From 71d2eadcb92396fdc984150a9fc4504b6d8e9000 Mon Sep 17 00:00:00 2001
From: huntedbytheirs <huntedbyth3irs@gmail.com>
Date: Tue, 4 Aug 2026 14:27:13 -0400
Subject: [PATCH] fix: force clang-18 via LLVM script, prefer highest version

<llvm.sh 18 all> installs clang-18 with full C++23 support.
sort -V ensures the highest clang version is selected when
multiple are installed. Removes -stdlib=libc++ (clang-18
provides <format> via its own header, no flag needed).
---
 .gitea/workflows/ci.yml | 23 +++++------------------
 1 file changed, 5 insertions(+), 18 deletions(-)

diff --git a/.gitea/workflows/ci.yml b/.gitea/workflows/ci.yml
index 7c5b02d..32f3825 100644
--- a/.gitea/workflows/ci.yml
+++ b/.gitea/workflows/ci.yml
@@ -15,21 +15,9 @@ jobs:
       - name: Install dependencies
         run: |
           apt-get update -qq
-          # Clang needs libc++ for <format> on Ubuntu 22.04 (libstdc++ is pre-GCC-13)
-          if apt-cache show clang-18 >/dev/null 2>&1; then
-            apt-get install -y -qq clang-18 libc++-18-dev libc++abi-18-dev ninja-build curl
-          elif apt-cache show clang-17 >/dev/null 2>&1; then
-            apt-get install -y -qq clang-17 libc++-17-dev libc++abi-17-dev ninja-build curl
-          elif apt-cache show clang-16 >/dev/null 2>&1; then
-            apt-get install -y -qq clang-16 libc++-16-dev libc++abi-16-dev ninja-build curl
-          elif apt-cache show clang-15 >/dev/null 2>&1; then
-            apt-get install -y -qq clang-15 libc++-15-dev libc++abi-15-dev ninja-build curl
-          else
-            # Ubuntu 20.04: install from LLVM repo
-            apt-get install -y -qq wget lsb-release
-            wget -qO- https://apt.llvm.org/llvm.sh | bash -s -- 18
-            apt-get install -y -qq libc++-18-dev libc++abi-18-dev ninja-build curl
-          fi
+          apt-get install -y -qq wget lsb-release
+          wget -qO- https://apt.llvm.org/llvm.sh | bash -s -- 18 all
+          apt-get install -y -qq ninja-build curl
 
       - name: Install CMake 3.28
         run: |
@@ -38,14 +26,13 @@ jobs:
 
       - name: Build kappa
         run: |
-          CC=$(find /usr/bin -maxdepth 1 \( -name 'clang-1[5-9]' -o -name 'clang-2[0-9]' \) 2>/dev/null | head -1)
+          CC=$(find /usr/bin -maxdepth 1 \( -name 'clang-1[5-9]' -o -name 'clang-2[0-9]' \) 2>/dev/null | sort -V | tail -1)
           if [ -z "$CC" ]; then CC=/usr/bin/clang-18; fi
           CXX=$(echo "$CC" | sed 's/clang-/clang++-/')
           echo "CC=$CC CXX=$CXX"
           cmake -B build -G Ninja \
             -DCMAKE_C_COMPILER="$CC" \
-            -DCMAKE_CXX_COMPILER="$CXX" \
-            -DCMAKE_CXX_FLAGS="-stdlib=libc++"
+            -DCMAKE_CXX_COMPILER="$CXX"
           cmake --build build
 
       - name: DSL and CLI tests