Solaris JDK build: C compiler writing tmp files into the "make" tree

Whilst building on Solaris 11 x86, when the source tree was not writeable
by the user building the sources, I found two locations where the build failed.
In each case it was apparently because the build needed to place temp files
in the current directory, which was in the make subtree.
The locations are unrelated, one being in nio, the other awt and
its not clear without at least some more investigation whether this is a failure
to set a WD as elsewhere, or we are encountering a compiler bug.
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/java/devtools/i586/SUNWspro/SS12u1/bin/cc -DNDEBUG -DTRIMMED -D__solaris__ -Di586 -DcpuIntel -D_LITTLE_ENDIAN= -Di386 -DTRACING -DMACRO_MEMSYS_OPS -DBREAKPTS -I. -I/home/user2/jdk8bld/tmp/java/java.nio/nio/CClassHeaders -I../../../src/solaris/javavm/export -I../../../src/share/javavm/export -I../../../src/share/native/sun/nio/ch -I../../../src/share/native/java/io -I../../../src/share/native/java/net -I../../../src/solaris/native/java/net -I/home/user2/jdk8bld/tmp/java/java.nio/nio/CClassHeaders/../../../java.lang/java/CClassHeaders -I../../../src/share/native/common -I../../../src/solaris/native/common -I../../../src/share/native/java/nio -I../../../src/solaris/native/java/nio -o /home/user2/jdk8bld/tmp/java/java.nio/nio/genSolarisConstants ../../../src/solaris/native/sun/nio/fs/genSolarisConstants.c
Assembler: genSolarisConstants.c
        "/tmp/yabeAAAIcaW9q", line 246 : Cannot open output file: "genSolarisConstants.o"
Failure in /java/devtools/i386/SUNWspro/SS12u1/prod/bin/fbe, status = 0x7f00
Fatal Error exec'ing /java/devtools/i386/SUNWspro/SS12u1/prod/bin/fbe
cc: acomp failed for ../../../src/solaris/native/sun/nio/fs/genSolarisConstants.c
make381[3]: *** [/home/user2/jdk8bld/tmp/java/java.nio/nio/genSolarisConstants] Error 1
make381[3]: Leaving directory `/net/foo/user1/jdk8/jdk/make/java/nio'
make381[2]: *** [niosrc] Error 2
make381[2]: Leaving directory `/net/foo/user1/jdk8/jdk/make/java/java'
make381[1]: *** [all] Error 1
make381[1]: Leaving directory `/net/foo/user1/jdk8/jdk/make/java'
make381: *** [all] Error 1
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/java/devtools/i586/SUNWspro/SS12u1/bin/cc -xO2 -Wu,-O2~yz -xregs=no%frameptr -L/home/user2/jdk8bld/tmp/sun/sun.awt.X11/xawt/obj -xc99=%none -xCC -errshort=tags -Xa -v -mt -xstrconst -W0,-noglobal -m32 -erroff=E_BAD_PRAGMA_PACK_VALUE -KPIC -DNDEBUG -DTRIMMED -D__solaris__ -Di586 -DcpuIntel -D_LITTLE_ENDIAN= -Di386 -DTRACING -DMACRO_MEMSYS_OPS -DBREAKPTS -I. -I/home/user2/jdk8bld/tmp/sun/sun.awt.X11/xawt/CClassHeaders -I../../../src/solaris/javavm/export -I../../../src/share/javavm/export -I../../../src/share/native/common -I../../../src/solaris/native/common -I../../../src/share/native/sun/awt/X11 -I../../../src/solaris/native/sun/awt/X11 -DFUNCPROTO=15 -I/java/devtools/share/cups/include -DXAWT -DXAWT_HACK -I/home/user2/jdk8bld/tmp/sun/sun.awt.X11/xawt/../../sun.awt/awt/CClassHeaders -I../../../src/solaris/native/sun/awt -I../../../src/solaris/native/sun/xawt -I../../../src/solaris/native/sun/jdga -I../../../src/share/native/sun/awt/debug -I../../../src/share/native/sun/awt/image/cvutils -I../../../src/share/native/sun/java2d -I../../../src/share/native/sun/java2d/loops -I../../../src/share/native/sun/awt/image/cvutils -I../../../src/share/native/sun/awt/image -I../../../src/share/native/sun/font -I../../../src/solaris/native/sun/java2d -I../../../src/share/native/sun/java2d/pipe -I../../../src/share/native/sun/java2d/opengl -I../../../src/solaris/native/sun/java2d/opengl -I../../../src/solaris/native/sun/java2d/x11 -I../../../src/share/native/sun/dc/path -I../../../src/share/native/sun/dc/doe -I../../../src/share/native/sun/awt/alphacomposite -I../../../src/share/native/sun/awt/medialib -I../../../src/solaris/native/sun/awt/medialib -I../../../src/solaris/native/sun/font -I../../../src/share/native/sun/awt -I../../../src/solaris/native/sun/awt -I/usr/openwin/include/X11/extensions -DINTERNAL_BUILD -o /home/user2/jdk8bld/gensrc/sun/awt/X11/generator/sizer.32 /home/user2/jdk8bld/gensrc/sun/awt/X11/generator/sizer.32.c
Assembler: sizer.32.c
        "/tmp/ube.1312972884.25091.05.s", line 14912 : Cannot open output file: "sizer.32.o"
cc: fbe failed for /home/user2/jdk8bld/gensrc/sun/awt/X11/generator/sizer.32.c
make381[2]: *** [/home/user2/jdk8bld/gensrc/sun/awt/X11/generator/sizer.32] Error 1
make381[2]: Leaving directory `/net/foo/user1/jdk8/jdk/make/sun/xawt'
make381[1]: *** [all] Error 1
make381[1]: Leaving directory `/net/foo/user1/jdk8/jdk/make/sun'
make381: *** [all] Error 1