[Bug stdio/17576] New: stdin/stdout/stderr namespace

["jsm28 at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17576

            Bug ID: 17576
           Summary: stdin/stdout/stderr namespace
           Product: glibc
           Version: 2.21
            Status: NEW
          Severity: normal
          Priority: P2
         Component: stdio
          Assignee: unassigned at sourceware dot org
          Reporter: jsm28 at gcc dot gnu.org

glibc defines stdin, stdout and stderr as extern FILE * variables in libc (with
associated macros "#define stdin stdin" etc.).

As ISO C defines these as macros, they may be reserved with external linkage if
<stdio.h> is included (this isn't entirely clear), but not otherwise.  Thus (a)
internal uses of these from within libc should use the _IO_stdin etc. internal
names (some do, but not consistently) and (b) stdin, stdout, stderr should be
weak symbols.

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