arch/powerpc/tools/gcc-check-mprofile-kernel.sh

   1 #!/bin/bash
   2 # SPDX-License-Identifier: GPL-2.0
   3
   4 set -e
   5 set -o pipefail
   6
   7 # To debug, uncomment the following line
   8 # set -x
   9
  10 # -mprofile-kernel is only supported on 64le, so this should not be invoked
  11 # for other targets. Therefore we can pass in -m64 and -mlittle-endian
  12 # explicitly, to take care of toolchains defaulting to other targets.
  13
  14 # Test whether the compile option -mprofile-kernel exists and generates
  15 # profiling code (ie. a call to _mcount()).
  16 echo "int func() { return 0; }" | \
  17     $* -m64 -mlittle-endian -S -x c -O2 -p -mprofile-kernel - -o - \
  18     2> /dev/null | grep -q "_mcount"
  19
  20 # Test whether the notrace attribute correctly suppresses calls to _mcount().
  21
  22 echo -e "#include <linux/compiler.h>\nnotrace int func() { return 0; }" | \
  23     $* -m64 -mlittle-endian -S -x c -O2 -p -mprofile-kernel - -o - \
  24     2> /dev/null | grep -q "_mcount" && \
  25     exit 1
  26
  27 exit 0