https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82408
Bug ID: 82408
Summary: cross-compiling for arm64 problems
Product: gcc
Version: 7.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: peter.bohning at gmx dot com
Target Milestone: ---
Hi,
I'm trying to compile gcc-7.2.0 for arm64, mostly for libstdc++ being
required by libcrypt being required by glib. Probably I'm just doing something
wrong, but nevertheless, I feel this should be far easier and cleaner.
I do not want a compiler on the target system, I cannot chroot or reboot.
It seems to me I should be able to install to whatever sysroot I choose.
I am using linaro gcc 6.3.1-20017.05-x84_64_aarch64-linux-gnu toolchain.
The first issue is no support "mode (HF)" in half.h... I changed this to be
a simple float? soft-fp/half.h ... I tried removing the soft-fp targets from
the target files for arm under the assumption that if there was a hard float,
the soft-fp was simply unnecessary. But the targets didn't seem to affect the
usage of soft-fp so eventually I just changed that mode line in half.h to
float.
Second issue, __builtin_addressof was not declared in scope, so I replaced
it with: { return
reinterpret_cast<_Tp*>(&const_cast<char&>(reinterpret_cast<const volatile char
&>(__r))); } This is in bits/move.h in libstdc++
Third issue, std/type_traits has all these "inline" definitions and they
wouldn't compile, so I removed all the "inline" qualifiers.
This recent issue though has me a bit tired and stumped, and I worry that it
was the type_traits inline removal somehow causing this problem. To start
with, there are duplicate definitions of the "new, new[], delete, delete[]
operators, and then there's this strange "expected declaration before } token"
error on include/ccomplex... I tried to find out what it was from, it might be
from sstream? I'm not sure. The error messages are just really unhelpful and
it's hard for me to imagine that gcc-7.2.0 has a missing bracket somewhere, so
I assume it's a combination of defines that aren't working but... I'm stumped
as to what to do.
Hopefully someone can help me out with this and then maybe it would be some
bug for some arm64/toolchain combination.
Thanks
Peter
PS: I also removed the "selftest" target which seemed like cross compiling
should have disabled?
