Clang mingw64 might somehow expands EXPECT_EQ as constexpr. I suspect that its result as "constexpr call consteval"

[denchat]

It seems EXPECT_EQ somehow expand into constexpr calling test_format<> which is consteval, so it triggers errors.

Perhaps this might be a bug in mingw64 or clang, not fmtlib.
However, anyone has any workaround suggested?

C:\Users\User\AppData\Roaming\fmt>cmake -G Ninja -DCMAKE_BUILD_TYPE=Release -DCMAKE_MAKE_PROGRAM="C:/Program Files (x86)/Ninja/ninja.exe" -DCMAKE_SYSTEM_NAME=Windows -DCMAKE_CXX_STANDARD=23 -DCMAKE_CXX_COMPILER="C:/Program Files/LLVM/bin/clang++.exe" -DCMAKE_CXX_FLAGS="-fuse-ld=lld --target=x86_64-w64-windows-gnu --driver-mode=g++ -O3 -std=gnu++2b -static-libgcc -static-libstdc++ -fconstexpr-backtrace-limit=0 -lwinpthread -DFMT_COMPILE_TIME_CHECKS=0 -DNDEBUG -D_CRT_SECURE_NO_WARNINGS -D_CRT_NONSTDC_NO_WARNINGS -D_CRT_STDIO_ISO_WIDE_SPECIFIERS -Wno-unused-command-line-argument" -DCMAKE_CXX_LINK_EXECUTABLE="C:/Program Files/LLVM/bin/lld.exe" -DBUILD_SHARED_LIBS=YES -DFMT_INSTALL=NO -DFMT_DOC=NO -DFMT_TEST=YES "C:/Users/User/AppData/Roaming/fmt-master"
-- CMake version: 3.20.0
-- The CXX compiler identification is Clang 12.0.4
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: C:/Program Files/LLVM/bin/clang++.exe - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Version: 7.1.3
-- Build type: Release
-- CXX_STANDARD: 23
-- Performing Test SUPPORTS_USER_DEFINED_LITERALS
-- Performing Test SUPPORTS_USER_DEFINED_LITERALS - Success
-- Performing Test FMT_HAS_VARIANT
-- Performing Test FMT_HAS_VARIANT - Success
-- Required features: cxx_variadic_templates
-- Performing Test HAS_NULLPTR_WARNING
-- Performing Test HAS_NULLPTR_WARNING - Success
-- Looking for _strtod_l
-- Looking for _strtod_l - found
-- Performing Test FMT_HAS_MBIG_OBJ
-- Performing Test FMT_HAS_MBIG_OBJ - Failed
-- Looking for C++ include pthread.h
-- Looking for C++ include pthread.h - found
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Success
-- Found Threads: TRUE
-- Performing Test HAVE_FNO_DELETE_NULL_POINTER_CHECKS
-- Performing Test HAVE_FNO_DELETE_NULL_POINTER_CHECKS - Success
-- FMT_PEDANTIC: OFF
-- Configuring done
-- Generating done
-- Build files have been written to: C:/Users/User/AppData/Roaming/fmt

