write_demangled_name supports libc++ + clang-cl#4560
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vitaut merged 1 commit intofmtlib:masterfrom Oct 8, 2025
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@vitaut the lint/format_code task is failing but it also points out a file I did not touch. I also formatted the files locally with clang-format using the |
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The formatting issue in |
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As for the formatting issue in -auto normalize_msvc_abi_name(string_view abi_name_view,
- OutputIt out) -> OutputIt {
+auto normalize_msvc_abi_name(string_view abi_name_view, OutputIt out)
+ -> OutputIt { |
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The current implementation assumes whenever we're on an FMT_MSC_VERSION compiler, the standard library is MSVC's STL. However, with clang-cl we have the possibility of using LLVM libc++ instead of MSVC STL. In that scenario, the previous implementation produced the wrong demangled names for RTTI types. This patch detects the different combinations, and combines the existing demangling implementations to produce the correct names and make all tests pass on libc++ + clang-cl.
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Thank you for the fix! |
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| string_view normalize_libcxx_inline_namespaces(string_view demangled_name_view, | ||
| char* begin) { |
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This function should have been inline because it is defined in the header.
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# 12.1.0 - 2025-10-29 - Optimized `buffer::append`, resulting in up to ~16% improvement on spdlog benchmarks (fmtlib/fmt#4541). Thanks @fyrsta7. - Worked around an ABI incompatibility in `std::locale_ref` between clang and gcc (fmtlib/fmt#4573). - Made `std::variant` and `std::expected` formatters work with `format_as` (fmtlib/fmt#4574, fmtlib/fmt#4575). Thanks @phprus. - Made `fmt::join<string_view>` work with C++ modules (fmtlib/fmt#4379, fmtlib/fmt#4577). Thanks @Arghnews. - Exported `fmt::is_compiled_string` and `operator""_cf` from the module (fmtlib/fmt#4544). Thanks @CrackedMatter. - Fixed a compatibility issue with C++ modules in clang (fmtlib/fmt#4548). Thanks @tsarn. - Added support for cv-qualified types to the `std::optional` formatter (fmtlib/fmt#4561, fmtlib/fmt#4562). Thanks @OleksandrKvl. - Added demangling support (used in exception and `std::type_info` formatters) for libc++ and clang-cl (fmtlib/fmt#4542, fmtlib/fmt#4560, fmtlib/fmt#4568, fmtlib/fmt#4571). Thanks @FatihBAKIR and @rohitsutreja. - Switched to global `malloc`/`free` to enable allocator customization (fmtlib/fmt#4569, fmtlib/fmt#4570). Thanks @rohitsutreja. - Made the `FMT_USE_CONSTEVAL` macro configurable by users (fmtlib/fmt#4546). Thanks @SnapperTT. - Fixed compilation with locales disabled in the header-only mode (fmtlib/fmt#4550). - Fixed compilation with clang 21 and `-std=c++20` (fmtlib/fmt#4552). - Fixed a dynamic linking issue with clang-cl (fmtlib/fmt#4576, fmtlib/fmt#4584). Thanks @FatihBAKIR. - Fixed a warning suppression leakage on gcc (fmtlib/fmt#4588). Thanks @ZedThree. - Made more internal color APIs `constexpr` (fmtlib/fmt#4581). Thanks @ishani. - Fixed compatibility with clang as a host compiler for NVCC (fmtlib/fmt#4564). Thanks @valgur. - Fixed various warnings and lint issues (fmtlib/fmt#4565, fmtlib/fmt#4572, fmtlib/fmt#4557). Thanks @LiangHuDream and @teruyamato0731. - Improved documentation (fmtlib/fmt#4549, fmtlib/fmt#4551, fmtlib/fmt#4566, fmtlib/fmt#4567, fmtlib/fmt#4578,). Thanks @teruyamato0731, @petersteneteg and @zimmerman-dev.
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The current implementation assumes whenever we're on an FMT_MSC_VERSION compiler, the standard library is MSVC's STL. However, with clang-cl we have the possibility of using LLVM libc++ instead of MSVC STL. In that scenario, the previous implementation produced the wrong demangled names for RTTI types.
This patch detects the different combinations, and combines the existing demangling implementations to produce the correct names and make all tests pass on libc++ + clang-cl.
Fixes #4542