Compilation on Linux fails with building with clang / clang++

[etna]

Does this issue occur when all extensions are disabled?: Yes/No

• VS Code Version: Git, cloned with --branch 1.100.3 --single-branch
• OS Version: Debian 13 RC, self-built LLVM20 and clang / clang++

Steps to Reproduce:

1. Clone the VScode repo
2. Build with clang and clang++

Build fails with the following error:

npm error In file included from ../src/main.cc:8:
npm error In file included from ../src/logger.h:12:
npm error In file included from ../deps/spdlog/include/spdlog/spdlog.h:12:
npm error In file included from ../deps/spdlog/include/spdlog/common.h:50:
npm error In file included from ../deps/spdlog/include/spdlog/fmt/fmt.h:27:
npm error In file included from ../deps/spdlog/include/spdlog/fmt/bundled/core.h:3321:
npm error ../deps/spdlog/include/spdlog/fmt/bundled/format.h:4168:27: warning: identifier '_a' preceded by whitespace in a literal operator declaration is deprecated [-Wdeprecated-literal-operator]
npm error  4168 | constexpr auto operator"" _a(const char* s, size_t) -> detail::udl_arg<char> {
npm error       |                ~~~~~~~~~~~^~
npm error       |                operator""_a
npm error In file included from ../src/main.cc:8:
npm error In file included from ../src/logger.h:12:
npm error In file included from ../deps/spdlog/include/spdlog/spdlog.h:13:
npm error In file included from ../deps/spdlog/include/spdlog/details/registry.h:122:
npm error In file included from ../deps/spdlog/include/spdlog/details/registry-inl.h:12:
npm error In file included from ../deps/spdlog/include/spdlog/logger.h:426:
npm error In file included from ../deps/spdlog/include/spdlog/logger-inl.h:12:
npm error In file included from ../deps/spdlog/include/spdlog/pattern_formatter.h:127:
npm error In file included from ../deps/spdlog/include/spdlog/pattern_formatter-inl.h:10:
npm error ../deps/spdlog/include/spdlog/details/fmt_helper.h:105:54: error: call to consteval function 'fmt::basic_format_string<char, int &>::basic_format_string<FMT_COMPILE_STRING, 0>' is not a constant expression
npm error   105 |         fmt_lib::format_to(std::back_inserter(dest), SPDLOG_FMT_STRING("{:02}"), n);
npm error       |                                                      ^
npm error ../deps/spdlog/include/spdlog/common.h:54:46: note: expanded from macro 'SPDLOG_FMT_STRING'
npm error    54 | #    define SPDLOG_FMT_STRING(format_string) FMT_STRING(format_string)
npm error       |                                              ^
npm error ../deps/spdlog/include/spdlog/fmt/bundled/format.h:1772:23: note: expanded from macro 'FMT_STRING'
npm error  1772 | #define FMT_STRING(s) FMT_STRING_IMPL(s, fmt::detail::compile_string, )
npm error       |                       ^
npm error ../deps/spdlog/include/spdlog/fmt/bundled/format.h:1749:3: note: expanded from macro 'FMT_STRING_IMPL'
npm error  1749 |   [] {                                                                        \
npm error       |   ^
npm error ../deps/spdlog/include/spdlog/fmt/bundled/core.h:2982:51: note: subexpression not valid in a constant expression
npm error  2982 |     context_.advance_to(context_.begin() + (begin - &*context_.begin()));
npm error       |                                             ~~~~~~^~~~~~~~~~~~~~~~~~~~
npm error ../deps/spdlog/include/spdlog/fmt/bundled/core.h:2663:15: note: in call to 'handler.on_format_specs(0, &"{:02}"[2], &"{:02}"[5])'
npm error  2663 |       begin = handler.on_format_specs(adapter.arg_id, begin + 1, end);
npm error       |               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
npm error ../deps/spdlog/include/spdlog/fmt/bundled/core.h:2688:21: note: in call to 'parse_replacement_field<char, fmt::detail::format_string_checker<char, fmt::detail::error_handler, int> &>(&"{:02}"[1], &"{:02}"[5], checker(s, {}))'
npm error  2688 |         begin = p = parse_replacement_field(p - 1, end, handler);
npm error       |                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
npm error ../deps/spdlog/include/spdlog/fmt/bundled/core.h:3159:7: note: in call to 'parse_format_string<true, char, fmt::detail::format_string_checker<char, fmt::detail::error_handler, int>>({&"{:02}"[0], 5}, checker(s, {}))'
npm error  3159 |       detail::parse_format_string<true>(str_, checker(s, {}));
npm error       |       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
