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[vcpkg manifest] Add documentation! (#13488)
* [vcpkg docs] add docs for manifest files These are just for the maintainer docs, not user docs. * [vcpkg] EBNF-ify platform expression parsing this modifies nothing about what strings are accepted or rejected, it just moves stuff around. also adds tests. * [vcpkg docs] add manifest mode example * [wip] docs for augustin also fix tabs * [vcpkg manifest] switch to using maps for features * Apply suggestions from code review * un-experimentize format-manifest * flesh out the user manifest mode docs * CRs * billy CRs * final personal pass-thru
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| Original file line number | Diff line number | Diff line change |
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| # Manifest Mode: CMake Example | ||
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| We would like to add vcpkg manifest support to an existing cmake project! | ||
| Let's create a simple project that prints the fibonacci sequence up to a certain number, | ||
| using some common dependencies. | ||
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| ## Initial Layout | ||
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| Let's create the following file layout: | ||
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| ```no-highlight | ||
| fibo/ | ||
| src/ | ||
| main.cxx | ||
| CMakeLists.txt | ||
| ``` | ||
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| And we wish to use [fmt](https://github.com/fmtlib/fmt), [range-v3](https://github.com/ericniebler/range-v3), | ||
| and [cxxopts](https://github.com/jarro2783/cxxopts). | ||
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| Let's write our `CMakeLists.txt` first: | ||
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| ```cmake | ||
| cmake_minimum_required(VERSION 3.15) | ||
| project(fibo CXX) | ||
| find_package(fmt REQUIRED) | ||
| find_package(range-v3 REQUIRED) | ||
| find_package(cxxopts REQUIRED) | ||
| add_executable(fibo src/main.cxx) | ||
| target_link_libraries(fibo | ||
| PRIVATE | ||
| fmt::fmt | ||
| range-v3::range-v3 | ||
| cxxopts::cxxopts) | ||
| ``` | ||
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| And then we should add `main.cxx`: | ||
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| ```cxx | ||
| #include <cxxopts.hpp> | ||
| #include <fmt/format.h> | ||
| #include <range/v3/view.hpp> | ||
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| namespace view = ranges::view; | ||
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| int fib(int x) { | ||
| int a = 0, b = 1; | ||
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| for (int it : view::repeat(0) | view::take(x)) { | ||
| (void)it; | ||
| int tmp = a; | ||
| a += b; | ||
| b = tmp; | ||
| } | ||
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| return a; | ||
| } | ||
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| int main(int argc, char** argv) { | ||
| cxxopts::Options options("fibo", "Print the fibonacci sequence up to a value 'n'"); | ||
| options.add_options() | ||
| ("n,value", "The value to print to", cxxopts::value<int>()->default_value("10")); | ||
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| auto result = options.parse(argc, argv); | ||
| auto n = result["value"].as<int>(); | ||
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| for (int x : view::iota(1) | view::take(n)) { | ||
| fmt::print("fib({}) = {}\n", x, fib(x)); | ||
| } | ||
| } | ||
| ``` | ||
| This is a simple project of course, but it should give us a clean project to start with. | ||
| Let's try it out! | ||
| Let's assume you have `fmt`, `range-v3`, and `cxxopts` installed with vcpkg classic mode; | ||
| then, you can just do a simple: | ||
| ```cmd | ||
| D:\src\fibo> cmake -B build -S . -DCMAKE_TOOLCHAIN_FILE=D:\src\vcpkg\scripts\buildsystems\vcpkg.cmake | ||
| -- Building for: Visual Studio 16 2019 | ||
| -- Selecting Windows SDK version 10.0.18362.0 to target Windows 10.0.19041. | ||
| -- The CXX compiler identification is MSVC 19.27.29111.0 | ||
| -- Detecting CXX compiler ABI info | ||
| -- Detecting CXX compiler ABI info - done | ||
| -- Check for working CXX compiler: C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Tools/MSVC/14.27.29110/bin/Hostx64/x64/cl.exe - skipped | ||
| -- Detecting CXX compile features | ||
| -- Detecting CXX compile features - done | ||
| -- Configuring done | ||
| -- Generating done | ||
| -- Build files have been written to: D:/src/fibo/build | ||
| D:\src\fibo> cmake --build build | ||
| Microsoft (R) Build Engine version 16.7.0+b89cb5fde for .NET Framework | ||
