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Sep 2, 2025
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doc: Recommend clang-cl when building on Windows #1681

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doc: Recommend clang-cl when building on Windows
hebasto Aug 24, 2025
7379124
ci: Add more tests for clang-cl
hebasto Aug 24, 2025
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12 changes: 10 additions & 2 deletions .github/workflows/ci.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -604,8 +604,16 @@ jobs:
cpp_flags: '/DSECP256K1_MSVC_MULH_TEST_OVERRIDE'
- job_name: 'x86 (MSVC): Windows (VS 2022)'
cmake_options: '-A Win32'
- job_name: 'x64 (MSVC): Windows (clang-cl)'
cmake_options: '-T ClangCL'
- job_name: 'x64 (clang-cl): Windows (VS 2022, shared)'
cmake_options: '-T ClangCL -DBUILD_SHARED_LIBS=ON'
symbol_check: 'true'
- job_name: 'x64 (clang-cl): Windows (VS 2022, static)'
cmake_options: '-T ClangCL -DBUILD_SHARED_LIBS=OFF'
- job_name: 'x64 (clang-cl): Windows (VS 2022, int128_struct)'
cmake_options: '-T ClangCL -DSECP256K1_TEST_OVERRIDE_WIDE_MULTIPLY=int128_struct'
- job_name: 'x64 (clang-cl): Windows (VS 2022, int128_struct with __(u)mulh)'
cmake_options: '-T ClangCL -DSECP256K1_TEST_OVERRIDE_WIDE_MULTIPLY=int128_struct'
cpp_flags: '/DSECP256K1_MSVC_MULH_TEST_OVERRIDE'

steps:
- name: Checkout
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6 changes: 2 additions & 4 deletions README.md
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Expand Up @@ -135,13 +135,11 @@ To cross compile for Android with [NDK](https://developer.android.com/ndk/guides

### Building on Windows

To build on Windows with Visual Studio, a proper [generator](https://cmake.org/cmake/help/latest/manual/cmake-generators.7.html#visual-studio-generators) must be specified for a new build tree.

The following example assumes using of Visual Studio 2022 and CMake v3.21+.
The following example assumes Visual Studio 2022. Using clang-cl is recommended.

In "Developer Command Prompt for VS 2022":

>cmake -G "Visual Studio 17 2022" -A x64 -B build
>cmake -B build -T ClangCL
>cmake --build build --config RelWithDebInfo

Usage examples
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