lens tests fail on Debian 12 32-bit GCC 12

[neheb]

Describe the bug

run tests

To Reproduce

meson compile -C a;meson test -C a

Expected behavior

works

Desktop (please complete the following information):

• OS and version: Debian 12 x86
• Exiv2 version and source: current master
• Compiler and version: Gcc 12.2
• Compilation mode and/or compiler flags: stock

Additional context

So this is interesting. I installed clang++-21 and it runs the tests just fine. which leads me to believe this is some kind of compiler bug. I can't really figure out what the tests have in common though...

Test output here: https://gist.github.com/neheb/78223979e24d623da7b61a982e81316a

[kmilos]

So this is interesting.

All the failures seem to be for Canons w/ an extender, e.g. "+ 1.4x" or "+ 2.8x" etc.?

Another place where the decimal separator is misinterpreted depending on locale? Or some std::regex matching problem for the extender part that is specific to this version of GNU libstdc++on x86 only?

[neheb]

like I said, clang++-21 on the same platform and same libstdc++ works just fine.

I doubt it's a locale problem. std::regex is interesting. I don't know how to easily replace though.

Replacing it is needed though. std::regex is really slow on some platforms. Probably buggy too.

[kamiccolo]

like I said, clang++-21 on the same platform and same libstdc++ works just fine.

I doubt it's a locale problem. std::regex is interesting. I don't know how to easily replace though.

Replacing it is needed though. std::regex is really slow on some platforms. Probably buggy too.

Yup, I remember seeing bunch of reports some time ago complaining about buggy regex causing issues.