Dmitry Samersoff <dmitry.samersoff@oracle.com> discovered that LOG=trace only works if bash is in /bin. He also suggested the following patch:

diff -r 22c6f0b7e2b5 common/makefiles/MakeBase.gmk
--- a/common/makefiles/MakeBase.gmk Tue Oct 15 08:24:31 2013 -0700
+++ b/common/makefiles/MakeBase.gmk Tue Oct 29 17:15:09 2013 +0400
@@ -336,7 +336,7 @@
         # (and causing a crash on Cygwin).
         # Default shell seems to always be /bin/sh. Must override with bash to get this to work on Solaris.
         # Only use time if it's GNU time which supports format and output file.
- WRAPPER_SHELL:=/bin/bash $$(SRC_ROOT)/common/bin/shell-tracer.sh $$(if $$(findstring yes,$$(IS_GNU_TIME)),$$(TIME),-) $$(OUTPUT_ROOT)/build-trace-time.log /bin/bash
+ WRAPPER_SHELL:=$(BASH) $$(SRC_ROOT)/common/bin/shell-tracer.sh $$(if $$(findstring yes,$$(IS_GNU_TIME)),$$(TIME),-) $$(OUTPUT_ROOT)/build-trace-time.log $(BASH)
         SHELL=$$(warning $$(if $$@,Building $$@,Running shell command) $$(if $$<, (from $$<))$$(if $$?, ($$(wordlist 1, 20, $$?) $$(if $$(wordlist 21, 22, $$?), ... [in total $$(words $$?) files]) newer)))$$(WRAPPER_SHELL)
     endif
     # Never remove warning messages; this is just for completeness