From 2d536b08535d21caf372c939f54df1fadf8f95e9 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Sun, 28 Dec 2025 22:09:59 +0000
Subject: [PATCH] Switch to Clang as default compiler in CI/CD and Docker

Co-authored-by: johndoe6345789 <224850594+johndoe6345789@users.noreply.github.com>
---
 .github/workflows/qemu-test.yml  |  3 ++-
 .github/workflows/release.yml    |  3 ++-
 .github/workflows/unit-tests.yml |  4 ++--
 Dockerfile                       |  7 +++++--
 README.md                        | 10 +++++-----
 5 files changed, 16 insertions(+), 11 deletions(-)

diff --git a/.github/workflows/qemu-test.yml b/.github/workflows/qemu-test.yml
index 9efa83e..51829d7 100644
--- a/.github/workflows/qemu-test.yml
+++ b/.github/workflows/qemu-test.yml
@@ -25,6 +25,7 @@ jobs:
         sudo apt-get update
         sudo apt-get install -y \
           build-essential \
+          clang \
           cmake \
           nasm \
           qemu-system-x86 \
@@ -49,7 +50,7 @@ jobs:
       run: |
         mkdir -p build
         cd build
-        cmake .. -DCMAKE_TOOLCHAIN_FILE=../build/Release/generators/conan_toolchain.cmake
+        CC=clang CXX=clang++ cmake .. -DCMAKE_TOOLCHAIN_FILE=../build/Release/generators/conan_toolchain.cmake
     
     - name: Build bootloader and kernel
       run: |
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 9908761..2cc3df1 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -24,6 +24,7 @@ jobs:
         sudo apt-get update
         sudo apt-get install -y \
           build-essential \
+          clang \
           cmake \
           nasm \
           qemu-system-x86 \
@@ -47,7 +48,7 @@ jobs:
       run: |
         mkdir -p build
         cd build
-        cmake .. -DCMAKE_TOOLCHAIN_FILE=../build/Release/generators/conan_toolchain.cmake
+        CC=clang CXX=clang++ cmake .. -DCMAKE_TOOLCHAIN_FILE=../build/Release/generators/conan_toolchain.cmake
     
     - name: Build bootloader and kernel
       run: |
diff --git a/.github/workflows/unit-tests.yml b/.github/workflows/unit-tests.yml
index 20f373d..1e0c9a2 100644
--- a/.github/workflows/unit-tests.yml
+++ b/.github/workflows/unit-tests.yml
@@ -22,7 +22,7 @@ jobs:
         set -e  # Exit on any error
         
         sudo apt-get update
-        sudo apt-get install -y build-essential cmake python3 python3-pip
+        sudo apt-get install -y build-essential clang cmake python3 python3-pip
         
         # Install Conan
         pip3 install conan
@@ -38,7 +38,7 @@ jobs:
       run: |
         mkdir -p build
         cd build
-        cmake .. -DCMAKE_TOOLCHAIN_FILE=../build/Release/generators/conan_toolchain.cmake
+        CC=clang CXX=clang++ cmake .. -DCMAKE_TOOLCHAIN_FILE=../build/Release/generators/conan_toolchain.cmake
     
     - name: Build unit tests
       run: |
diff --git a/Dockerfile b/Dockerfile
index 320e0ca..caf276f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -13,8 +13,9 @@ WORKDIR /metalos
 RUN apt-get update && apt-get install -y \
     # Build essentials
     build-essential \
-    gcc \
-    g++ \
+    clang \
+    clang++ \
+    lld \
     nasm \
     make \
     cmake \
@@ -62,6 +63,8 @@ RUN cp /usr/share/OVMF/OVMF_CODE.fd /metalos/deps/ovmf/ 2>/dev/null || \
 # Set environment variables
 ENV PATH="/metalos/tools:${PATH}"
 ENV METALOS_ROOT="/metalos"
+ENV CC=clang
+ENV CXX=clang++
 
 # Default command
 CMD ["/bin/bash"]
diff --git a/README.md b/README.md
index 3868ef9..aea37e9 100644
--- a/README.md
+++ b/README.md
@@ -67,7 +67,7 @@ See [docs/ROADMAP.md](docs/ROADMAP.md) for detailed phase breakdown.
 
 ## Building
 
-MetalOS uses **CMake** as its build system for a modern, cross-platform build experience.
+MetalOS uses **CMake** as its build system for a modern, cross-platform build experience. **Clang** is the default compiler.
 
 ### Quick Start (CMake)
 
@@ -87,13 +87,13 @@ ninja
 ninja qemu
 ```
 
-### Building with Clang
+### Building with GCC
 
-MetalOS supports both GCC and Clang compilers. To build with Clang:
+MetalOS supports both Clang (default) and GCC compilers. To build with GCC:
 
 ```bash
 mkdir build && cd build
-CC=clang CXX=clang++ cmake ..
+CC=gcc CXX=g++ cmake ..
 cmake --build .
 ```
 
@@ -101,7 +101,7 @@ Or with Ninja:
 
 ```bash
 mkdir build && cd build
-CC=clang CXX=clang++ cmake -G Ninja ..
+CC=gcc CXX=g++ cmake -G Ninja ..
 ninja
 ```