Easy way to detect where the C++11/C++14 features are used in a C++ project

[a_twig]

Disable C++11/14 with a compiler flag (or use an old compiler version) and try to build the project :-P

[CJefferson]

Just this week I reported a compiler bug to clang saying it accepts the c11 keyword _thread_local in c99 mode, and there seems no set of options which will even make it warn me I'm using c11 constructs. It was closed "wontfix".

[wfunction]

The problem is the compiler can't necessarily even parse the file with an older version of the language.

[kccqzy]

Most compilers stop after encountering a certain number of errors, like 20.

[acidburn1995]

An easier way would be when you change -std=c++1y to -std=c++03 it won't compile.

[wcr3]

thanks for the ad