[Qemu-devel] [Bug 1777226] [NEW] qemu-user warnings confuse userland applications

[John Paul Adrian Glaubitz]

Public bug reported:

I recently observed that warning messages emitted by qemu-user can
confuse applications when reading from stdout/stderr. This was observed
with the configure script of OpenJDK-11 on qemu-sh4:

configure: Found potential Boot JDK using configure arguments
configure: Potential Boot JDK found at /usr/lib/jvm/java-10-openjdk-sh4 is 
incorrect JDK version (qemu: Unsupported syscall: 318); ignoring
configure: (Your Boot JDK version must be one of: 10 11)
configure: error: The path given by --with-boot-jdk does not contain a valid 
Boot JDK
configure exiting with result code 1

See:
https://buildd.debian.org/status/fetch.php?pkg=openjdk-11&arch=sh4&ver=11%7E18-1&stamp=1529119043&raw=0

Commenting out the line of code which emits the warning fixes the
problem for me and the configure script finishes without problems.

Thus, qemu should be modified to avoid cluttering stdout or stderr with
its own messages and rather send those warnings to a log file or
similar.

** Affects: qemu
     Importance: Undecided
         Status: New

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1777226

Title:
  qemu-user warnings confuse userland applications

Status in QEMU:
  New

Bug description:
  I recently observed that warning messages emitted by qemu-user can
  confuse applications when reading from stdout/stderr. This was
  observed with the configure script of OpenJDK-11 on qemu-sh4:

  configure: Found potential Boot JDK using configure arguments
  configure: Potential Boot JDK found at /usr/lib/jvm/java-10-openjdk-sh4 is 
incorrect JDK version (qemu: Unsupported syscall: 318); ignoring
  configure: (Your Boot JDK version must be one of: 10 11)
  configure: error: The path given by --with-boot-jdk does not contain a valid 
Boot JDK
  configure exiting with result code 1

  See:
  
https://buildd.debian.org/status/fetch.php?pkg=openjdk-11&arch=sh4&ver=11%7E18-1&stamp=1529119043&raw=0

  Commenting out the line of code which emits the warning fixes the
  problem for me and the configure script finishes without problems.

  Thus, qemu should be modified to avoid cluttering stdout or stderr
  with its own messages and rather send those warnings to a log file or
  similar.

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1777226/+subscriptions