raw string literals in C

[llvmbot]

Bugzilla Link	39891
Version	trunk
OS	Linux
Reporter	LLVM Bugzilla Contributor
CC	@hfinkel,@zygoloid

Extended Description

GCC supports, as an extension, raw string literals in C

For example, R"(^((.[^[:space:]].)|())$)" is valid in C code (with GCC).

Would it be possible for Clang to also provide this as an extension.

Thank you

[zygoloid]

This appears to be an undocumented GNU C extension. (GCC supports raw string literals in -std=gnuXY modes but not in -std=cXY modes.) We should do the same.

Note that this is (technically) a non-conforming extension. For example:

#define R "foo"
const char *str = R"(bar)";

... so (like GCC) we should not enable this in our standard-conforming -std=cXY mode.

[llvmbot]

@llvm/issue-subscribers-c

Author: None (llvmbot)

| | | | --- | --- | | Bugzilla Link | [39891](https://llvm.org/bz39891) | | Version | trunk | | OS | Linux | | Reporter | LLVM Bugzilla Contributor | | CC | @hfinkel,@zygoloid |

Extended Description

GCC supports, as an extension, raw string literals in C

For example, R"(^((.[^[:space:]].)|())$)" is valid in C code (with GCC).

Would it be possible for Clang to also provide this as an extension.

Thank you

[usachev63]

I believe this is a duplicate of #85703 and this has been completed in #88265. Maybe we can close this issue now? @AaronBallman

[AaronBallman]

Good catch, yes, this is now implemented.