build: support clang-cl compiler

[dmehala]

Description

In another internal project that relies on dd-trace-cpp, I needed to enable cross-compilation for Windows from a Linux host. During this process, I used clang-cl as the compiler - MSVC frontend for clang. However, I encountered an issue where CMAKE_CXX_COMPILER_ID was detected as Clang, which caused the incorrect file to be included, leading to a compilation failure.

To address this, I utilized the CMAKE_CXX_COMPILER_FRONTEND_VARIANT variable. This change ensures that the correct compiler frontend (clang-cl) is identified, allowing for successful cross-compilation in this scenario.

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-11-15 10:35:58

Comparing candidate commit db1eefc in PR branch dmehala/win-xcomp with baseline commit bc70e5a in branch main.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 1 metrics, 0 unstable metrics.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.91%. Comparing base (bc70e5a) to head (db1eefc).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #169   +/-   ##
=======================================
  Coverage   93.91%   93.91%           
=======================================
  Files          73       73           
  Lines        4176     4176           
=======================================
  Hits         3922     3922           
  Misses        254      254           

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[pablomartinezbernardo]

Thanks for the explanation!