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Datei: lib-std.m4 Sprache: Shell

#
# Copyright (c) 2011, 2020, 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 stabilized 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$OPENJDK_TARGET_OS" = xlinux; then
    # Test if stdc++ can be linked statically.
    AC_MSG_CHECKING([if static link of stdc++ is possible])
    STATIC_STDCXX_FLAGS="-static-libstdc++ -static-libgcc"
    AC_LANG_PUSH(C++)
    OLD_LIBS="$LIBS"
    LIBS="$STATIC_STDCXX_FLAGS"
    AC_LINK_IFELSE([AC_LANG_PROGRAM([], [return 0;])],
        [has_static_libstdcxx=yes],
        [has_static_libstdcxx=no])
    LIBS="$OLD_LIBS"
    AC_LANG_POP(C++)
    AC_MSG_RESULT([$has_static_libstdcxx])

    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 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 ; then
      AC_MSG_RESULT([dynamic])
    else
      LIBCXX="$LIBCXX $STATIC_STDCXX_FLAGS"
      JVM_LDFLAGS="$JVM_LDFLAGS $STATIC_STDCXX_FLAGS"
      ADLC_LDFLAGS="$ADLC_LDFLAGS $STATIC_STDCXX_FLAGS"
      # Ideally, we should test stdc++ for the BUILD toolchain separately. For now
      # just use the same setting as for the TARGET toolchain.
      OPENJDK_BUILD_JVM_LDFLAGS="$OPENJDK_BUILD_JVM_LDFLAGS $STATIC_STDCXX_FLAGS"
      AC_MSG_RESULT([static])
    fi
  fi

  AC_SUBST(LIBCXX)

  # Setup Windows runtime dlls
  if test "x$OPENJDK_TARGET_OS" = "xwindows"; then
    TOOLCHAIN_SETUP_VS_RUNTIME_DLLS
  fi
])

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