[1/1] package/go: bump version to 1.16

Release notes: https://golang.org/doc/go1.16

The latest Go release, version 1.16, arrives six months after Go 1.15. Most of
its changes are in the implementation of the toolchain, runtime, and libraries.

The linker changes in 1.16 extend the 1.15 improvements to all supported
architecture/OS combinations (the 1.15 performance improvements were primarily
focused on ELF-based OSes and amd64 architectures). For a representative set of
large Go programs, linking is 20-25% faster than 1.15 and requires 5-15% less
memory on average for linux/amd64, with larger improvements for other
architectures and OSes. Most binaries are also smaller as a result of more
aggressive symbol pruning.

Signed-off-by: Christian Stewart <christian@paral.in>
---
 package/go/go.hash | 2 +-
 package/go/go.mk   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

>>>>> "Christian" == Christian Stewart <christian@paral.in> writes:

 > Release notes: https://golang.org/doc/go1.16

The release notes mention changes for i386 machines without SSE support,
but you don't seem to be handling that?

On Thu, Feb 18, 2021 at 2:37 AM Peter Korsgaard <peter@korsgaard.com> wrote:
>
> >>>>> "Christian" == Christian Stewart <christian@paral.in> writes:
>
>  > Release notes: https://golang.org/doc/go1.16
>
> The release notes mention changes for i386 machines without SSE support,
> but you don't seem to be handling that?

I guess you're talking about this section:

 As announced in the Go 1.15 release notes, Go 1.16 drops support for
x87 mode compilation (GO386=387). Support for non-SSE2 processors is
now available using soft float mode (GO386=softfloat). Users running
on non-SSE2 processors should replace GO386=387 with GO386=softfloat.

We don't set GO386 so it doesn't apply.

Best,
Christian

>>>>> "Christian" == Christian Stewart <christian@paral.in> writes:

 > On Thu, Feb 18, 2021 at 2:37 AM Peter Korsgaard <peter@korsgaard.com> wrote:
 >> 
 >> >>>>> "Christian" == Christian Stewart <christian@paral.in> writes:
 >> 
 >> > Release notes: https://golang.org/doc/go1.16
 >> 
 >> The release notes mention changes for i386 machines without SSE support,
 >> but you don't seem to be handling that?

 > I guess you're talking about this section:

 >  As announced in the Go 1.15 release notes, Go 1.16 drops support for
 > x87 mode compilation (GO386=387). Support for non-SSE2 processors is
 > now available using soft float mode (GO386=softfloat). Users running
 > on non-SSE2 processors should replace GO386=387 with GO386=softfloat.

 > We don't set GO386 so it doesn't apply.

But using SSE2 presumably means that go applications built for i386 will
only run on machines with SSE2 support, so as a minimum we need to
adjust BR2_PACKAGE_HOST_GO_TARGET_ARCH_SUPPORTS to ensure go is not
available on older i386 variants?

Hi Peter,

On Fri, Feb 19, 2021 at 4:22 AM Peter Korsgaard <peter@korsgaard.com> wrote:
>  >  As announced in the Go 1.15 release notes, Go 1.16 drops support for
>  > x87 mode compilation (GO386=387). Support for non-SSE2 processors is
>  > now available using soft float mode (GO386=softfloat). Users running
>  > on non-SSE2 processors should replace GO386=387 with GO386=softfloat.
>
>  > We don't set GO386 so it doesn't apply.
>
> But using SSE2 presumably means that go applications built for i386 will
> only run on machines with SSE2 support, so as a minimum we need to
> adjust BR2_PACKAGE_HOST_GO_TARGET_ARCH_SUPPORTS to ensure go is not
> available on older i386 variants?

Better to just set GO386=softfloat for older i386 variants without SSE2.

IMO, this seems like a separate issue from the version bump.

Best regards,
Christian

>>>>> "Christian" == Christian Stewart <christian@paral.in> writes:

 > Hi Peter,
 > On Fri, Feb 19, 2021 at 4:22 AM Peter Korsgaard <peter@korsgaard.com> wrote:
 >> >  As announced in the Go 1.15 release notes, Go 1.16 drops support for
 >> > x87 mode compilation (GO386=387). Support for non-SSE2 processors is
 >> > now available using soft float mode (GO386=softfloat). Users running
 >> > on non-SSE2 processors should replace GO386=387 with GO386=softfloat.
 >> 
 >> > We don't set GO386 so it doesn't apply.
 >> 
 >> But using SSE2 presumably means that go applications built for i386 will
 >> only run on machines with SSE2 support, so as a minimum we need to
 >> adjust BR2_PACKAGE_HOST_GO_TARGET_ARCH_SUPPORTS to ensure go is not
 >> available on older i386 variants?

 > Better to just set GO386=softfloat for older i386 variants without SSE2.

 > IMO, this seems like a separate issue from the version bump.

Why? Isn't that new behaviour? If so, this should be fixed as part of
the version bump.

Hi Peter,

On Fri, Feb 19, 2021 at 4:42 AM Peter Korsgaard <peter@korsgaard.com> wrote:
>  >> > We don't set GO386 so it doesn't apply.
>  >>
>  >> But using SSE2 presumably means that go applications built for i386 will
>  >> only run on machines with SSE2 support, so as a minimum we need to
>  >> adjust BR2_PACKAGE_HOST_GO_TARGET_ARCH_SUPPORTS to ensure go is not
>  >> available on older i386 variants?
>
>  > Better to just set GO386=softfloat for older i386 variants without SSE2.
>
>  > IMO, this seems like a separate issue from the version bump.
>
> Why? Isn't that new behaviour? If so, this should be fixed as part of
> the version bump.

OK, I will submit a v2 which sets it if SSE2 is unavailable.

Defconfig:

BR2_x86_i486=y
BR2_TOOLCHAIN_BUILDROOT_GLIBC=y
BR2_PACKAGE_RUNC=y

In v2 it should set

$(if $(GO_GO386),GO386=$(GO_GO386))

# i386: use softfloat if no SSE2: https://golang.org/doc/go1.16#386
ifneq ($(BR2_X86_CPU_HAS_SSE2),y)
GO_GO386 = softfloat
endif

Best,
Christian