scripts/libc: do not build add-ons by default

Currently, no --enable-add-ons option is passed to libc configure when
"$(do_libc_add_ons_list ,)" is empty, which makes configure automatically search
for present add-ons. In that case, all present add-ons are built, although
no add-on was selected by the user in the config. Moreover, this can make the
configure fail if some non-standard add-ons like eglibc-localedef are present.

This behavior also leads to an inconsistency from a user point of view between
the following cases:
- LIBC_ADDONS_LIST="", LIBC_GLIBC_USE_PORTS=n and THREADS="none" in the config,
which makes "$(do_libc_add_ons_list ,)" return "", so all present add-ons
are built.
- LIBC_ADDONS_LIST="", LIBC_GLIBC_USE_PORTS=n and THREADS!="none" in the
config, which makes "$(do_libc_add_ons_list ,)" return the add-on supporting
the chosen threading implementation, e.g. "nptl", so only this add-on is
built.

This patch disables the building of all add-ons in that case.

It is still possible to build all present add-ons by adding --enable-add-ons to
LIBC_GLIBC_EXTRA_CONFIG_ARRAY.

Signed-off-by: "Benoît THÉBAUDEAU" <benoit.thebaudeau@advansee.com>

# This file adds the functions to build the GCC test suite

# Copyright 2010 DoréDevelopment

# Created by Martin Lund <mgl@doredevelopment.dk>

# Licensed under the GPL v2. See COPYING in the root of this package

do_test_suite_gcc_get() { :; }

do_test_suite_gcc_extract() { :; }

do_test_suite_gcc_build() { :; }

# Overide functions depending on configuration

if [ "${CT_TEST_SUITE_GCC}" = "y" ]; then

do_test_suite_gcc_build() {

    CT_DoStep INFO "Installing GCC test suite"

    CT_DoExecLog ALL mkdir -p "${CT_TEST_SUITE_DIR}/gcc"

    CT_DoExecLog ALL cp -a "${CT_LIB_DIR}/contrib/gcc-test-suite/default.cfg"               \

                           "${CT_LIB_DIR}/contrib/gcc-test-suite/Makefile"                  \

                           "${CT_LIB_DIR}/contrib/gcc-test-suite/README"                    \

                           "${CT_SRC_DIR}/gcc-${CT_CC_VERSION}/gcc/testsuite"               \

                           "${CT_TEST_SUITE_DIR}/gcc"

    CT_DoExecLog ALL sed -i -r -e "s/@@DG_TARGET@@/${CT_TARGET}/g;"     \

                         "${CT_TEST_SUITE_DIR}/gcc/Makefile"

    CT_EndStep

}

fi # CT_TEST_SUITE_GCC