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From: "ayzhao at google dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug libc/30516] New: realpath() implementation has a C++ ODR
 violation
Date: Mon, 05 Jun 2023 21:56:05 +0000
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X-Bugzilla-Type: new
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X-Bugzilla-Product: glibc
X-Bugzilla-Component: libc
X-Bugzilla-Version: 2.39
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: ayzhao at google dot com
X-Bugzilla-Status: UNCONFIRMED
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X-Bugzilla-Priority: P2
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D30516

            Bug ID: 30516
           Summary: realpath() implementation has a C++ ODR violation
           Product: glibc
           Version: 2.39
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: ayzhao at google dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

In stdlib/bits/stdlib.h, realpath is implemented as an inline function whose
definition changes depending on whether or not limits.h was included first
before stdlib.h [0]. In C++, this leads to an ODR violation if, for example,
one translation unit includes stdlib.h and another translation unit includes
limit.h and stdlib.h.

[0]:
https://sourceware.org/git/?p=3Dglibc.git;a=3Dblob;f=3Dstdlib/bits/stdlib.h=
;h=3Dc6c0082ad5b5fe0a9714326051f19818dedd5e11;hb=3DHEAD#l44

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