creating _libxl_list.h is racy

[Olaf Hering <olaf@aepfle.de>]

There is apparently a race in creating _libxl_list.h,
in xen-unstable 25821:19d367bf07b7:


[  261s] + make -j8 -k docs stubdom
 ...
[  379s] make -C libxl install
[  379s] make[3]: Entering directory `/usr/src/packages/BUILD/xen-4.2.25821/non-dbg/tools/libxl'
[  379s] /usr/bin/perl /usr/src/packages/BUILD/xen-4.2.25821/non-dbg/tools/libxl/../../tools/include/xen-external/bsd-sys-queue-h-seddery /usr/src/packages/BUILD/xen-4.2.25821/non-dbg/tools/libxl/../../tools/include/xen-external/bsd-sys-queue.h --prefix=libxl >_libxl_list.h.new
[  380s] rm -f _paths.h.tmp.tmp;  echo "SBINDIR=\"/usr/sbin\"" >>_paths.h.tmp.tmp;  echo "BINDIR=\"/usr/bin\"" >>_paths.h.tmp.tmp;  echo "LIBEXEC=\"/usr/lib/xen/bin\"" >>_paths.h.tmp.tmp;  echo "LIBDIR=\"/usr/lib64\"" >>_paths.h.tmp.tmp;  echo "SHAREDIR=\"/usr/share\"" >>_paths.h.tmp.tmp;  echo "PRIVATE_BINDIR=\"/usr/lib64/xen/bin\"" >>_paths.h.tmp.tmp;  echo "XENFIRMWAREDIR=\"/usr/lib/xen/boot\"" >>_paths.h.tmp.tmp;  echo "XEN_CONFIG_DIR=\"/etc/xen\"" >>_paths.h.tmp.tmp;  echo "XEN_SCRIPT_DIR=\"/etc/xen/scripts\"" >>_paths.h.tmp.tmp;  echo "XEN_LOCK_DIR=\"/var/lock\"" >>_paths.h.tmp.tmp;  echo "XEN_RUN_DIR=\"/var/run/xen\"" >>_paths.h.tmp.tmp;  echo "XEN_PAGING_DIR=\"/var/lib/xen/xenpaging\"" >>_paths.h.tmp.tmp; if ! cmp -s _paths.h.tmp.tmp _paths.h.tmp; then mv -f _paths.h.tmp.tmp _paths
 .h.tmp; else rm -f _paths.h.tmp.tmp; fi
[  380s] /usr/bin/perl -w libxl_save_msgs_gen.pl _libxl_save_msgs_callout.h >_libxl_save_msgs_callout.h.new
[  380s] /usr/bin/perl -w libxl_save_msgs_gen.pl _libxl_save_msgs_helper.h >_libxl_save_msgs_helper.h.new
[  380s] python gentypes.py libxl_types.idl __libxl_types.h __libxl_types_json.h __libxl_types.c
[  380s] python gentypes.py libxl_types_internal.idl __libxl_types_internal.h __libxl_types_internal_json.h __libxl_types_internal.c
[  380s] /usr/bin/perl -w libxl_save_msgs_gen.pl _libxl_save_msgs_callout.c >_libxl_save_msgs_callout.c.new
[  380s] Parsing libxl_types.idl
[  380s] if ! cmp -s _libxl_save_msgs_callout.h.new _libxl_save_msgs_callout.h; then mv -f _libxl_save_msgs_callout.h.new _libxl_save_msgs_callout.h; else rm -f _libxl_save_msgs_callout.h.new; fi
[  380s] /usr/bin/perl -w libxl_save_msgs_gen.pl _libxl_save_msgs_helper.c >_libxl_save_msgs_helper.c.new
[  380s] Parsing libxl_types_internal.idl
[  380s] if ! cmp -s _libxl_save_msgs_helper.h.new _libxl_save_msgs_helper.h; then mv -f _libxl_save_msgs_helper.h.new _libxl_save_msgs_helper.h; else rm -f _libxl_save_msgs_helper.h.new; fi
[  380s] outputting libxl type definitions to __libxl_types_internal.h
[  380s] outputting libxl JSON definitions to __libxl_types_internal_json.h
[  380s] outputting libxl type implementations to __libxl_types_internal.c
[  380s] if ! cmp -s __libxl_types_internal.h _libxl_types_internal.h; then mv -f __libxl_types_internal.h _libxl_types_internal.h; else rm -f __libxl_types_internal.h; fi
[  380s] sed -e "s/\([^=]*\)=\(.*\)/#define \1 \2/g" _paths.h.tmp >_paths.h.2.tmp
[  380s] if ! cmp -s __libxl_types_internal_json.h _libxl_types_internal_json.h; then mv -f __libxl_types_internal_json.h _libxl_types_internal_json.h; else rm -f __libxl_types_internal_json.h; fi
[  380s] rm -f _paths.h.tmp
[  380s] if ! cmp -s _paths.h.2.tmp _paths.h; then mv -f _paths.h.2.tmp _paths.h; else rm -f _paths.h.2.tmp; fi
