The Full Debug Symbols (FDS) feature is disabled for Java on
Solaris X64 by the following code:

make/solaris/makefiles/defs.make:

   129 ifeq ($(ENABLE_FULL_DEBUG_SYMBOLS),1)
   130 # Default OBJCOPY comes from the SUNWbinutils package:
   131 DEF_OBJCOPY=/usr/sfw/bin/gobjcopy
   132 ifeq ($(VM_PLATFORM),solaris_amd64)
   133 # On Solaris AMD64/X64, gobjcopy is not happy and fails:
   134 #
   135 # usr/sfw/bin/gobjcopy --add-gnu-debuglink=<lib>.debuginfo <lib>.s
o
   136 # BFD: stKPaiop: Not enough room for program headers, try linking
with -N
   137 # /usr/sfw/bin/gobjcopy: stKPaiop: Bad value
   138 # BFD: stKPaiop: Not enough room for program headers, try linking
with -N
   139 # /usr/sfw/bin/gobjcopy: libsaproc.debuginfo: Bad value
   140 # BFD: stKPaiop: Not enough room for program headers, try linking
with -N
   141 # /usr/sfw/bin/gobjcopy: stKPaiop: Bad value
   142 _JUNK_ := $(shell \
   143 echo >&2 "INFO: $(DEF_OBJCOPY) is not working on Solaris AMD64/X
64")
   144 OBJCOPY=
   145 else
   146 OBJCOPY=$(shell test -x $(DEF_OBJCOPY) && echo $(DEF_OBJCOPY))
   147 ifneq ($(ALT_OBJCOPY),)
   148 _JUNK_ := $(shell echo >&2 "INFO: ALT_OBJCOPY=$(ALT_OBJCOPY)")
   149 OBJCOPY=$(shell test -x $(ALT_OBJCOPY) && echo $(ALT_OBJCOPY))
   150 endif
   151 endif


Once a Solaris 10 patch for the following bug is available:

    7165593 2/3 gobjcopy fails with 64-bit libjvm.so on Solaris X64

then the FDS feature can be enabled on Solaris X64 and further
testing can be done.