[Bug string/25232] New: <string.h> does not enable const correctness for strchr et al. for Clang++

["fweimer at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=25232

            Bug ID: 25232
           Summary: <string.h> does not enable const correctness for
                    strchr et al. for Clang++
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: string
          Assignee: unassigned at sourceware dot org
          Reporter: fweimer at redhat dot com
                CC: jwakely.gcc at gmail dot com
  Target Milestone: ---
             Flags: security-

The asm redirect magic is currently restricted to GCC versions with
sufficiently new libstdc++:

/* Tell the caller that we provide correct C++ prototypes.  */
#if defined __cplusplus && __GNUC_PREREQ (4, 4)
# define __CORRECT_ISO_CPP_STRING_H_PROTO
#endif

Clang supports asm redirects and could use this facility as well, at least with
libstdc++.

Mailing list discussion:

https://sourceware.org/ml/libc-alpha/2019-11/msg00996.html

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