[libc-commits] [libc] [libc][z/OS] Remove ASCII trick to fix EBDIC std::from_char (PR #116078)

[Sean Perry via libc-commits]

perry-ca wrote:

(Zibi's off for a couple days.  I'll answer in the meantime)
You don't really need to use a particular target triple.  To compile something in EBCDIC you'll need:

1. the -fexec-charset option (see https://github.com/llvm/llvm-project/pull/74516 & https://github.com/abhina-sree/llvm-project/pull/1) or #pragma convert (follow on to these)
2. A way to got through the preprocessing paths for `defined(__MVS__)` && `!defined(__NATIVE_ASCII_F)`.  This will then depend on macros or values defined in the z/OS headers (eg. `static const mask space  = __ISSPACE;`)

This would be a specific build of libc++ for EBCDIC.  We haven't tried enabling EBCDIC on other platforms.  In theory it should work. 


https://github.com/llvm/llvm-project/pull/116078