During an exp-run for llvm 14 (see bug 261742), it turned out that
java/openjdk13 and java/openjdk17 fail to build with clang 14 (but this
also affects openjdk14 through 16):
=== Output from failing command(s) repeated here ===
* For target hotspot_variant-server_libjvm_objs_serviceThread.o:
/wrkdirs/usr/ports/java/openjdk13/work/jdk13u-jdk-13.0.10-5-1/src/hotspot/share/runtime/serviceThread.cpp:133:15: error: use of bitwise '|' with boolean operands [-Werror,-Wbitwise-instead-of-logical]
while (((sensors_changed = LowMemoryDetector::has_pending_requests()) |
~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/wrkdirs/usr/ports/java/openjdk13/work/jdk13u-jdk-13.0.10-5-1/src/hotspot/share/runtime/serviceThread.cpp:133:15: note: cast one or both operands to int to silence this warning
/wrkdirs/usr/ports/java/openjdk13/work/jdk13u-jdk-13.0.10-5-1/src/hotspot/share/runtime/serviceThread.cpp:133:15: error: use of bitwise '|' with boolean operands [-Werror,-Wbitwise-instead-of-logical]
while (((sensors_changed = LowMemoryDetector::has_pending_requests()) |
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/wrkdirs/usr/ports/java/openjdk13/work/jdk13u-jdk-13.0.10-5-1/src/hotspot/share/runtime/serviceThread.cpp:133:15: note: cast one or both operands to int to silence this warning
/wrkdirs/usr/ports/java/openjdk13/work/jdk13u-jdk-13.0.10-5-1/src/hotspot/share/runtime/serviceThread.cpp:133:15: error: use of bitwise '|' with boolean operands [-Werror,-Wbitwise-instead-of-logical]
while (((sensors_changed = LowMemoryDetector::has_pending_requests()) |
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/wrkdirs/usr/ports/java/openjdk13/work/jdk13u-jdk-13.0.10-5-1/src/hotspot/share/runtime/serviceThread.cpp:133:15: note: cast one or both operands to int to silence this warning
/wrkdirs/usr/ports/java/openjdk13/work/jdk13u-jdk-13.0.10-5-1/src/hotspot/share/runtime/serviceThread.cpp:133:15: error: use of bitwise '|' with boolean operands [-Werror,-Wbitwise-instead-of-logical]
while (((sensors_changed = LowMemoryDetector::has_pending_requests()) |
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
... (rest of output omitted)
Although the warning is normally an indication of a potential problem,
in this case a comment just before the affected code explictly mentions
the reason for using bitwise '|' instead of logical '||':
// Process all available work on each (outer) iteration, rather than
// only the first recognized bit of work, to avoid frequently true early
// tests from potentially starving later work. Hence the use of
// arithmetic-or to combine results; we don't want short-circuiting.
(See
<https://github.com/openjdk/jdk/blob/master/src/hotspot/share/runtime/serviceThread.cpp#L140>)
Therefore, we should suppress -Wbitwise-instead-of-logical for clang 14
and higher.
PR: 262845
Approved by: portmgr (build fix blanket)
MFH: 2022Q2
e406118f77