Pass nm and objcopy as optional environment variables to build_wrapper

cmake/build_wrapper.sh

@@ -1,6 +1,10 @@
 #!/bin/sh -e
 # This is used for renaming symbols for the fat runtime, don't call directly
 # TODO: make this a lot less fragile!
+
+NM=${NM_PATH:-nm}
+OBJCOPY=${OBJCOPY_PATH:-objcopy}
+
 cleanup () {
     rm -f ${SYMSFILE} ${KEEPSYMS}
 }
@@ -10,19 +14,20 @@ KEEPSYMS_IN=$2
 shift 2
 # $@ contains the actual build command
 OUT=$(echo "$@" | rev | cut -d ' ' -f 2- | rev | sed 's/.* -o \(.*\.o\).*/\1/')
+
 trap cleanup INT QUIT EXIT
 SYMSFILE=$(mktemp -p /tmp ${PREFIX}_rename.syms.XXXXX)
 KEEPSYMS=$(mktemp -p /tmp keep.syms.XXXXX)
 # find the libc used by gcc
 LIBC_SO=$("$@" --print-file-name=libc.so.6)
 cp ${KEEPSYMS_IN} ${KEEPSYMS}
 # get all symbols from libc and turn them into patterns
-nm -f p -g -D ${LIBC_SO} | sed -s 's/\([^ @]*\).*/^\1$/' >> ${KEEPSYMS}
+${NM} -f p -g -D ${LIBC_SO} | sed -s 's/\([^ @]*\).*/^\1$/' >> ${KEEPSYMS}
 # build the object
 "$@"
 # rename the symbols in the object
-nm -f p -g ${OUT} | cut -f1 -d' ' | grep -v -f ${KEEPSYMS} | sed -e "s/\(.*\)/\1\ ${PREFIX}_\1/" >> ${SYMSFILE}
+${NM} -f p -g ${OUT} | cut -f1 -d' ' | grep -v -f ${KEEPSYMS} | sed -e "s/\(.*\)/\1\ ${PREFIX}_\1/" >> ${SYMSFILE}
 if test -s ${SYMSFILE}
 then
-    objcopy --redefine-syms=${SYMSFILE} ${OUT}
+    ${OBJCOPY} --redefine-syms=${SYMSFILE} ${OUT}
 fi