[Qemu-devel] [Bug 1324112] Re: qemu parallel building error on libcacard.la

[Fam Zheng]

Could be because of this rule:

> # libtool will build the .o files, too
> $(libcacard-obj-y): | $(libcacard-lobj-y)

Does removing the "|" (order deps) solve the issue?

Fam

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https://bugs.launchpad.net/bugs/1324112

Title:
  qemu parallel building error on libcacard.la

Status in QEMU:
  New

Bug description:
  hi,

  im building qemu with a large make -j value(9).
  sometimes the build fails because of an error:
  libtool: link: ar cru .libs/libcacard.a  stubs/arch-query-cpu-def.o 
stubs/clock-warp.o stubs/cpu-get-clock.o stubs/cpu-get-icount.o stubs/dump.o 
stubs/fdset-add-fd.o stubs/fdset-find-fd.o stubs/fdset-get-fd.o 
stubs/fdset-remove-fd.o stubs/gdbstub.o stubs/get-fd.o stubs/get-vm-name.o 
stubs/iothread-lock.o stubs/migr-blocker.o stubs/mon-is-qmp.o 
stubs/mon-printf.o stubs/mon-print-filename.o stubs/mon-protocol-event.o 
stubs/mon-set-error.o stubs/pci-drive-hot-add.o stubs/qtest.o stubs/reset.o 
stubs/runstate-check.o stubs/set-fd-handler.o stubs/slirp.o stubs/sysbus.o 
stubs/uuid.o stubs/vm-stop.o stubs/vmstate.o stubs/cpus.o stubs/kvm.o 
libcacard/cac.o libcacard/event.o libcacard/vcard.o libcacard/vreader.o 
libcacard/vcard_emul_nss.o libcacard/vcard_emul_type.o libcacard/card_7816.o 
libcacard/vcardt.o util/osdep.o util/cutils.o util/qemu-timer-common.o 
util/error.o util/qemu-error.o util/oslib-posix.o util/qemu-thread-posix.o 
trace/generated-events.o trace/default.o trace/control.o 
trace/generated-tracers.o
  ar: trace/generated-events.o: No such file or directory
  make[2]: *** [libcacard.la] Error 1

  
  i see the build of generated-events.o in the log  before the ar command.
  because of the -j it was probably not completed yet.
  the generated-events.o build command:
  /usr/bin/gcc -I/home/npsdb/qemu/qemu/tcg -I/home/npsdb/qemu/qemu/tcg/i386 
-I/home/npsdb/qemu/qemu/linux-headers 
-I/home/npsdb/qemu/build/linux_x86_64/linux-headers -I. -I/home/npsdb/qemu/qemu 
-I/home/npsdb/jenkins/qemu/qemu/include -I/home/npsdb/qemu/qemu/libcacard 
-Itrace -Itrace -fPIE -DPIE -m64 -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 
-D_LARGEFILE_SOURCE -Wstrict-prototypes -Wredundant-decls -Wall -Wundef 
-Wwrite-strings -Wmissing-prototypes -fno-strict-aliasing -fno-common  
-Wendif-labels -Wmissing-include-dirs -Wempty-body -Wnested-externs 
-Wformat-security -Wformat-y2k -Winit-self -Wignored-qualifiers 
-Wold-style-declaration -Wold-style-definition -Wtype-limits 
-fstack-protector-all     -I/usr/include/libpng12   -I/usr/include/nss3 
-I/usr/include/nspr4   -pthread -I/usr/include/glib-2.0 
-I/usr/lib64/glib-2.0/include   -I/usr/include/pixman-1    
-I/home/npsdb/qemu/qemu/tests -I qga/qapi-generated -MMD -MP -MT 
trace/generated-events.o -MF trace/generated-events.d -O2 -U_FORTIFY_SOURCE 
-D_FORTIFY_SOURCE=2 -pthread -I/usr/include/glib-2.0 
-I/usr/lib64/glib-2.0/include   -g   -c -o trace/generated-events.o 
trace/generated-events.c

  
  must be a race condition in the makefile because of a missing dependency.
  i tried to find it but it was a little bit complicated to me.

  thanks,
  tal

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