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    );
} else {
    $EXTRA_INCFLAGS = $EXTRA_DEFINES = $EXTRA_LDFLAGS = '';
    %CHECKLIB_ARGS = (
        LIBS        => '-lgrpc',
        header      => 'grpc/grpc.h',
    );
}

# sanity check
check_lib_or_exit(
    %CHECKLIB_ARGS,
    function    => 'grpc_version_string();',
);

check_lib(
    %CHECKLIB_ARGS,
    function    => <<'EOT',
grpc_op op; op.data.send_message.send_message = (grpc_byte_buffer *) NULL;
EOT
) and ($EXTRA_DEFINES .= " -DGRPC_VERSION_1_1");

check_lib(
    %CHECKLIB_ARGS,
    function    => <<'EOT',
grpc_call_details details;
grpc_call_details_init(&details);
grpc_slice_to_c_string(details.method);
EOT
) and ($EXTRA_DEFINES .= " -DGRPC_VERSION_1_2");

check_lib(
    %CHECKLIB_ARGS,
    function    => <<'EOT',
void (*call_unref)(grpc_call *call) = &grpc_call_unref;
EOT
) and ($EXTRA_DEFINES .= " -DGRPC_VERSION_1_4");

check_lib(
    %CHECKLIB_ARGS,
    header      => 'grpc/grpc_security.h',
    function    => <<'EOT',
return !GRPC_METADATA_CREDENTIALS_PLUGIN_SYNC_MAX;
EOT
) and ($EXTRA_DEFINES .= " -DGRPC_VERSION_1_7");

check_lib(
    %CHECKLIB_ARGS,
    function    => <<'EOT',
return 0;
grpc_op op;
op.data.recv_status_on_client.error_string = 0;
EOT
) and ($EXTRA_DEFINES .= " -DGRPC_RECV_STATUS_ON_CLIENT_HAS_ERROR_STRING");

check_lib(
    %CHECKLIB_ARGS,
    header => [$CHECKLIB_ARGS{header}, "grpc/grpc_security.h"],
    function    => <<'EOT',
return 0;
grpc_ssl_credentials_create(0, 0, 0, 0);
EOT
) and ($EXTRA_DEFINES .= " -DGRPC_SSL_CREDENTIALS_HAS_4_ARGS");

check_lib(
    %CHECKLIB_ARGS,
    header => [$CHECKLIB_ARGS{header}, "grpc/grpc_security.h"],
    function    => <<'EOT',
grpc_metadata_credentials_plugin plugin;
return 0;
grpc_metadata_credentials_create_from_plugin(plugin, 0, NULL);
EOT
) and ($EXTRA_DEFINES .= " -DGRPC_METADATA_CREDENTIALS_CRATE_FROM_PLUGIN_HAS_3_ARGS");

check_lib(
    %CHECKLIB_ARGS,
    header => [$CHECKLIB_ARGS{header}, "grpc/grpc_security.h"],
    function    => <<'EOT',
return 0;
grpc_google_default_credentials_create(NULL);
EOT
) and ($EXTRA_DEFINES .= " -DGRPC_GOOGLE_DEFAULT_CREDENTIALS_CREATE_HAS_1_ARG");

check_lib(
    %CHECKLIB_ARGS,
    function    => <<'EOT',
grpc_channel_credentials * cred = NULL;
return 0;
EOT
) and ($EXTRA_DEFINES .= " -DGRPC_NO_INSECURE_BUILD");

# grpc_shutdown() is async in recent versions of the library, leading
# to a race at shutdown which can cause fork to fail. See
# https://github.com/joyrex2001/grpc-perl/issues/22.
# If the library has grpc_shutdown_blocking(), use that.
check_lib(
    %CHECKLIB_ARGS,
    function    => <<'EOT',
void *p = grpc_shutdown_blocking;
return 0;
EOT
) and ($EXTRA_DEFINES .= " -DGRPC_HAS_SHUTDOWN_BLOCKING");


WriteMakefile(
      NAME                  => 'Grpc::XS',
      VERSION_FROM          => 'lib/Grpc/XS.pm',
      AUTHOR                => 'Vincent van Dam',
      LIBS                  => ["$EXTRA_LDFLAGS -lgrpc"],
      DEFINE                => $EXTRA_DEFINES,
      INC                   => "$EXTRA_INCFLAGS -I.",
      C                     => [ "Grpc.c", "util.c" ],
      OBJECT                => '$(O_FILES)',
      OPTIMIZE              => $DEBUG ? '-g' : '-O2',
      CONFIGURE_REQUIRES    => {
          'Devel::CheckLib'     => 0,
      },
      META_MERGE => {
          resources => {
              repository => 'https://github.com/joyrex2001/grpc-perl',
              bugtracker => 'https://github.com/joyrex2001/grpc-perl/issues',
              homepage   => 'https://github.com/joyrex2001/grpc-perl',
          },
      },
    );