Dealing with warnings with -Werror set

[wet bolt]

So I generally like having my compiler give me as many warning/errors as possible, so I have -Wall -Werror -Wpedantic -Wextra set. Now, I have pedantic giving me a warning because apparently the \e escape in a string literal is not part of the C standard (though it is implemented in both GCC & Clang):

/home/chris/git/chris-monorepo/cpp/ipc-runner/server.cpp:19:11: error: use of non-standard escape character '\e' [-Werror,-Wpedantic]
   19 |   printf("\e[1;1H\e[2J");
      |           ^~

What is the best practice for allowing a particular offense? (In other languages I'm used to adding a special comment or a pragma to tell the compiler to skip the warning). I'm technically using C++ so a C++ pragma would work. I would also be ok telling the compiler to specifically skip this ONE check from the -Wpedantic set, however the compiler didn't even tell me the name of the check...

Alternatively, is there a way to write this in a spec-compliant way?

[knotty bane]

-# C @light lava @heady oracle
-# C++ @brisk mirage @light lava @heady oracle

[heady oracle]

2 options:
make your string portable?

ig you could just

constexpr char ESC = '\x1b';
printf("%c[1;1H%c[2J", ESC, ESC);

[wet bolt]

ahh

[heady oracle]

(or just inline the \x1b)

[wet bolt]

ahh, I see, so in gcc/clang \e is equivalent to 0x1b

[heady oracle]

if you wanna suppress it you'll have to like pragma GCC diagnostic push then ignore the Wpedantic and then diagnostic pop

[wet bolt]

yeah, that's easier

[heady oracle]

not so nice tbh

[wet bolt]

oh dear

but, good to know in case i have to

[heady oracle]

We love using C++ 😭

[wet bolt]

and if you want that portable across clang also, you'd need more macro magic? or does that magicaly work with clang too?

[heady oracle]

I believe clang takes the GCC pragmas as well

💀

[wet bolt]

yeah

fun

[heady oracle]

shoulda used rust fr

[wet bolt]

oh, so #pragma gcc diagnostic push is like, "take a save state of the current diagnostic settings", then you mutate the diagnostics you want via other pragmas, then pop to restore it?

that's wild

[heady oracle]

yurp

[wet bolt]

it feels like C++ has every feature I would ever want, and yet I'm not happy with the way any of them are implemented...

anyway, thanks for the help, this is what I wanted to know

[heady oracle]

so real

hop on the ocaml or rust grind 🌹

[wet bolt]

Yeah, OCaml is my favorite language