name : gcc-check-mprofile-kernel.sh #!/bin/bash # SPDX-License-Identifier: GPL-2.0 set -e set -o pipefail # To debug, uncomment the following line # set -x # -mprofile-kernel is only supported on 64-bit with ELFv2, so this should not # be invoked for other targets. Therefore we can pass in -m64 and -mabi # explicitly, to take care of toolchains defaulting to other targets. # Test whether the compile option -mprofile-kernel exists and generates # profiling code (ie. a call to _mcount()). echo "int func() { return 0; }" | \ $* -m64 -mabi=elfv2 -S -x c -O2 -p -mprofile-kernel - -o - \ 2> /dev/null | grep -q "_mcount" # Test whether the notrace attribute correctly suppresses calls to _mcount(). echo -e "#include <linux/compiler.h>\nnotrace int func() { return 0; }" | \ $* -m64 -mabi=elfv2 -S -x c -O2 -p -mprofile-kernel - -o - \ 2> /dev/null | grep -q "_mcount" && \ exit 1 exit 0