Bug#874583: gcc-6: Add support for arm64ilp32 triplet

[Matthias Klose <doko@debian.org>]

On 07.09.2017 17:07, Wookey wrote:
> Package: gcc-6
> Version: 6.3.0-18
> Severity: normal
> Tags: upstream patch
> 
> gcc has arm64 ILP32 support, but it only works if built as a multilib
> on arm64 architecture.  This patch allows gcc to also be configured
> for the aarch64 ILP32 triplet and build the right thing. Without it,
> gcc defaults to LP64 even when the build is configured as
> TARGET=aarch64-linux-gnu_ilp32 which is wrong.
> 
> Note that this uses the newer triplet for this ABI agreed at Linaro
> Connect (Feb 2018): aarch64-linux-gnu_ilp32, matching the change made
> in binutils.
> 
> This support is in gcc-ilp32-default-support.patch
> 
> The existing debian multiarch support patch has to be modified to
> match the right triplet and multiarch/multilib paths too. A patch for that is attached in 
> gcc-fixup-multilib-patch-for-ilp32-default.patch
> 
> That is a rather confusing patch-patch, so here is the final file that 
> should result from it (sans header):
> 
> LIB1ASMSRC   = aarch64/lib1funcs.asm
> LIB1ASMFUNCS = _aarch64_sync_cache_range
> 
> AARCH_BE = $(if $(findstring TARGET_BIG_ENDIAN_DEFAULT=1, $(tm_defines)),_be)
> ifneq (,$(findstring _ilp32,$(target)))
> MULTILIB_OSDIRNAMES = mabi.lp64=../lib64$(call if_multiarch,:aarch64$(AARCH_BE)-linux-gnu)
> MULTILIB_OSDIRNAMES += mabi.ilp32=../lib$(call if_multiarch,:aarch64$(AARCH_BE)-linux-gnu_ilp32)
> MULTIARCH_DIRNAME = $(call if_multiarch,aarch64$(AARCH_BE)-linux-gnu_ilp32)
> else
> MULTILIB_OSDIRNAMES = mabi.lp64=../lib$(call if_multiarch,:aarch64$(AARCH_BE)-linux-gnu)
> MULTILIB_OSDIRNAMES += mabi.ilp32=../libilp32$(call if_multiarch,:aarch64$(AARCH_BE)-linux-gnu_ilp32)
> MULTIARCH_DIRNAME = $(call if_multiarch,aarch64$(AARCH_BE)-linux-gnu)
> endif
> 
> These have only been tested on gcc-6, although they should work the same
> on gcc-7. I will supply separate bug/patches for gcc-7.

please do. also are all of these accepted upstream?