jdk-24/make/autoconf/lib-std.m4

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