Add dockerized include what you use tool

Introduces a tool that organizes C/C++ header includes. The tools output
should still be manually reviewed by a contributor.

README.md

@@ -76,7 +76,8 @@ openairinterface5g
 ├── openair3          : Layer 3 (3GPP LTE Rel-10 S1AP/GTP, NR Rel-15 NGAP/GTP)
 ├── openshift         : OpenShift helm charts for some deployment options of OAI
 ├── radio             : Drivers for various radios such as USRP, AW2S, RFsim, 7.2 FHI, ...
-└── targets           : Some configuration files; only historical relevance, and might be deleted in the future
+├── targets           : Some configuration files; only historical relevance, and might be deleted in the future
+└── tools             : Tools for use by the developers/ci machines: code analysis and formatting
 ```
 
 # How to get support from the OAI Community # 

doc/README.md

@@ -115,3 +115,8 @@ The other SDRs (AW2S, LimeSDR, ...) have no READMEs.
 
 - [UnitTests.md](./UnitTests.md) explains the unit testing setup
 - [TESTBenches.md](./TESTBenches.md) lists the CI setup and links to pipelines
+
+# Developer tools
+
+- [formatting](../tools/formatting/README.md) is a clang-format error detection tool
+- [iwyu](../tools/iwyu/README.md) is a tool to detect `#include` errors

tools/iwyu/README.md

+# Overview
+
+IWYU - [include what you use](https://github.com/include-what-you-use/include-what-you-use)
+is a tool that can detect and correct C/C++ include errors
+
+# Usage
+
+```
+TARGET=<your target> docker compose up
+```
+
+Automatically apply suggestions:
+
+```
+TARGET=<your target> docker compose run iwyu | tee suggestions
+cat suggestions | python3 ~/include-what-you-use/fix_includes.py
+```
+
+Apply only removal suggestions
+
+```
+cat suggestions | grep "should add these line\|The full include-list\|should remove these lines\|^-" | python3 ~/include-what-you-use/fix_includes.py
+```

tools/iwyu/docker-compose.yaml

+services:
+  iwyu:
+    image: iwyu
+    build:
+      dockerfile_inline: |
+        FROM ran-base
+        ENV DEBIAN_FRONTEND=noninteractive
+        RUN apt update && \
+          apt install -y wget gnupg && \
+          wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | apt-key add - && \
+          echo "deb http://apt.llvm.org/focal/ llvm-toolchain-focal-14 main" > /etc/apt/sources.list.d/llvm.list && \
+          apt update
+        RUN apt install -y \
+          git \
+          cmake \
+          build-essential \
+          clang-14 \
+          libclang-14-dev \
+          ninja-build \
+          libyaml-cpp-dev
+        WORKDIR /iwyu/
+        RUN git clone https://github.com/include-what-you-use/include-what-you-use.git
+        RUN cd /iwyu/include-what-you-use && \
+          git checkout origin/clang_14 && \
+          mkdir build && cd build && \
+          cmake -DCMAKE_CXX_COMPILER=g++ -DCMAKE_C_COMPILER=gcc ../ -G "Unix Makefiles" && \
+          make
+        RUN apt clean && rm -rf /var/lib/apt/lists/*
+    volumes:
+      - ../../:/code/
+    command:
+      bash -c "git config --global --add safe.directory /code && \
+        mkdir -p iwyu-bin && cd iwyu-bin && \
+        cmake \
+        -DCMAKE_C_INCLUDE_WHAT_YOU_USE=/iwyu/include-what-you-use/build/bin/include-what-you-use \
+        -DCMAKE_CXX_INCLUDE_WHAT_YOU_USE=/iwyu/include-what-you-use/build/bin/include-what-you-use \
+        /code/ \
+        -GNinja && \
+        cmake --build . --target $TARGET"