[  380s] if ! cmp -s __libxl_types_internal.c _libxl_types_internal.c; then mv -f __libxl_types_internal.c _libxl_types_internal.c; else rm -f __libxl_types_internal.c; fi
[  380s] outputting libxl type definitions to __libxl_types.h
[  380s] outputting libxl JSON definitions to __libxl_types_json.h
[  380s] outputting libxl type implementations to __libxl_types.c
[  380s] if ! cmp -s __libxl_types.h _libxl_types.h; then mv -f __libxl_types.h _libxl_types.h; else rm -f __libxl_types.h; fi
[  380s] if ! cmp -s __libxl_types_json.h _libxl_types_json.h; then mv -f __libxl_types_json.h _libxl_types_json.h; else rm -f __libxl_types_json.h; fi
[  380s] if ! cmp -s __libxl_types.c _libxl_types.c; then mv -f __libxl_types.c _libxl_types.c; else rm -f __libxl_types.c; fi
[  380s] gcc  -O1 -fno-omit-frame-pointer -m64 -g -fno-strict-aliasing -std=gnu99 -Wall -Wstrict-prototypes -Wdeclaration-after-statement   -D__XEN_TOOLS__ -MMD -MF ._libxl.api-for-check.d  -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -fno-optimize-sibling-calls -fmessage-length=0 -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector -funwind-tables -fasynchronous-unwind-tables -Werror -Wno-format-zero-length -Wmissing-declarations -Wno-declaration-after-statement -Wformat-nonliteral -I. -fPIC -pthread -I/usr/src/packages/BUILD/xen-4.2.25821/non-dbg/tools/libxl/../../tools/libxc -I/usr/src/packages/BUILD/xen-4.2.25821/non-dbg/tools/libxl/../../tools/include  -I/usr/src/packages/BUILD/xen-4.2.25821/non-dbg/tools/libxl/../../tools/libxl -I/usr/src/packages/BUILD/xen-4.2.25821/non-dbg/tools/libxl/../.
 ./tools/libxc -I/usr/src/packages/BUILD/xen-4.2.25821/non-dbg/tools/libxl/../../tools/include -I/usr/src/packages/BUILD/xen-4.2.25821/non-dbg/tools/libxl/../../tools/include -include /usr/src/packages/BUILD/xen-4.2.25821/non-dbg/tools/libxl/../../tools/config.h  -I/usr/src/packages/BUILD/xen-4.2.25821/non-dbg/tools/libxl/../../tools/libxc -I/usr/src/packages/BUILD/xen-4.2.25821/non-dbg/tools/libxl/../../tools/include   -c -E libxl.h  \
[  380s] -DLIBXL_EXTERNAL_CALLERS_ONLY=LIBXL_EXTERNAL_CALLERS_ONLY \
[  380s] >_libxl.api-for-check.new
[  380s] if ! cmp -s _libxl_save_msgs_callout.c.new _libxl_save_msgs_callout.c; then mv -f _libxl_save_msgs_callout.c.new _libxl_save_msgs_callout.c; else rm -f _libxl_save_msgs_callout.c.new; fi
[  380s] if ! cmp -s _libxl_save_msgs_helper.c.new _libxl_save_msgs_helper.c; then mv -f _libxl_save_msgs_helper.c.new _libxl_save_msgs_helper.c; else rm -f _libxl_save_msgs_helper.c.new; fi
[  380s] libxl.h:260:25: fatal error: _libxl_list.h: No such file or directory
[  380s] compilation terminated.
[  380s] make[3]: *** [_libxl.api-for-check] Error 1
[  381s] if ! cmp -s _libxl_list.h.new _libxl_list.h; then mv -f _libxl_list.h.new _libxl_list.h; else rm -f _libxl_list.h.new; fi
[  381s] make[3]: Target `install' not remade because of errors.
[  381s] make[3]: Leaving directory `/usr/src/packages/BUILD/xen-4.2.25821/non-dbg/tools/libxl'
[  381s] make[2]: *** [subdir-install-libxl] Error 2
[  381s] make[2]: Leaving directory `/usr/src/packages/BUILD/xen-4.2.25821/non-dbg/tools'
[  381s] make[1]: *** [subdirs-install] Error 2
[  381s] make[1]: Target `install' not remade because of errors.
[  381s] make[1]: Leaving directory `/usr/src/packages/BUILD/xen-4.2.25821/non-dbg/tools'
[  381s] make: *** [install-tools] Error 2
[  381s] make: Target `stubdom' not remade because of errors.
[  381s] error: Bad exit status from /var/tmp/rpm-tmp.TNgYuT (%build)