npm error ../deps/spdlog/include/spdlog/details/fmt_helper.h:105:54: note: in call to 'basic_format_string<FMT_COMPILE_STRING, 0>([] {
npm error     struct FMT_COMPILE_STRING : fmt::detail::compile_string {
npm error         using char_type [[maybe_unused]] = fmt::remove_cvref_t<decltype("{:02}"[0])>;
npm error         [[maybe_unused]] constexpr operator fmt::basic_string_view<char_type>() const {
npm error             return fmt::detail_exported::compile_string_to_view<char_type>("{:02}");
npm error         }
npm error     };
npm error     return FMT_COMPILE_STRING();
npm error }())'
npm error   105 |         fmt_lib::format_to(std::back_inserter(dest), SPDLOG_FMT_STRING("{:02}"), n);
npm error       |                                                      ^~~~~~~~~~~~~~~~~~~~~~~~~~
npm error ../deps/spdlog/include/spdlog/common.h:54:46: note: expanded from macro 'SPDLOG_FMT_STRING'
npm error    54 | #    define SPDLOG_FMT_STRING(format_string) FMT_STRING(format_string)
npm error       |                                              ^~~~~~~~~~~~~~~~~~~~~~~~~
npm error ../deps/spdlog/include/spdlog/fmt/bundled/format.h:1772:23: note: expanded from macro 'FMT_STRING'
npm error  1772 | #define FMT_STRING(s) FMT_STRING_IMPL(s, fmt::detail::compile_string, )
npm error       |                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
npm error ../deps/spdlog/include/spdlog/fmt/bundled/format.h:1749:3: note: expanded from macro 'FMT_STRING_IMPL'
npm error  1749 |   [] {                                                                        \
npm error       |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
npm error  1750 |     /* Use the hidden visibility as a workaround for a GCC bug (#1973). */    \
npm error       |     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
npm error  1751 |     /* Use a macro-like name to avoid shadowing warnings. */                  \
npm error       |     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
npm error  1752 |     struct FMT_GCC_VISIBILITY_HIDDEN FMT_COMPILE_STRING : base {              \
npm error       |     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
npm error  1753 |       using char_type FMT_MAYBE_UNUSED = fmt::remove_cvref_t<decltype(s[0])>; \
npm error       |       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
npm error  1754 |       FMT_MAYBE_UNUSED FMT_CONSTEXPR explicit                                 \
npm error       |       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
npm error  1755 |       operator fmt::basic_string_view<char_type>() const {                    \
npm error       |       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
npm error  1756 |         return fmt::detail_exported::compile_string_to_view<char_type>(s);    \
npm error       |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
npm error  1757 |       }                                                                       \
npm error       |       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
npm error  1758 |     };                                                                        \
npm error       |     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
npm error  1759 |     return FMT_COMPILE_STRING();                                              \
npm error       |     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
npm error  1760 |   }()
npm error       |   ~~~
npm error 1 warning and 1 error generated.
npm error make: *** [spdlog.target.mk:130: Release/obj.target/spdlog/src/main.o] Error 1
npm error gyp ERR! build error 
npm error gyp ERR! stack Error: `make` failed with exit code: 2
npm error gyp ERR! stack at ChildProcess.<anonymous> (/home/etna/Runtime/Deps/node-v22.15.1/lib/node_modules/npm/node_modules/node-gyp/lib/build.js:216:23)
npm error gyp ERR! System Linux 6.12.25
npm error gyp ERR! command "/home/etna/Runtime/Deps/node-v22.15.1/bin/node" "/home/etna/Runtime/Deps/node-v22.15.1/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "rebuild"
npm error gyp ERR! cwd /home/etna/BrowserCache/vscode/node_modules/@vscode/spdlog
npm error gyp ERR! node -v v22.15.1
npm error gyp ERR! node-gyp -v v11.0.0
npm error gyp ERR! not ok

Any help will be greatly appreciated. By the way, the build succeeds with GCC.

[etna]

So sorry, I got it to build with Clang by adding some CXXFLAGS as specified in the azurepipelines folder.