#

# Copyright (c) 2011, 2018, Oracle and/or its affiliates. All rights reserved.

# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

#

# This code is free software; you can redistribute it and/or modify it

# under the terms of the GNU General Public License version 2 only, as

# published by the Free Software Foundation.  Oracle designates this

# particular file as subject to the "Classpath" exception as provided

# by Oracle in the LICENSE file that accompanied this code.

#

# This code is distributed in the hope that it will be useful, but WITHOUT

# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

# version 2 for more details (a copy is included in the LICENSE file that

# accompanied this code).

#

# You should have received a copy of the GNU General Public License version

# 2 along with this work; if not, write to the Free Software Foundation,

# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

#

# Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

# or visit www.oracle.com if you need additional information or have any

# questions.

#

################################################################################

#

# Setup flags for C/C++ compiler

#

###############################################################################

#

# How to compile shared libraries.

#

AC_DEFUN([FLAGS_SETUP_SHARED_LIBS],

[

  if test "x$TOOLCHAIN_TYPE" = xgcc; then

    PICFLAG="-fPIC"

    C_FLAG_REORDER=''

    CXX_FLAG_REORDER=''

    if test "x$OPENJDK_TARGET_OS" = xmacosx; then

      # Linking is different on MacOSX

      if test "x$STATIC_BUILD" = xtrue; then

        SHARED_LIBRARY_FLAGS ='-undefined dynamic_lookup'

      else

        SHARED_LIBRARY_FLAGS="-dynamiclib -compatibility_version 1.0.0 -current_version 1.0.0 -fPIC"

      fi

      SET_EXECUTABLE_ORIGIN='-Wl,-rpath,@loader_path$(or [$]1,/.)'

      SET_SHARED_LIBRARY_ORIGIN="$SET_EXECUTABLE_ORIGIN"

      SET_SHARED_LIBRARY_NAME='-Wl,-install_name,@rpath/[$]1'

      SET_SHARED_LIBRARY_MAPFILE='-Wl,-exported_symbols_list,[$]1'

    else

      # Default works for linux, might work on other platforms as well.

      SHARED_LIBRARY_FLAGS='-shared'

      SET_EXECUTABLE_ORIGIN='-Wl,-rpath,\$$ORIGIN[$]1'

      SET_SHARED_LIBRARY_ORIGIN="-Wl,-z,origin $SET_EXECUTABLE_ORIGIN"

      SET_SHARED_LIBRARY_NAME='-Wl,-soname=[$]1'

      SET_SHARED_LIBRARY_MAPFILE='-Wl,-version-script=[$]1'

    fi

  elif test "x$TOOLCHAIN_TYPE" = xclang; then

    C_FLAG_REORDER=''

    CXX_FLAG_REORDER=''

    if test "x$OPENJDK_TARGET_OS" = xmacosx; then

      # Linking is different on MacOSX

      PICFLAG=''

      SHARED_LIBRARY_FLAGS="-dynamiclib -compatibility_version 1.0.0 -current_version 1.0.0"

      SET_EXECUTABLE_ORIGIN='-Wl,-rpath,@loader_path$(or [$]1,/.)'

      SET_SHARED_LIBRARY_ORIGIN="$SET_EXECUTABLE_ORIGIN"

      SET_SHARED_LIBRARY_NAME='-Wl,-install_name,@rpath/[$]1'

      SET_SHARED_LIBRARY_MAPFILE='-Wl,-exported_symbols_list,[$]1'

    else

      # Default works for linux, might work on other platforms as well.

      PICFLAG='-fPIC'

      SHARED_LIBRARY_FLAGS='-shared'

      SET_EXECUTABLE_ORIGIN='-Wl,-rpath,\$$ORIGIN[$]1'

      SET_SHARED_LIBRARY_NAME='-Wl,-soname=[$]1'

      SET_SHARED_LIBRARY_MAPFILE='-Wl,-version-script=[$]1'

      # arm specific settings

      if test "x$OPENJDK_TARGET_CPU" = "xarm"; then

        # '-Wl,-z,origin' isn't used on arm.

        SET_SHARED_LIBRARY_ORIGIN='-Wl,-rpath,\$$$$ORIGIN[$]1'

      else

        SET_SHARED_LIBRARY_ORIGIN="-Wl,-z,origin $SET_EXECUTABLE_ORIGIN"

      fi

    fi

  elif test "x$TOOLCHAIN_TYPE" = xsolstudio; then

    if test "x$OPENJDK_TARGET_CPU" = xsparcv9; then

      PICFLAG="-xcode=pic32"

    else

      PICFLAG="-KPIC"

    fi

    C_FLAG_REORDER='-xF'

