On Fri, 12 Jan 2018, Rainer Orth wrote: > At the same time, I had a new look at when values-Xc.o is used by the > Studio compilers. It selects strict ISO C mode in a couple of cases, > and the latest Studio 12.6 cc, which is about to do away with the > previous -Xc option which enabled that mode in favour of gcc-compatible > -pedantic, uses the latter to control its use. So I've changed gcc to > follow suit.
gcc -pedantic is only ever a diagnostic option, not a semantic one; it's incorrect to use it to change library semantics. The relevant options for strict ISO C (and C++) modes are -ansi, -std=c*, -std=iso9899:199409 and aliases for those options. -ansi is not defined as a .opt alias of -std=c90 (because the option it's an alias for depends on whether C or C++ is being compiled), so I'd expect the specs to need to handle it along with -std=c90. I'd also expect -std=iso9899:199409 to need to be handled there, supposing handling it like -std=c90 is correct. And what about C++ versions not based on C99 or later? -- Joseph S. Myers jos...@codesourcery.com
