Part of the shared lib build rework.

extra/scripts/get-needed-libgcc-objects.sh

@@ -17,9 +17,9 @@ LIBGCC=`$CC -print-libgcc-file-name`
 echo Finding missing symbols in libc.a ...
 echo "    partial linking..."
 rm -f libc.ldr
-ld -r -o libc.ldr ../crt0.o *.o
+ld -r -o libc.ldr ../crt0.o --whole-archive ../libc.a
 
-if nm -s libc.ldr | grep -v " main$" | grep " U " > sym.need ; then
+if nm --undefined-only libc.ldr | grep -v "^main$" > sym.need ; then
     rm -f obj.need
     touch obj.need
     for SYM in `cat sym.need | sed -e 's/ U //g'` ; do
@@ -37,7 +37,7 @@ fi
 rm -rf tmp-gcc
 mkdir tmp-gcc
 (cd tmp-gcc ; ar -x $LIBGCC)
-rm libgcc.ldr
+rm -f libgcc.ldr
 
 echo Extracting referenced libgcc.a objects ...
 
@@ -46,7 +46,7 @@ touch obj.need.0
 while [ -s obj.need ] && ! cmp -s obj.need obj.need.0 ; do
     (cd tmp-gcc ; cat ../obj.need | xargs ld -r -o ../libgcc.ldr)
     cp obj.need obj.need.0
-    if nm -s libgcc.ldr | grep " U " > sym.need ; then
+    if nm --undefined-only libgcc.ldr > sym.need ; then
 	for SYM in `cat sym.need | sed -e 's/ U //g'` ; do
 	    if nm -s $LIBGCC | grep -q $SYM" in " ; then
 		nm -s $LIBGCC | grep $SYM" in " | cut -d' ' -f3 >> obj.need
@@ -58,8 +58,13 @@ done
 cat obj.need | sort | uniq > obj.need.0
 (cd tmp-gcc ; cp `cat ../obj.need` ..)
 
-echo Objects added from $LIBGCC:
-cat obj.need.0
+if [ -s obj.need.0 ] ; then
+    echo Objects added from $LIBGCC:
+    cat obj.need.0
+    (cd tmp-gcc ; cat ../obj.need | xargs ar r ../libgcc-need.a)
+else
+    echo No objects added from $LIBGCC.
+fi
 
 if [ -s sym.need ] ; then
     echo Symbols missing from libgcc.a: