Fat runtime

cmake/build_wrapper.sh

@@ -0,0 +1,27 @@
+#!/bin/sh -e
+# This is used for renaming symbols for the fat runtime, don't call directly
+# TODO: make this a lot less fragile!
+PREFIX=$1
+KEEPSYMS_IN=$2
+shift 2
+BUILD=$@
+OUT=$(echo $BUILD | sed 's/.* -o \(.*\.o\).*/\1/')
+SYMSFILE=/tmp/${PREFIX}_rename.syms.$$
+KEEPSYMS=/tmp/keep.syms.$$
+# grab the command without the target obj or src file flags
+# we don't just call gcc directly as there may be flags modifying the arch
+CC_CMD=$(echo $BUILD | sed 's/ -o .*\.o//;s/ -c //;s/ .[^ ]*\.c//;')
+# find me a libc
+LIBC_SO=$(${CC_CMD} --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$/' >> ${KEEPSYMS}
+# build the object
+${BUILD}
+# 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}
+if test -s ${SYMSFILE}
+then
+    objcopy --redefine-syms=${SYMSFILE} ${OUT}
+fi
+rm -f ${SYMSFILE} ${KEEPSYMS}