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Add modules CI for building the modules
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‎.github/workflows/modules-ci.yml‎

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name: C++20 Modules CI
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on: [push, workflow_dispatch, pull_request]
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env:
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# Enable verbose output for CMake and tests
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VERBOSE: 1
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CTEST_OUTPUT_ON_FAILURE: 1
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jobs:
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ubuntu-clang-modules:
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strategy:
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matrix:
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buildType: [Debug, Release]
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runs-on: ubuntu-latest
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steps:
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- name: Update package list
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run: sudo apt update
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- name: Install Dependencies
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run: |
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sudo apt install -y git libssl-dev build-essential libcurl4-openssl-dev libpsl-dev meson libunistring-dev ninja-build wget
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# Install Clang 21+
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wget https://apt.llvm.org/llvm.sh
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chmod +x llvm.sh
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sudo ./llvm.sh 21
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sudo apt install -y libc++-21-dev libc++abi-21-dev
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env:
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DEBIAN_FRONTEND: noninteractive
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- name: Install CMake 3.28+
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run: |
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wget -O cmake.sh https://github.com/Kitware/CMake/releases/download/v3.28.3/cmake-3.28.3-linux-x86_64.sh
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sudo sh cmake.sh --prefix=/usr/local --skip-license
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cmake --version
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- name: Checkout
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uses: actions/checkout@v5
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- name: Configure
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run: |
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cmake -S . -B build \
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-DCMAKE_BUILD_TYPE=${{ matrix.buildType }} \
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-DCMAKE_CXX_COMPILER=clang++-21 \
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-DCMAKE_C_COMPILER=clang-21 \
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-DCPR_BUILD_MODULES=ON \
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-DCPR_BUILD_TESTS=ON \
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-DCPR_BUILD_TESTS_SSL=ON \
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-DCPR_FORCE_OPENSSL_BACKEND=ON \
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-DCPR_USE_SYSTEM_CURL=OFF \
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-G Ninja
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- name: Build
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run: cmake --build build --verbose
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- name: Test
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run: ctest --test-dir build --output-on-failure --repeat until-pass:5
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- name: Verify Module Build
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run: |
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echo "Contents of build/modules:"
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ls -la build/modules/
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if [ -f build/modules/libcpr_module.a ] || [ -f build/modules/libcpr_module.so ] || [ -f build/modules/cpr_module.a ] || find build/modules -name "*cpr_module*" -type f | grep -q .; then
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echo "Module library built successfully"
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else
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echo "Error: Module library not found"
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exit 1
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fi
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fedora-gcc-modules:
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runs-on: ubuntu-latest
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container: "fedora:latest"
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steps:
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- name: Update package list
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run: dnf update -y
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- name: Install Dependencies
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run: dnf install -y gcc g++ git make openssl-devel libcurl-devel cmake libpsl-devel libunistring-devel meson ninja-build
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- name: Checkout
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uses: actions/checkout@v5
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- name: Configure
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run: |
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cmake -S . -B build \
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-DCMAKE_BUILD_TYPE=Release \
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-DCPR_BUILD_MODULES=ON \
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-DCPR_BUILD_TESTS=ON \
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-DCPR_BUILD_TESTS_SSL=ON \
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-DCPR_FORCE_OPENSSL_BACKEND=ON \
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-DCPR_USE_SYSTEM_CURL=OFF \
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-G Ninja
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- name: Build
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run: cmake --build build --verbose
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- name: Test
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run: ctest --test-dir build --output-on-failure --repeat until-pass:5
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- name: Verify Module Build
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run: |
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echo "Searching for module build artifacts:"
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find build -name "*cpr_module*" -type f || true
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find build -name "cpr.gcm" -type f || true
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# GCC stores the compiled module interface (BMI) as cpr.gcm rather than
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# a traditional archive when all sources are in FILE_SET CXX_MODULES.
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# Also check build/lib/ in case LIBRARY_OUTPUT_PATH redirected the archive.
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if find build \( -name "*cpr_module*" -o -name "cpr.gcm" \) -type f | grep -q .; then
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echo "Module build artifacts found successfully"
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else
