $config_host_mak
echo "VTE_CFLAGS=$vte_cflags" >> $config_host_mak