C:\Users\User\AppData\Roaming\fmt>ninja -j 2
[14/51] Building CXX object test/CMakeFiles/compile-test.dir/compile-test.cc.obj
FAILED: test/CMakeFiles/compile-test.dir/compile-test.cc.obj
C:\PROGRA~1\LLVM\bin\CLANG_~1.EXE -DFMT_LOCALE -DFMT_SHARED -DGTEST_HAS_STD_WSTRING=1 -DGTEST_LANG_CXX11=1 -D_SILENCE_TR1_NAMESPACE_DEPRECATION_WARNING=1 -IC:/Users/User/AppData/Roaming/fmt-master/include -isystem C:/Users/User/AppData/Roaming/fmt-master/test/gtest -isystem C:/Users/User/AppData/Roaming/fmt-master/test/gmock -isystem C:/Users/User/AppData/Roaming/fmt-master/test/. -fuse-ld=lld --target=x86_64-w64-windows-gnu --driver-mode=g++ -O3 -std=gnu++2b -static-libgcc -static-libstdc++ -fconstexpr-backtrace-limit=0 -lwinpthread -DFMT_COMPILE_TIME_CHECKS=0 -DNDEBUG -D_CRT_SECURE_NO_WARNINGS -D_CRT_NONSTDC_NO_WARNINGS -D_CRT_STDIO_ISO_WIDE_SPECIFIERS -Wno-unused-command-line-argument -O3 -DNDEBUG -fno-delete-null-pointer-checks -std=gnu++2b -MD -MT test/CMakeFiles/compile-test.dir/compile-test.cc.obj -MF test\CMakeFiles\compile-test.dir\compile-test.cc.obj.d -o test/CMakeFiles/compile-test.dir/compile-test.cc.obj -c C:/Users/User/AppData/Roaming/fmt-master/test/compile-test.cc
C:/Users/User/AppData/Roaming/fmt-master/test/compile-test.cc:342:22: error: call to consteval function 'test_format<6, char, bool, FMT_COMPILE_STRING>' is not a constant expression
  EXPECT_EQ("true ", test_format<6>(FMT_COMPILE("{:5}"), true));
                     ^
C:/Users/User/AppData/Roaming/fmt-master/include\fmt/format.h:1566:36: note: initializer of 'left_padding_shifts' is unknown
  size_t left_padding = padding >> shifts[specs.align];
                                   ^
C:/Users/User/AppData/Roaming/fmt-master/include\fmt/format.h:1790:10: note: in call to 'write_padded(&string.buffer._M_elems[0], specs, 4, 4, [=](reserve_iterator<char *> it) {
    return copy_str<char>(data, data + size, it);
})'
  return write_padded(out, specs, size, width,
         ^
C:/Users/User/AppData/Roaming/fmt-master/include\fmt/format.h:2250:12: note: in call to 'write(&string.buffer._M_elems[0], {&"true"[0], 4}, specs)'
    out_ = detail::write(out_, s, specs);
           ^
C:/Users/User/AppData/Roaming/fmt-master/include\fmt/format.h:2291:5: note: in call to '&af(ctx, specs)->write({&"true"[0], 4}, specs)'
    write(string_view(value ? "true" : "false"), specs_);
    ^
C:/Users/User/AppData/Roaming/fmt-master/include\fmt/format.h:2323:5: note: in call to '&af(ctx, specs)->write(true)'
    write(value != 0);
    ^
C:/Users/User/AppData/Roaming/fmt-master/include\fmt/core.h:1377:12: note: in call to '&af(ctx, specs)->operator()(true)'
    return vis(arg.value_.bool_value);
           ^
C:/Users/User/AppData/Roaming/fmt-master/include\fmt/format.h:3531:12: note: in call to 'visit_format_arg(af(ctx, specs), detail::make_arg<fmt::basic_format_context<char *, char>>(val))'
    return visit_format_arg(af(ctx, specs),
           ^
C:/Users/User/AppData/Roaming/fmt-master/include\fmt/compile.h:599:16: note: in call to '&compiled.fmt->format(true, ctx)'
    return fmt.format(arg, ctx);
               ^
C:/Users/User/AppData/Roaming/fmt-master/include\fmt/compile.h:836:13: note: in call to '&compiled->format(&string.buffer._M_elems[0], true)'
  return cf.format(out, args...);
            ^
C:/Users/User/AppData/Roaming/fmt-master/include\fmt/compile.h:907:12: note: in call to 'format_to(&string.buffer._M_elems[0], compiled, true)'
    return format_to(out, compiled, std::forward<Args>(args)...);
           ^
C:/Users/User/AppData/Roaming/fmt-master/test/compile-test.cc:335:3: note: in call to 'format_to(&string.buffer._M_elems[0], format, true)'
  fmt::format_to(string.buffer.data(), format, args...);
  ^
C:/Users/User/AppData/Roaming/fmt-master/test/compile-test.cc:342:22: note: in call to 'test_format({{}}, true)'
  EXPECT_EQ("true ", test_format<6>(FMT_COMPILE("{:5}"), true));
                     ^
C:/Users/User/AppData/Roaming/fmt-master/include\fmt/format.h:979:31: note: declared here
  static constexpr const char left_padding_shifts[5] = {31, 31, 0, 1, 0};
                              ^

[vitaut]

Do you have a godbolt repo? I tried to make one in https://compiler-explorer.com/z/aW9WPKjdj but it didn't give an error.

[denchat]

I have no idea either.
I suspect it might be a clang 12 bug on win32 somehow.
I will try r399163b (11.0.5) then will report back.
https://android.googlesource.com/platform/prebuilts/clang/host/windows-x86/+/refs/heads/master/

[denchat]

Even with gmock, clang on CE seems okey
https://compiler-explorer.com/z/98nTz5bs6

[denchat]

No luck!
Clang 11 seems to has problems on its own.

