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For GCC trunk:

Debian package has patches (for 4.3).  Some have been forwarded upstream.  (And
have been ignored.)  [[Thomas_Schwinge|tschwinge]] is working on getting them
integrated.

  * [\[meta-bug\] bootstrap bugs for
    \*-gnu\*](http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21824)

  * [build system: gcc\_cv\_libc\_provides\_ssp and
    NATIVE\_SYSTEM\_HEADER\_DIR](http://gcc.gnu.org/ml/gcc/2008-10/msg00130.html)

  * [-fstack-protector shouldn't use TLS in freestanding
    mode](http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29838)

  * [Tool chain configuration: GNU/\* sharing stuff with
    GNU/Linux](http://gcc.gnu.org/ml/gcc/2007-11/msg00289.html)



Additionally:

  * Configure fragments that have `*linux*` cases might/should often contain
    those for us (and GNU/k*BSD) as well.

      * `libgcc/configure.ac` [might
        need](http://gcc.gnu.org/ml/gcc-patches/2008-10/msg00315.html) to be
        aligned for us to the `*linux*` cases.  As well as at the end of
        `libgcc/config.host`.  Check.

            checking whether decimal floating point is supported... no
            checking whether fixed-point is supported... no

      * `libgomp/configure.tgt`

  * [[`libmudflap`|libmudflap]].

  * [[C++]].