[Bug 221533] New: strstr/c23/constness

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=221533

            Bug ID: 221533
           Summary: strstr/c23/constness
           Product: Documentation
           Version: unspecified
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: man-pages
          Assignee: documentation_man-pages@kernel-bugs.osdl.org
          Reporter: linux@treblig.org
        Regression: No

Hi,
  In C23 strstr can return a const char* if the first parameter is a const
char*;  this is also true of a bunch of the other routines.

  I'm not really sure how this should be documented, I guess two entries for
each function with some note saying it's only C23 and later?

See:
https://sourceware.org/cgit/glibc/commit/string/string.h?id=cd748a63ab1a7ae846175c532a3daab341c62690

for the glibc change that implemented it.

It can break some existing code, e.g. something like:


int foo(const char *a)
{
   char *bar = strstr(a, "frog");
}

gives:
t.c:9:16: warning: initialization discards ‘const’ qualifier from pointer
target type [-Wdiscarded-qualifiers]
    9 |    char *bar = strstr(a, "frog");
      |                ^~~~~~

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