[Bug nptl/21573] /usr/bin/install: cannot remove '/usr/include/stdlib.h': Permission denied

["hjl.tools at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21573

--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
commit 8321286846970af562a2ff6b7272f1cd0860d6c1
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Tue Jul 5 15:01:33 2016 -0700

    Make copies of cstdlib/cmath and use them [BZ #20314]

    If C++ headers <cstdlib> or <cmath> are used, GCC 6 will include
    /usr/include/stdlib.h or /usr/include/math.h from "#include_next"
    (instead of stdlib/stdlib.h or math/math.h in the glibc source
    directory), and this turns up as a make dependency.  An implicit
    rule will kick in and make will try to install stdlib/stdlib.h or
    math/math.h as /usr/include/stdlib.h or /usr/include/math.h because
    the target is out of date.  We make a copy of <cstdlib> and <cmath>
    in the glibc build directory so that stdlib/stdlib.h and math/math.h
    will be used instead of /usr/include/stdlib.h and /usr/include/math.h.

worked for GCC 6.  But bits/std_abs.h from GCC 7 also includes
/usr/include/stdlib.h.

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