Add further -no-pie checks to Rumprun build tools

This builds upon the previous commit to add -no-pie anywhere the
relocatable flag (-Wl,-r) is used to handle compilers that enable -pie
by default (Such as Debian Stretch).

app-tools/cc.in

@@ -89,14 +89,18 @@ compile)
 	;;
 ferment)
 	meta1="$(${PRMETA} "${OUTFILE}" 2>/dev/null)"
+	nopieoption=
+	if [ -z "`echo 'int p=1;' | ${CC} -no-pie -S -o /dev/null -x c - 2>&1`" ]; then
+		nopieoption=-no-pie
+	fi
 
 	# Link the real (from user's PoV) output file as a relocatable object,
 	# with no rump components. '-u main' is necessary to pull in main if the
 	# user is linking it in from a library.
 	${CC} ${CFLAGS} -no-integrated-cpp \
 	    --sysroot !DESTDIR!/rumprun-!MACHINE_GNU_ARCH! \
 	    -specs=!DESTDIR!/rumprun-!MACHINE_GNU_ARCH!/lib/specs-compile_or_ferment \
-	    -Wl,-r -Wl,-u,main \
+	    ${nopieoption} -Wl,-r -Wl,-u,main \
 	    "$@" !DESTDIR!/rumprun-!MACHINE_GNU_ARCH!/share/!TOOLTUPLE!-recipe.s ${EXTRALIBS} || die
 
 	# If the presumed output file did not change, and the compiler

app-tools/cookfs.in

@@ -155,6 +155,11 @@ setfilevars ()
 	rf=_rumpfs_f${fn}
 }
 
+nopieoption=
+if [ -z "`echo 'int p=1;' | ${RUMPRUN_COOKFS_CC} -no-pie -S -o /dev/null -x c - 2>&1`" ]; then
+	nopieoption=-no-pie
+fi
+
 processonefile ()
 {
 
@@ -164,7 +169,7 @@ processonefile ()
 	ln -sf -- "${fabs}" ${LINKPATH}
 
 	${RUMPRUN_COOKFS_CC} !CFLAGS! !CPPFLAGS! -nostdlib		\
-	    -Wl,-r,-b,binary -o ${TMPDIR}/d${fn}.o ${LINKPATH}
+	    ${nopieoption} -Wl,-r,-b,binary -o ${TMPDIR}/d${fn}.o ${LINKPATH}
 
 	${RUMPRUN_COOKFS_OBJCOPY}					\
 	    --redefine-sym ${LINKPATH_BIN}_start=${rf}_start		\
@@ -233,7 +238,7 @@ exec 1>&3 3>&-
 unset IFS
 
 ${RUMPRUN_COOKFS_CC} !CFLAGS! !CPPFLAGS! -I${RUMPRUN_COOKFS_INCDIR}	\
-    -nostdlib -Wl,-r -o ${TMPDIR}/fin.o ${TMPDIR}/d*.o ${TMPDIR}/constr.c
+    -nostdlib ${nopieoption} -Wl,-r -o ${TMPDIR}/fin.o ${TMPDIR}/d*.o ${TMPDIR}/constr.c
 ${RUMPRUN_COOKFS_OBJCOPY} ${LSYM} ${TMPDIR}/fin.o ${OUTFILE}
 
 totsize=$(${RUMPRUN_COOKFS_SIZE} ${OUTFILE} | awk 'NR == 2{print $4}')

app-tools/rumprun-bake.in

@@ -397,8 +397,13 @@ done
 
 MACHINE_GNU_ARCH=${RUMPBAKE_TUPLE%%-*}
 
+nopieoption=
+if [ -z "`echo 'int p=1;' | ${RUMPBAKE_BACKINGCC} -no-pie -S -o /dev/null -x c - 2>&1`" ]; then
+	nopieoption=-no-pie
+fi
+
 # Final link using cc to produce the unikernel image.
-${runcmd} ${RUMPBAKE_BACKINGCC} ${RUMPBAKE_CFLAGS}			\
+${runcmd} ${RUMPBAKE_BACKINGCC} ${RUMPBAKE_CFLAGS} ${nopieoption}	\
     --sysroot ${RUMPBAKE_TOOLDIR}/rumprun-${MACHINE_GNU_ARCH}		\
     -specs=${RUMPBAKE_TOOLDIR}/rumprun-${MACHINE_GNU_ARCH}/lib/rumprun-${PLATFORM}/specs-bake \
     -o ${OUTPUT} ${allobjs}						\