casaroli commented on code in PR #19940:
URL: https://github.com/apache/nuttx/pull/19940#discussion_r3879796654


##########
tools/fdpic/build-binutils.sh:
##########
@@ -0,0 +1,84 @@
+#!/bin/bash
+############################################################################
+# tools/fdpic/build-binutils.sh
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.  The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+# Build arm-uclinuxfdpiceabi binutils -- the only part of the module
+# toolchain that has to be built from source.
+#
+# The compiling is done by the stock Arm bare-metal toolchain, which emits
+# correct FDPIC objects for both C and C++.  What it cannot do is *link*
+# them: arm-none-eabi-ld is configured with the `armelf` emulation alone, so
+# it produces an object marked "UNIX - System V" that the loader refuses.

Review Comment:
   the linker is different.



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