    CXX_FLAG_REORDER='-xF'

    SHARED_LIBRARY_FLAGS="-G"

    SET_EXECUTABLE_ORIGIN='-R\$$ORIGIN[$]1'

    SET_SHARED_LIBRARY_ORIGIN="$SET_EXECUTABLE_ORIGIN"

    SET_SHARED_LIBRARY_NAME='-h [$]1'

    SET_SHARED_LIBRARY_MAPFILE='-M[$]1'

  elif test "x$TOOLCHAIN_TYPE" = xxlc; then

    # '-qpic' defaults to 'qpic=small'. This means that the compiler generates only

    # one instruction for accessing the TOC. If the TOC grows larger than 64K, the linker

    # will have to patch this single instruction with a call to some out-of-order code which

    # does the load from the TOC. This is of course slow. But in that case we also would have

    # to use '-bbigtoc' for linking anyway so we could also change the PICFLAG to 'qpic=large'.

    # With 'qpic=large' the compiler will by default generate a two-instruction sequence which

    # can be patched directly by the linker and does not require a jump to out-of-order code.

    # Another alternative instead of using 'qpic=large -bbigtoc' may be to use '-qminimaltoc'

    # instead. This creates a distinct TOC for every compilation unit (and thus requires two

    # loads for accessing a global variable). But there are rumors that this may be seen as a

    # 'performance feature' because of improved code locality of the symbols used in a

    # compilation unit.

    PICFLAG="-qpic"

    C_FLAG_REORDER=''

    CXX_FLAG_REORDER=''

    SHARED_LIBRARY_FLAGS="-qmkshrobj -bM:SRE -bnoentry"

    SET_EXECUTABLE_ORIGIN=""

    SET_SHARED_LIBRARY_ORIGIN=''

    SET_SHARED_LIBRARY_NAME=''

    SET_SHARED_LIBRARY_MAPFILE=''

  elif test "x$TOOLCHAIN_TYPE" = xmicrosoft; then

    PICFLAG=""

    C_FLAG_REORDER=''

    CXX_FLAG_REORDER=''

    SHARED_LIBRARY_FLAGS="-dll"

    SET_EXECUTABLE_ORIGIN=''

    SET_SHARED_LIBRARY_ORIGIN=''

    SET_SHARED_LIBRARY_NAME=''

    SET_SHARED_LIBRARY_MAPFILE='-def:[$]1'

  fi

  AC_SUBST(C_FLAG_REORDER)

  AC_SUBST(CXX_FLAG_REORDER)

  AC_SUBST(SET_EXECUTABLE_ORIGIN)

  AC_SUBST(SET_SHARED_LIBRARY_ORIGIN)

  AC_SUBST(SET_SHARED_LIBRARY_NAME)

  AC_SUBST(SET_SHARED_LIBRARY_MAPFILE)

  AC_SUBST(SHARED_LIBRARY_FLAGS)

])

AC_DEFUN([FLAGS_SETUP_DEBUG_SYMBOLS],

[

  # Debug symbols

  if test "x$TOOLCHAIN_TYPE" = xgcc; then

    if test "x$OPENJDK_TARGET_CPU_BITS" = "x64" && test "x$DEBUG_LEVEL" = "xfastdebug"; then

      CFLAGS_DEBUG_SYMBOLS="-g1"

    else

      CFLAGS_DEBUG_SYMBOLS="-g"

    fi

  elif test "x$TOOLCHAIN_TYPE" = xclang; then

    CFLAGS_DEBUG_SYMBOLS="-g"

  elif test "x$TOOLCHAIN_TYPE" = xsolstudio; then

    CFLAGS_DEBUG_SYMBOLS="-g -xs"

    # -g0 enables debug symbols without disabling inlining.

    CXXFLAGS_DEBUG_SYMBOLS="-g0 -xs"

  elif test "x$TOOLCHAIN_TYPE" = xxlc; then

    CFLAGS_DEBUG_SYMBOLS="-g"

  elif test "x$TOOLCHAIN_TYPE" = xmicrosoft; then

    CFLAGS_DEBUG_SYMBOLS="-Zi"

  fi

  AC_SUBST(CFLAGS_DEBUG_SYMBOLS)

  AC_SUBST(CXXFLAGS_DEBUG_SYMBOLS)

  # FIXME: This was never used in the old build. What to do with it?

  if test "x$TOOLCHAIN_TYPE" = xgcc; then

    # "-Og" suppported for GCC 4.8 and later

    CFLAG_OPTIMIZE_DEBUG_FLAG="-Og"