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echo "Error: No module build artifacts found"
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exit 1
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fi
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windows-msvc-modules:
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runs-on: windows-latest
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steps:
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- uses: actions/setup-python@v6
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- name: Install meson
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run: pip install meson
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- name: Setup MSVC environment
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uses: ilammy/msvc-dev-cmd@v1
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- name: Checkout
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uses: actions/checkout@v5
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- name: Install dependencies via vcpkg
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run: |
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vcpkg install curl zlib openssl --triplet x64-windows
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shell: pwsh
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- name: Configure
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run: |
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cmake -S . -B build `
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-DCMAKE_BUILD_TYPE=Release `
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-DCMAKE_TOOLCHAIN_FILE="C:/vcpkg/scripts/buildsystems/vcpkg.cmake" `
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-DVCPKG_TARGET_TRIPLET=x64-windows `
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-DCPR_BUILD_MODULES=ON `
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-DCPR_BUILD_TESTS=ON `
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-DCPR_BUILD_TESTS_SSL=OFF `
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-DCPR_USE_SYSTEM_CURL=ON `
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-G "Visual Studio 17 2022"
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shell: pwsh
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- name: Build
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run: cmake --build build --config Release --verbose
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- name: Test
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run: ctest --test-dir build -C Release --output-on-failure --repeat until-pass:5
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- name: Verify Module Build
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run: |
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Write-Host "Contents of build/modules/Release:"
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Get-ChildItem -Path build/modules/Release -Force
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if (!(Test-Path "build/modules/Release/cpr_module.lib") -and !(Get-ChildItem -Path build/modules -Recurse -Filter "*cpr_module*")) {
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throw "Module library not found"
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}
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Write-Host "Module library built successfully"
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shell: pwsh
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macos-clang-modules:
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runs-on: macos-latest
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steps:
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- name: Install Dependencies
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run: |
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brew install llvm libpsl ninja
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- name: Checkout
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uses: actions/checkout@v5
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- name: Configure
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run: |
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cmake -S . -B build \
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-DCMAKE_BUILD_TYPE=Release \
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-DCMAKE_CXX_COMPILER=$(brew --prefix llvm)/bin/clang++ \
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-DCMAKE_C_COMPILER=$(brew --prefix llvm)/bin/clang \
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-DCPR_BUILD_MODULES=ON \
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-DCPR_BUILD_TESTS=ON \
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-DCPR_BUILD_TESTS_SSL=OFF \
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-DCPR_USE_SYSTEM_LIB_PSL=ON \
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-G Ninja
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- name: Build
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run: cmake --build build --verbose
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- name: Test
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run: ctest --test-dir build --output-on-failure --repeat until-pass:5
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- name: Verify Module Build
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run: |
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echo "Contents of build/modules:"
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ls -la build/modules/
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if [ -f build/modules/libcpr_module.a ] || [ -f build/modules/libcpr_module.dylib ] || [ -f build/modules/cpr_module.a ] || find build/modules -name "*cpr_module*" -type f | grep -q .; then
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echo "Module library built successfully"
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else
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echo "Error: Module library not found"
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exit 1
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fi

‎modules/CMakeLists.txt‎

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cmake_minimum_required(VERSION 3.28)
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# Apple Clang does not ship clang-scan-deps, which CMake requires for module
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# dependency scanning. Use LLVM clang (e.g. from Homebrew) instead.
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if(CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang")
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message(FATAL_ERROR
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"Apple Clang does not support C++20 module dependency scanning.\n"
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"Use LLVM clang (e.g. 'brew install llvm') and pass "
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"-DCMAKE_CXX_COMPILER=$(brew --prefix llvm)/bin/clang++ to CMake.")
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endif()
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# GCC gained module scanning support in version 14.
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if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU" AND
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CMAKE_CXX_COMPILER_VERSION VERSION_LESS "14")
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message(FATAL_ERROR
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"C++20 module scanning requires GCC 14 or later "
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"(found ${CMAKE_CXX_COMPILER_VERSION}).")
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endif()
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set(CMAKE_CXX_SCAN_FOR_MODULES ON)
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add_library(cpr_module)
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target_sources(cpr_module

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