C:\Users\User\AppData\Roaming\fmt>cmake -G Ninja -DCMAKE_BUILD_TYPE=Release -DCMAKE_MAKE_PROGRAM="C:/Program Files (x86)/Ninja/ninja.exe" -DCMAKE_SYSTEM_NAME=Windows -DCMAKE_CXX_STANDARD=23 -DCMAKE_CXX_COMPILER="C:/Program Files/LLVM/bin/clang++.exe" -DCMAKE_CXX_FLAGS="-fuse-ld=lld --target=x86_64-w64-windows-gnu --driver-mode=g++ -O3 -std=gnu++2b -static-libgcc -static-libstdc++ -fconstexpr-backtrace-limit=0 -lwinpthread -DNDEBUG -D_CRT_SECURE_NO_WARNINGS -D_CRT_NONSTDC_NO_WARNINGS -D_CRT_STDIO_ISO_WIDE_SPECIFIERS -Wno-unused-command-line-argument" -DCMAKE_CXX_LINK_EXECUTABLE="C:/Program Files/LLVM/bin/lld.exe" -DBUILD_SHARED_LIBS=YES -DFMT_INSTALL=NO -DFMT_DOC=NO -DFMT_TEST=YES "C:/Users/User/AppData/Roaming/fmt-master"
-- CMake version: 3.20.0
-- The CXX compiler identification is Clang 11.0.5
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: C:/Program Files/LLVM/bin/clang++.exe - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Version: 7.1.3
-- Build type: Release
-- CXX_STANDARD: 23
-- Performing Test SUPPORTS_USER_DEFINED_LITERALS
-- Performing Test SUPPORTS_USER_DEFINED_LITERALS - Success
-- Performing Test FMT_HAS_VARIANT
-- Performing Test FMT_HAS_VARIANT - Success
-- Required features: cxx_variadic_templates
-- Performing Test HAS_NULLPTR_WARNING
-- Performing Test HAS_NULLPTR_WARNING - Success
-- Looking for _strtod_l
-- Looking for _strtod_l - found
-- Performing Test FMT_HAS_MBIG_OBJ
-- Performing Test FMT_HAS_MBIG_OBJ - Failed
-- Looking for C++ include pthread.h
-- Looking for C++ include pthread.h - found
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Success
-- Found Threads: TRUE
-- Performing Test HAVE_FNO_DELETE_NULL_POINTER_CHECKS
-- Performing Test HAVE_FNO_DELETE_NULL_POINTER_CHECKS - Success
-- FMT_PEDANTIC: OFF
-- Configuring done
-- Generating done
-- Build files have been written to: C:/Users/User/AppData/Roaming/fmt

C:\Users\User\AppData\Roaming\fmt>ninja -j 2
[6/51] Building CXX object CMakeFiles/fmt.dir/src/format.cc.obj
C:/Users/User/AppData/Roaming/fmt-master/src/format.cc:58:17: warning: 'dllexport' attribute ignored on explicit instantiation definition [-Wignored-attributes]
template struct FMT_INSTANTIATION_DEF_API detail::basic_data<void>;
                ^
C:/Users/User/AppData/Roaming/fmt-master/include\fmt/core.h:228:37: note: expanded from macro 'FMT_INSTANTIATION_DEF_API'
#  define FMT_INSTANTIATION_DEF_API FMT_API
                                    ^
C:/Users/User/AppData/Roaming/fmt-master/include\fmt/core.h:210:32: note: expanded from macro 'FMT_API'
#    define FMT_API __declspec(dllexport)
                               ^
1 warning generated.
[8/51] Linking CXX shared library bin\libfmt.dll
FAILED: bin/libfmt.dll libfmt.dll.a
cmd.exe /C "cd . && C:\PROGRA~1\LLVM\bin\CLANG_~1.EXE -fuse-ld=lld --target=x86_64-w64-windows-gnu --driver-mode=g++ -O3 -std=gnu++2b -static-libgcc -static-libstdc++ -fconstexpr-backtrace-limit=0 -lwinpthread -DNDEBUG -D_CRT_SECURE_NO_WARNINGS -D_CRT_NONSTDC_NO_WARNINGS -D_CRT_STDIO_ISO_WIDE_SPECIFIERS -Wno-unused-command-line-argument -O3 -DNDEBUG   -shared -o bin\libfmt.dll -Wl,--out-implib,libfmt.dll.a -Wl,--major-image-version,7,--minor-image-version,1 CMakeFiles/fmt.dir/src/format.cc.obj CMakeFiles/fmt.dir/src/os.cc.obj  -lkernel32 -luser32 -lgdi32 -lwinspool -lshell32 -lole32 -loleaut32 -luuid -lcomdlg32 -ladvapi32 && cd ."
lld-link: error: duplicate symbol: typeinfo name for std::exception
>>> defined at CMakeFiles/fmt.dir/src/format.cc.obj
>>> defined at libstdc++.a(eh_alloc.o)