    FLAGS_COMPILER_CHECK_ARGUMENTS(ARGUMENT: [$CFLAG_OPTIMIZE_DEBUG_FLAG],

      IF_TRUE: [HAS_CFLAG_OPTIMIZE_DEBUG=true],

      IF_FALSE: [HAS_CFLAG_OPTIMIZE_DEBUG=false])

  fi

])

AC_DEFUN([FLAGS_SETUP_QUALITY_CHECKS],

[

  # bounds, memory and behavior checking options

  if test "x$TOOLCHAIN_TYPE" = xgcc; then

    case $DEBUG_LEVEL in

    release )

      # no adjustment

      ;;

    fastdebug )

      # no adjustment

      ;;

    slowdebug )

      # FIXME: By adding this to C(XX)FLAGS_DEBUG_OPTIONS/JVM_CFLAGS_SYMBOLS it

      # get's added conditionally on whether we produce debug symbols or not.

      # This is most likely not really correct.

      # Add runtime stack smashing and undefined behavior checks.

      # Not all versions of gcc support -fstack-protector

      STACK_PROTECTOR_CFLAG="-fstack-protector-all"

      FLAGS_COMPILER_CHECK_ARGUMENTS(ARGUMENT: [$STACK_PROTECTOR_CFLAG -Werror], IF_FALSE: [STACK_PROTECTOR_CFLAG=""])

      CFLAGS_DEBUG_OPTIONS="$STACK_PROTECTOR_CFLAG --param ssp-buffer-size=1"

      CXXFLAGS_DEBUG_OPTIONS="$STACK_PROTECTOR_CFLAG --param ssp-buffer-size=1"

      ;;

    esac

  fi

])

AC_DEFUN([FLAGS_SETUP_OPTIMIZATION],

[

  # Optimization levels

  if test "x$TOOLCHAIN_TYPE" = xsolstudio; then

    if test "x$OPENJDK_TARGET_CPU_ARCH" = "xx86"; then

    elif test "x$OPENJDK_TARGET_CPU_ARCH" = "xsparc"; then

      C_O_FLAG_HI="-xO4 -Wc,-Qrm-s -Wc,-Qiselect-T0"

      C_O_FLAG_NORM="-xO2 -Wc,-Qrm-s -Wc,-Qiselect-T0"

      C_O_FLAG_DEBUG_JVM=""

    fi

  fi

  # Adjust optimization flags according to debug level.

  case $DEBUG_LEVEL in

    release )

      # no adjustment

      ;;

    fastdebug )

      # Not quite so much optimization

      C_O_FLAG_HI="$C_O_FLAG_NORM"

      CXX_O_FLAG_HI="$CXX_O_FLAG_NORM"

      ;;

    slowdebug )

      # Disable optimization

      C_O_FLAG_HIGHEST_JVM="$C_O_FLAG_DEBUG_JVM"

      C_O_FLAG_HIGHEST="$C_O_FLAG_DEBUG"

      C_O_FLAG_HI="$C_O_FLAG_DEBUG"

      C_O_FLAG_NORM="$C_O_FLAG_DEBUG"

      C_O_FLAG_SIZE="$C_O_FLAG_DEBUG"

      CXX_O_FLAG_HIGHEST_JVM="$CXX_O_FLAG_DEBUG_JVM"

      CXX_O_FLAG_HIGHEST="$CXX_O_FLAG_DEBUG"

      CXX_O_FLAG_HI="$CXX_O_FLAG_DEBUG"

      CXX_O_FLAG_NORM="$CXX_O_FLAG_DEBUG"

      CXX_O_FLAG_SIZE="$CXX_O_FLAG_DEBUG"

      ;;

  esac

  AC_SUBST(C_O_FLAG_HIGHEST_JVM)

  AC_SUBST(C_O_FLAG_HIGHEST)

  AC_SUBST(C_O_FLAG_HI)

  AC_SUBST(C_O_FLAG_NORM)

  AC_SUBST(C_O_FLAG_NONE)

  AC_SUBST(C_O_FLAG_SIZE)

  AC_SUBST(CXX_O_FLAG_HIGHEST_JVM)

  AC_SUBST(CXX_O_FLAG_HIGHEST)

  AC_SUBST(CXX_O_FLAG_HI)

  AC_SUBST(CXX_O_FLAG_NORM)

  AC_SUBST(CXX_O_FLAG_NONE)

  AC_SUBST(CXX_O_FLAG_SIZE)

])