#

# Copyright (c) 2011, 2016, 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 the standard C/C++ runtime libraries.

#

# Most importantly, determine if stdc++ should be linked statically or

# dynamically.

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

AC_DEFUN_ONCE([LIB_SETUP_STD_LIBS],

[

  # statically link libstdc++ before C++ ABI is stablized on Linux unless

  # dynamic build is configured on command line.

  AC_ARG_WITH([stdc++lib], [AS_HELP_STRING([--with-stdc++lib=<static>,<dynamic>,<default>],

      [force linking of the C++ runtime on Linux to either static or dynamic, default is static with dynamic as fallback])],

      [

        if test "x$with_stdc__lib" != xdynamic && test "x$with_stdc__lib" != xstatic \

                && test "x$with_stdc__lib" != xdefault; then

          AC_MSG_ERROR([Bad parameter value --with-stdc++lib=$with_stdc__lib!])

        fi

      ],

      [with_stdc__lib=default]

  )

  if test "x$OPENJDK_TARGET_OS" = xlinux; then

    # Test if -lstdc++ works.

    AC_MSG_CHECKING([if dynamic link of stdc++ is possible])

    AC_LANG_PUSH(C++)

    OLD_CXXFLAGS="$CXXFLAGS"

    CXXFLAGS="$CXXFLAGS -lstdc++"

    AC_LINK_IFELSE([AC_LANG_PROGRAM([], [return 0;])],

        [has_dynamic_libstdcxx=yes],

        [has_dynamic_libstdcxx=no])

    CXXFLAGS="$OLD_CXXFLAGS"

    AC_LANG_POP(C++)

    AC_MSG_RESULT([$has_dynamic_libstdcxx])

    # Test if stdc++ can be linked statically.

    AC_MSG_CHECKING([if static link of stdc++ is possible])

    STATIC_STDCXX_FLAGS="-Wl,-Bstatic -lstdc++ -lgcc -Wl,-Bdynamic"

    AC_LANG_PUSH(C++)

    OLD_LIBS="$LIBS"

    OLD_CXX="$CXX"

    LIBS="$STATIC_STDCXX_FLAGS"

    CXX="$CC"

    AC_LINK_IFELSE([AC_LANG_PROGRAM([], [return 0;])],

        [has_static_libstdcxx=yes],

        [has_static_libstdcxx=no])

    LIBS="$OLD_LIBS"

    CXX="$OLD_CXX"

    AC_LANG_POP(C++)

    AC_MSG_RESULT([$has_static_libstdcxx])

    if test "x$has_static_libstdcxx" = xno && test "x$has_dynamic_libstdcxx" = xno; then

      AC_MSG_ERROR([Cannot link to stdc++, neither dynamically nor statically!])

    fi

    if test "x$with_stdc__lib" = xstatic && test "x$has_static_libstdcxx" = xno; then

      AC_MSG_ERROR([Static linking of libstdc++ was not possible!])

    fi

    if test "x$with_stdc__lib" = xdynamic && test "x$has_dynamic_libstdcxx" = xno; then

      AC_MSG_ERROR([Dynamic linking of libstdc++ was not possible!])

    fi

    # If dynamic was requested, it's available since it would fail above otherwise.

    # If dynamic wasn't requested, go with static unless it isn't available.

    AC_MSG_CHECKING([how to link with libstdc++])

    if test "x$with_stdc__lib" = xdynamic || test "x$has_static_libstdcxx" = xno || HOTSPOT_CHECK_JVM_VARIANT(zeroshark); then

      LIBCXX="$LIBCXX -lstdc++"

      # To help comparisons with old build, put stdc++ first in JVM_LIBS

      JVM_LIBS="-lstdc++ $JVM_LIBS"

      # Ideally, we should test stdc++ for the BUILD toolchain separately. For now

      # just use the same setting as for the TARGET toolchain.

      OPENJDK_BUILD_JVM_LIBS="-lstdc++ $OPENJDK_BUILD_JVM_LIBS"

      LDCXX="$CXX"

      STATIC_CXX_SETTING="STATIC_CXX=false"

      AC_MSG_RESULT([dynamic])

    else

      LIBCXX="$LIBCXX $STATIC_STDCXX_FLAGS"

      JVM_LDFLAGS="$JVM_LDFLAGS -static-libgcc"

      # To help comparisons with old build, put stdc++ first in JVM_LIBS

      JVM_LIBS="-Wl,-Bstatic -lstdc++ -Wl,-Bdynamic $JVM_LIBS"

      # Ideally, we should test stdc++ for the BUILD toolchain separately. For now

      # just use the same setting as for the TARGET toolchain.

      OPENJDK_BUILD_JVM_LDFLAGS="$OPENJDK_BUILD_JVM_LDFLAGS -static-libgcc"

      OPENJDK_BUILD_JVM_LIBS="-Wl,-Bstatic -lstdc++ -Wl,-Bdynamic $OPENJDK_BUILD_JVM_LIBS"

      LDCXX="$CC"

      STATIC_CXX_SETTING="STATIC_CXX=true"

      AC_MSG_RESULT([static])

    fi

  fi

  AC_SUBST(STATIC_CXX_SETTING)

  # libCrun is the c++ runtime-library with SunStudio (roughly the equivalent of gcc's libstdc++.so)

  if test "x$TOOLCHAIN_TYPE" = xsolstudio && test "x$LIBCXX" = x; then

    LIBCXX="${SYSROOT}/usr/lib${OPENJDK_TARGET_CPU_ISADIR}/libCrun.so.1"

  fi

  # TODO better (platform agnostic) test

  if test "x$OPENJDK_TARGET_OS" = xmacosx && test "x$LIBCXX" = x && test "x$TOOLCHAIN_TYPE" = xgcc; then

    LIBCXX="-lstdc++"

  fi

  AC_SUBST(LIBCXX)

  # Setup Windows runtime dlls

  if test "x$OPENJDK_TARGET_OS" = "xwindows"; then

    TOOLCHAIN_SETUP_VS_RUNTIME_DLLS

  fi

])