[Bug nptl/20314] make[4]: *** [/usr/include/stdlib.h] Error 1

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=20314

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The branch, hjl/pr20314 has been created
        at  9be4ecc5bbecb2fdbeee0c0d7af30e94517fd5d6 (commit)

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=9be4ecc5bbecb2fdbeee0c0d7af30e94517fd5d6

commit 9be4ecc5bbecb2fdbeee0c0d7af30e94517fd5d6
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Thu Jun 30 06:56:19 2016 -0700

    Make copies of cstdlib/cmath and use them

    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    the target is out of date.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.

        [BZ #20314]
        * Makeconfig (CXXFLAGS): Prepend -I$(common-objpfx).
        * Makerules (before-compile): Add $(common-objpfx)cstdlib and
        $(common-objpfx)cmath.
        ($(common-objpfx)cstdlib): New target.
        ($(common-objpfx)cmath): Likewise.

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