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>
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@ -2812,7 +2812,11 @@ fi
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open_by_hande_at=no
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open_by_hande_at=no
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cat > $TMPC << EOF
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cat > $TMPC << EOF
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#include <fcntl.h>
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#include <fcntl.h>
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#if !defined(AT_EMPTY_PATH)
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# error missing definition
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#else
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int main(void) { struct file_handle fh; return open_by_handle_at(0, &fh, 0); }
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int main(void) { struct file_handle fh; return open_by_handle_at(0, &fh, 0); }
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#endif
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EOF
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EOF
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if compile_prog "" "" ; then
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if compile_prog "" "" ; then
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open_by_handle_at=yes
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open_by_handle_at=yes
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