[crosstool-ng/crosstool-ng] 52203d: Fix sh4-unknown-linux-gnu sample.

[Bryan Hundven <bryanhundven at gmail dot com>]

  Branch: refs/heads/master
  Home:   https://github.com/crosstool-ng/crosstool-ng
  Commit: 52203df900d210b4c3d8741c5e1f61995e8bcc90
      https://github.com/crosstool-ng/crosstool-ng/commit/52203df900d210b4c3d8741c5e1f61995e8bcc90
  Author: Alexey Neyman <stilor@att.net>
  Date:   2015-10-15 (Thu, 15 Oct 2015)

  Changed paths:
    M samples/sh4-unknown-linux-gnu/crosstool.config

  Log Message:
  -----------
  Fix sh4-unknown-linux-gnu sample.

The issue with this sample is that the sh4-* targets in GCC do not
implement __builtin_trap() function. Starting with release 5.1,
GCC inserts abort() calls where NULL pointers are dereferenced. The
elf/dl-conflict.c in glibc is one such place: it calls elf_machine_rela
with NULL `sym' pointer. This causes an undefined `abort' symbol to
appear in the object file and as a result, pulls in some files during
the linking of the dynamic loader that are not supposed to. Eventually,
it results in link error due to multiple definitions of _itoa and some
other symbols.

The right fix would be to implement __builtin_trap() for sh4 in GCC.
A workaround would be adding -fno-delete-null-pointer-checks to
CFLAGS-dl-conflict.c in elf/Makefile. Until either of these happens,
though, pin the GCC version to 4.9.3 - the last that did not generate
`abort' calls. Note that the version where GCC started to generate
`abort' calls is apparently different for different architectures;
the issue in [1] was reported against GCC 4.9.

References:
[1] https://www.sourceware.org/ml/libc-alpha/2014-10/msg00807.html
  (similar issue on HP-PA which was resolved by implementing
  __builtin_trap)


  Commit: 1b29d4e8f649b121372fe25919e881a87f15e5bd
      https://github.com/crosstool-ng/crosstool-ng/commit/1b29d4e8f649b121372fe25919e881a87f15e5bd
  Author: Bryan Hundven <bryanhundven@gmail.com>
  Date:   2015-10-19 (Mon, 19 Oct 2015)

  Changed paths:
    M samples/sh4-unknown-linux-gnu/crosstool.config

  Log Message:
  -----------
  Merge pull request #196 from stilor/sh4-fix-abort

Restore sh4-unknown-linux-gnu sample.


Compare: https://github.com/crosstool-ng/crosstool-ng/compare/8433e9914d33...1b29d4e8f649

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