lld-link: error: duplicate symbol: typeinfo name for std::exception
>>> defined at CMakeFiles/fmt.dir/src/format.cc.obj
>>> defined at libstdc++.a(eh_personality.o)

lld-link: error: duplicate symbol: typeinfo name for std::exception
>>> defined at CMakeFiles/fmt.dir/src/format.cc.obj
>>> defined at libstdc++.a(new_op.o)

lld-link: error: duplicate symbol: typeinfo name for std::exception
>>> defined at CMakeFiles/fmt.dir/src/format.cc.obj
>>> defined at libstdc++.a(locale.o)

lld-link: error: duplicate symbol: typeinfo name for std::exception
>>> defined at CMakeFiles/fmt.dir/src/format.cc.obj
>>> defined at libstdc++.a(locale_init.o)

lld-link: error: duplicate symbol: typeinfo name for std::exception
>>> defined at CMakeFiles/fmt.dir/src/format.cc.obj
>>> defined at libstdc++.a(stdexcept.o)

lld-link: error: duplicate symbol: typeinfo name for std::runtime_error
>>> defined at CMakeFiles/fmt.dir/src/format.cc.obj
>>> defined at libstdc++.a(stdexcept.o)

lld-link: error: duplicate symbol: typeinfo for std::runtime_error
>>> defined at CMakeFiles/fmt.dir/src/format.cc.obj
>>> defined at libstdc++.a(stdexcept.o)

lld-link: error: duplicate symbol: typeinfo for std::runtime_error
>>> defined at CMakeFiles/fmt.dir/src/format.cc.obj
>>> defined at libstdc++.a(functexcept.o)

lld-link: error: duplicate symbol: typeinfo name for std::exception
>>> defined at CMakeFiles/fmt.dir/src/format.cc.obj
>>> defined at libstdc++.a(functexcept.o)

lld-link: error: duplicate symbol: typeinfo name for std::runtime_error
>>> defined at CMakeFiles/fmt.dir/src/format.cc.obj
>>> defined at libstdc++.a(functexcept.o)

lld-link: error: duplicate symbol: typeinfo name for std::exception
>>> defined at CMakeFiles/fmt.dir/src/format.cc.obj
>>> defined at libstdc++.a(eh_exception.o)

lld-link: error: duplicate symbol: typeinfo name for std::exception
>>> defined at CMakeFiles/fmt.dir/src/format.cc.obj
>>> defined at libstdc++.a(vterminate.o)

lld-link: error: duplicate symbol: typeinfo name for std::exception
>>> defined at CMakeFiles/fmt.dir/src/format.cc.obj
>>> defined at libstdc++.a(bad_alloc.o)

lld-link: error: duplicate symbol: typeinfo name for std::exception
>>> defined at CMakeFiles/fmt.dir/src/format.cc.obj
>>> defined at libstdc++.a(guard.o)

lld-link: error: duplicate symbol: typeinfo name for std::exception
>>> defined at CMakeFiles/fmt.dir/src/format.cc.obj
>>> defined at libstdc++.a(eh_aux_runtime.o)

lld-link: error: duplicate symbol: typeinfo name for std::exception
>>> defined at CMakeFiles/fmt.dir/src/format.cc.obj
>>> defined at libstdc++.a(bad_array_new.o)

lld-link: error: duplicate symbol: typeinfo name for std::exception
>>> defined at CMakeFiles/fmt.dir/src/format.cc.obj
>>> defined at libstdc++.a(bad_cast.o)

lld-link: error: duplicate symbol: typeinfo name for std::exception
>>> defined at CMakeFiles/fmt.dir/src/format.cc.obj
>>> defined at libstdc++.a(bad_typeid.o)
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
[9/51] Building CXX object test/CMakeFiles/args-test.dir/args-test.cc.obj
ninja: build stopped: subcommand failed.

So you may close this.
It is likely a platform's problem, not the fmtlib.

[vitaut]

Closing then.

BTW this looks very weird too:

-- CXX_STANDARD: 23