[astrange]

The implicit casting rules are different, it doesn't allow VLAs, you can implicitly create static constructors instead of having your program rejected for non-constants at the top level, more keywords are unavailable as variable names…

[pjmlp]

VLAs are optional since ISO C11, clang and gcc are probably the only C compilers that care to support them.

C17 also has its share of keywords and C2X plans to replace some of the _Keyword with they keyword version, as enough time has passed since their introduction.

[saagarjha]

Clang and GCC being the two largest implementations.

[pjmlp]

True, but not the only ones, so good luck making that VLA code work outside BSD/Linux clones or the few OEM vendors that have forked them.

Also Google has sponsored the work to clean Linux kernel from VLAs.

[saagarjha]

Yeah, because VLAs mostly suck.

[astrange]

I have some perfectly safe code using them that crashes Intel icc. Useful if you ever need to, I don't know, crash icc I guess.

Among other things, this means icc doesn't run other compilers' testsuites, because I reported the same bug in the first release of clang and clattner fixed it right away.

[pjmlp]

And given that C11 made them optional, Intel can just close such bug reports with won't fix using the ISO as justification.