call of overload 'path(json)' is ambiguous

[jiangfeng15]

Compile the source code，i get the error.

json/test/src/unit-regression2.cpp:810:68: error: call of overload 'path(json)' is ambiguous

[nlohmann]

In order to asses your issue, we need the following information:

• Which compiler and operating system are you using? Is it a supported compiler?

• Did you use a released version of the library or the version from the develop branch?

[nlohmann]

Can you please also try the develop branch?

[falbrechtskirchinger]

Just confirming this, Debian GNU/Linux 10 (buster), compiler GNU 8.3.0. Json release 3.10.5 build failed with the error below. Downgrade to 3.10.4 helped.

This was partly fixed in c2054b9 and should no longer happen on GCC.

[pcampr]

I tried develop branch (downloaded https://github.com/nlohmann/json/archive/develop.tar.gz and build from it), and got the same error (a few line numbers are different, but otherwise the same error).
I know GCC 8.4 works, but unfortunately GCC 8.3 is the default compiler on Debian 10 (Buster). So not that easy to upgrade for everyone.

[falbrechtskirchinger]

Alright, I'll take another look.

[falbrechtskirchinger]

Well, things haven't really changed. We still can't fix the underlying issue, but we can disable the test for GCC <8.4. I can whip up a PR for that.

Ignoring the test failure, is this ambiguous overload resolution a real issue for you?