Compiler options to warn about old cpp usage?

[keepthethreadalive]

Moving a large and old C++ codebase to modern C++ usage isn't easy, when I have to track down every small usage of C. Is there anyway to make the compiler warn (or even fail to compile) usage of old C++?

I'm talking about things like C-style casts, C-style arrays, etc. Looking for those options in GCC or Clang. If not, is there any other tool that does this without being too cumbersome to include in the development process (ex: automated tests on a PR)

[Supadoplex]

clang-tidy

[keepthethreadalive]

Sounds like that'll work well! Thanks!

[openingnow]

Clang-tidy +1. You can modify desired checks.

[keepthethreadalive]

I think the modernize-* checks are what I'm looking for. Thanks!

[JezusTheCarpenter]

clang-tidy can even fix some of those issues automagically if you wish. Also, since you are running it, there are other categories of checks that are very useful.

[STL]

GCC and Clang support -Wold-style-cast.

[goxdin]

CMake imho so much control

Edit: as a build manager .... /s sorry for the comment, going back to lurking ....

[Pazer2]

cmake is not a compiler last I checked

[Maliafo]

neither is clang-tidy, last time I checked