CODEWITHSUNDEEP
c++clanghomebrewmsys2
mvc
mvc

Reputation: 733

Same version of clang giving different results on different OS's

I have clang 15.0.7 installed with brew in MacOS and the same version installed with MSYS2 in Windows 10.

When I compile the following program:

#include <filesystem>

int main()
{
  std::filesystem::path p("/some/path");
  std::string s(p);
}

using clang++ -std=c++20 test.cpp I get no compilation errors on MacOS, but in windows it gives:

test.cpp:6:15 error: no matching constructor for initialization of 'std::string' (aka 'basic_string<char>')
  std::string s(p);
              ^ ~
[more errors]

What is going on?

Upvotes: 2

Views: 80

Answers (1)

HolyBlackCat
HolyBlackCat

Reputation: 96719

std::filesystem::path::value_type is wchar_t on Windows and char elsewhere.

Hence, std::filesystem::path has a conversion operator to std::wstring on Windows and to std::string elsewhere (who even thought this was a good idea?!).

Call .string() to get std::string in a "portable" manner.

On Windows, make sure to test UTF-8 support on all standard library flavors you're interested in (MSVC STL, GCC's libstdc++, Clang's libc++). I remember that at least on MSVC you had to enable UTF-8 support with a locale, or use std::u8string.

Upvotes: 5

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