[bug#49019] [PATCH 0/1] gnu: Add gccgo-10.

[Efraim Flashner <efraim@flashner.co.il>]

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On Sun, Jun 13, 2021 at 09:16:53PM -0700, Sarah Morgensen via Guix-patches via wrote:
> The primary goal for adding gccgo is to bootstrap the go compiler for arches
> that aren't supported by go 1.4. I believe the major one to support here is
> powerpc64le, but I am unsure of current arch usage. A secondary goal is to
> provide a gccgo-toolchain, as gccgo may provide advantages over gc in time.
> 
> I have successfully built gccgo 9, 10 and 11 for x86-64. I additionally tested
> gcc 10 using `make check-go`. There are two minor test failures:
> 
> 1. index0-out.go, previously reported upstream [0]
> 2. pprof (TestConvertCPUProfile/TestConvertMemProfile)
> 
> (I have not yet been able to deterine whether the pprof failures are an upstream
> bug or a Guix bug. Should I send details to bug-guix?)

I wouldn't worry about the test failures.

> Finally, the regex update in [1] is implemented in CUSTOM-GCC-GCCGO rather than
> CUSTOM-GCC to avoid rebuilding 2k+ gfortran packages, and CUSTOM-GCC-GCCGO
> should be removed after the change is in master.

Makes sense

> [0] https://issues.guix.gnu.org/49010
> [1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87589
> 
> Sarah Morgensen (1):
>   gnu: Add gccgo-10.
> 
>  gnu/packages/gcc.scm | 77 ++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 77 insertions(+)
> 
> -- 
> 2.31.1
> 

I threw together a quick gccgo-toolchain package and tried using that to
build keybase and syncthing. One of the errors I came across was:
/home/efraim/go/pkg/mod/golang.org/x/sys@v0.0.0-20200922070232-aee5d888a860/unix/gccgo.go:50:
undefined reference to `gccgoRealSyscallNoError' and also
github.com/minio/sha256-simd@v0.1.1 didn't like the assembly in the
package.

It's definitely possible that I'm missing some flag to tell go that I'm
really using gccgo. Or that it should be built with binutils-gold.

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Efraim Flashner   <efraim@flashner.co.il>   אפרים פלשנר
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