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+device: 0.816
+semantic: 0.785
+instruction: 0.772
+other: 0.731
+graphic: 0.697
+boot: 0.638
+network: 0.615
+socket: 0.601
+vnc: 0.545
+KVM: 0.462
+mistranslation: 0.440
+assembly: 0.134
+
+qemu-user warnings confuse userland applications
+
+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.
+
+Yes, we should probably move these "unimplemented syscall" warnings to the LOG_UNIMP logging level (which you can then turn on if you want them).
+
+
+Patch has been merged here:
+https://git.qemu.org/?p=qemu.git;a=commitdiff;h=122f9c83f2ef1cd90152
+