Add newlib-nano as companion lib

This allows building newlib-nano in addition to newlib and picolibc,
allowing users to select between C libraries within the same toolchain.

Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 128 insertions, 0 deletions

diff --git a/scripts/build/companion_libs/350-newlib_nano.sh b/scripts/build/companion_libs/350-newlib_nano.sh
new file mode 100644
index 0000000..c9a7396
--- /dev/null
+++ b/scripts/build/companion_libs/350-newlib_nano.sh
@@ -0,0 +1,128 @@
+# This file adds functions to build the Newlib library using the 'nano' configuration
+# Copyright © 2021 Keith Packard
+# Licensed under the GPL v2 or later. See COPYING in the root of this package
+#
+# Edited by Keith Packard <keithp@keithp.com>
+#
+
+do_newlib_nano_get() { :; }
+do_newlib_nano_extract() { :; }
+do_newlib_nano_for_build() { :; }
+do_newlib_nano_for_host() { :; }
+do_newlib_nano_for_target() { :; }
+
+if [ "${CT_COMP_LIBS_NEWLIB_NANO}" = "y" ]; then
+
+# Download newlib_nano
+do_newlib_nano_get() {
+    CT_Fetch NEWLIB_NANO
+}
+
+do_newlib_nano_extract() {
+    CT_ExtractPatch NEWLIB_NANO
+}
+
+do_newlib_nano_for_target() {
+    local -a newlib_nano_opts
+    local cflags_for_target
+
+    CT_DoStep INFO "Installing Newlib Nano library"
+
+    CT_mkdir_pushd "${CT_BUILD_DIR}/build-newlib_nano-build-${CT_BUILD}"
+
+    CT_DoLog EXTRA "Configuring Newlib Nano library"
+
+    # Multilib is the default, so if it is not enabled, disable it.
+    if [ "${CT_MULTILIB}" != "y" ]; then
+        newlib_nano_opts+=("-Dmultilib=false")
+    fi
+
+    if [ "${CT_LIBC_NEWLIB_NANO_IO_FLOAT}" = "y" ]; then
+        newlib_opts+=( "--enable-newlib-io-float" )
+        if [ "${CT_LIBC_NEWLIB_NANO_IO_LDBL}" = "y" ]; then
+            newlib_opts+=( "--enable-newlib-io-long-double" )
+        else
+            newlib_opts+=( "--disable-newlib-io-long-double" )
+        fi
+    else
+        newlib_opts+=( "--disable-newlib-io-float" )
+        newlib_opts+=( "--disable-newlib-io-long-double" )
+    fi
+
+    if [ "${CT_LIBC_NEWLIB_NANO_DISABLE_SUPPLIED_SYSCALLS}" = "y" ]; then
+        newlib_opts+=( "--disable-newlib-supplied-syscalls" )
+    else
+        newlib_opts+=( "--enable-newlib-supplied-syscalls" )
+    fi
+
+    yn_args="IO_POS_ARGS:newlib-io-pos-args
+IO_C99FMT:newlib-io-c99-formats
+IO_LL:newlib-io-long-long
+REGISTER_FINI:newlib-register-fini
+NANO_MALLOC:newlib-nano-malloc
+NANO_FORMATTED_IO:newlib-nano-formatted-io
+ATEXIT_DYNAMIC_ALLOC:newlib-atexit-dynamic-alloc
+GLOBAL_ATEXIT:newlib-global-atexit
+LITE_EXIT:lite-exit
+REENT_SMALL:newlib-reent-small
+MULTITHREAD:newlib-multithread
+RETARGETABLE_LOCKING:newlib-retargetable-locking
+WIDE_ORIENT:newlib-wide-orient
+FSEEK_OPTIMIZATION:newlib-fseek-optimization
+FVWRITE_IN_STREAMIO:newlib-fvwrite-in-streamio
+UNBUF_STREAM_OPT:newlib-unbuf-stream-opt
+ENABLE_TARGET_OPTSPACE:target-optspace
+    "
+
+    for ynarg in $yn_args; do
+        var="CT_LIBC_NEWLIB_NANO_${ynarg%:*}"
+        eval var=\$${var}
+        argument=${ynarg#*:}
+
+
+        if [ "${var}" = "y" ]; then
+            newlib_opts+=( "--enable-$argument" )
+        else
+            newlib_opts+=( "--disable-$argument" )
+        fi
+    done
+
+    [ "${CT_LIBC_NEWLIB_NANO_EXTRA_SECTIONS}" = "y" ] && \
+        CT_LIBC_NEWLIB_NANO_TARGET_CFLAGS="${CT_LIBC_NEWLIB_NANO_TARGET_CFLAGS} -ffunction-sections -fdata-sections"
+
+    [ "${CT_LIBC_NEWLIB_NANO_LTO}" = "y" ] && \
+        CT_LIBC_NEWLIB_NANO_TARGET_CFLAGS="${CT_LIBC_NEWLIB_NANO_TARGET_CFLAGS} -flto"
+
+    cflags_for_target="${CT_ALL_TARGET_CFLAGS} ${CT_LIBC_NEWLIB_NANO_TARGET_CFLAGS}"
+
+    # Note: newlib handles the build/host/target a little bit differently
+    # than one would expect:
+    #   build  : not used
+    #   host   : the machine building newlib
+    #   target : the machine newlib runs on
+    CT_DoExecLog CFG                                               \
+    CC_FOR_BUILD="${CT_BUILD}-gcc"                                 \
+    CFLAGS_FOR_TARGET="${cflags_for_target}"                       \
+    AR_FOR_TARGET="`which ${CT_TARGET}-gcc-ar`"                    \
+    RANLIB_FOR_TARGET="`which ${CT_TARGET}-gcc-ranlib`"            \
+    ${CONFIG_SHELL}                                                \
+    "${CT_SRC_DIR}/newlib-nano/configure"                          \
+        --host=${CT_BUILD}                                         \
+        --target=${CT_TARGET}                                      \
+        --prefix=${CT_PREFIX_DIR}                                  \
+	--exec-prefix=${CT_PREFIX_DIR}/newlib-nano                 \
+	--libdir=${CT_PREFIX_DIR}/newlib-nano/${CT_TARGET}/lib     \
+        "${newlib_opts[@]}"                                        \
+        "${CT_LIBC_NEWLIB_NANO_EXTRA_CONFIG_ARRAY[@]}"
+
+    CT_DoLog EXTRA "Building Newlib Nano C library"
+    CT_DoExecLog ALL make ${CT_JOBSFLAGS}
+
+    CT_DoLog EXTRA "Installing Newlib Nano C library"
+    CT_DoExecLog ALL make install
+
+    CT_Popd
+    CT_EndStep
+}
+
+fi