On Tue, 15 Dec 2015, David Wohlferd wrote: > Unlike top level, using basic asm within a function is deprecated. No new code > should use this feature, but should use extended asm instead. Existing code > should begin replacing such usage. Instances of affected code can be found > using -Wonly-top-basic-asm. For help making this conversion, see "How to > convert Basic asm to Extended asm."
I think the typical use of basic asm is: you want to manipulate I/O registers or other such state unknown to the compiler (not any registers the compiler might use itself), and you want to do it in a way that is maximally compatible with as many compilers as possible (hence limiting yourself to the syntax subset that's in the C++ standard, for example). Compatibility with a wide range of other compilers is the critical thing here; this is not a GCC-invented feature, and considerations for deprecating an externally defined feature are completely different from considerations for GCC-invented features. Do you have evidence that it is now unusual for compilers to support basic asm without supporting GCC-compatible extended asm, or that other compiler providers generally consider basic asm deprecated? -- Joseph S. Myers jos...@codesourcery.com