| Copyright (C) Microsoft Corporation. All rights reserved. | ||
| Checking Build System | ||
| Building Custom Rule D:/src/fibo/CMakeLists.txt | ||
| main.cxx | ||
| The contents of <span> are available only with C++20 or later. | ||
| fibo.vcxproj -> D:\src\fibo\build\Debug\fibo.exe | ||
| Building Custom Rule D:/src/fibo/CMakeLists.txt | ||
| ``` | ||
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| And now we can try out the `fibo` binary! | ||
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| ```cmd | ||
| D:\src\fibo> .\build\Debug\fibo.exe -n 7 | ||
| fib(1) = 1 | ||
| fib(2) = 1 | ||
| fib(3) = 2 | ||
| fib(4) = 3 | ||
| fib(5) = 5 | ||
| fib(6) = 8 | ||
| fib(7) = 13 | ||
| ``` | ||
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| it works! | ||
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| ## Converting to Manifest Mode | ||
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| We now wish to use manifest mode, so all of our dependencies are managed for us! Let's write a `vcpkg.json`: | ||
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| ```json | ||
| { | ||
| "name": "fibo", | ||
| "version-string": "0.1.0", | ||
| "dependencies": [ | ||
| "cxxopts", | ||
| "fmt", | ||
| "range-v3" | ||
| ] | ||
| } | ||
| ``` | ||
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| Let's delete the build directory and rerun the build: | ||
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| ```cmd | ||
| D:\src\fibo> rmdir /S /Q build | ||
| D:\src\fibo> cmake -B build -S . -DCMAKE_TOOLCHAIN_FILE=D:\src\vcpkg\scripts\buildsystems\vcpkg.cmake | ||
| -- Running vcpkg install | ||
| Detecting compiler hash for triplet x64-windows... | ||
| The following packages will be built and installed: | ||
| cxxopts[core]:x64-windows | ||
| fmt[core]:x64-windows | ||
| range-v3[core]:x64-windows | ||
| Starting package 1/3: cxxopts:x64-windows | ||
| Building package cxxopts[core]:x64-windows... | ||
| Using cached binary package: C:\Users\me\AppData\Local\vcpkg/archives\d2\d2d1e5302cdfefef2fd090d8eda84cc0c1fbe6f1.zip | ||
| Building package cxxopts[core]:x64-windows... done | ||
| Installing package cxxopts[core]:x64-windows... | ||
| Installing package cxxopts[core]:x64-windows... done | ||
| Elapsed time for package cxxopts:x64-windows: 50.64 ms | ||
| Starting package 2/3: fmt:x64-windows | ||
| Building package fmt[core]:x64-windows... | ||
| Using cached binary package: C:\Users\me\AppData\Local\vcpkg/archives\bf\bf00d5214e912d71414b545b241f54ef87fdf6e5.zip | ||
| Building package fmt[core]:x64-windows... done | ||
| Installing package fmt[core]:x64-windows... | ||
| Installing package fmt[core]:x64-windows... done | ||
| Elapsed time for package fmt:x64-windows: 225 ms | ||
| Starting package 3/3: range-v3:x64-windows | ||
| Building package range-v3[core]:x64-windows... | ||
| Using cached binary package: C:\Users\me\AppData\Local\vcpkg/archives\fe\fe2cdedef6953bf954e8ddca471bf3cc8d9b06d7.zip | ||
| Building package range-v3[core]:x64-windows... done | ||
| Installing package range-v3[core]:x64-windows... | ||
| Installing package range-v3[core]:x64-windows... done | ||
| Elapsed time for package range-v3:x64-windows: 1.466 s | ||
| Total elapsed time: 1.742 s | ||
| -- Running vcpkg install - done | ||
| -- Selecting Windows SDK version 10.0.18362.0 to target Windows 10.0.19041. | ||
| -- The CXX compiler identification is MSVC 19.27.29111.0 | ||
| -- Detecting CXX compiler ABI info | ||
| -- Detecting CXX compiler ABI info - done | ||
| -- Check for working CXX compiler: C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Tools/MSVC/14.27.29110/bin/Hostx64/x64/cl.exe - skipped | ||
| -- Detecting CXX compile features | ||
| -- Detecting CXX compile features - done | ||
| -- Configuring done | ||
| -- Generating done | ||
| -- Build files have been written to: D:/src/fibo/build | ||
| D:\src\fibo> cmake --build build | ||
| Microsoft (R) Build Engine version 16.7.0+b89cb5fde for .NET Framework | ||
| Copyright (C) Microsoft Corporation. All rights reserved. | ||
| Checking Build System | ||
| Building Custom Rule D:/src/fibo/CMakeLists.txt | ||
| main.cxx | ||
| The contents of <span> are available only with C++20 or later. | ||
| fibo.vcxproj -> D:\src\fibo\build\Debug\fibo.exe | ||
| Building Custom Rule D:/src/fibo/CMakeLists.txt | ||
| ``` | ||
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| You can see that with just a _single file_, we've changed over to manifests without _any_ trouble. | ||
| The build system doesn't change _at all_! We just add a `vcpkg.json` file, delete the build directory, | ||
| and reconfigure. And we're done! |
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