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configure: Fix build for some versions of glibc (9pfs) 

Some versions declare open_by_handle_at, but don't define AT_EMPTY_PATH.
Extend the check in configure to test both preconditions.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Serge Hallyn <serge.hallyn@ubuntu.com>
(cherry picked from commit acc55ba8b1)

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
This commit is contained in:
Stefan Weil 2012-06-06 19:35:57 +00:00 committed by Michael Roth
parent c49dd1bf64
commit f6db26e4f8
1 changed files with 4 additions and 0 deletions
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4
configure vendored
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@ -2811,7 +2811,11 @@ fi
open_by_hande_at=no open_by_hande_at=no
cat > $TMPC << EOF cat > $TMPC << EOF
#include <fcntl.h> #include <fcntl.h>
#if !defined(AT_EMPTY_PATH)
# error missing definition
#else
int main(void) { struct file_handle fh; return open_by_handle_at(0, &fh, 0); } int main(void) { struct file_handle fh; return open_by_handle_at(0, &fh, 0); }
#endif
EOF EOF
if compile_prog "" "" ; then if compile_prog "" "" ; then
open_by_handle_at=yes open_by_handle_at=yes