[Buildroot] [PATCH] package/go: go-bin host-go provider implies target support

[Buildroot] [PATCH] package/go: go-bin host-go provider implies target support

[Tom Wambold]

The BR2_PACKAGE_HOST_GO_TARGET_ARCH_SUPPORTS configuration symbol is
used to determine if we can build Go packages for the target
architecture.  Previously, this depended *only* on the
BR2_PACKAGE_HOST_GO_BOOTSTRAP_STAGE3_ARCH_SUPPORTS symbol, which is true
only if the host system can bootstrap the Go compiler.

The go-bin package makes it unnecessary to bootstrap the Go compiler.
Also, some host architectures (i.e. arm64/aarch64) don't support
bootstrapping the compiler anyway.

Add a new symbol BR2_PACKAGE_HOST_GO_BIN_TARGET_ARCH_SUPPORTS to let
BR2_PACKAGE_HOST_GO_TARGET_ARCH_SUPPORTS depend on either being
able to bootstrap the compiler *OR* using the go-bin package.  This
fixes being able to use the Go compiler to build target packages on an
arm64/aarch64 host system.
---
 package/go/Config.in.host        | 2 +-
 package/go/go-bin/Config.in.host | 5 +++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/package/go/Config.in.host b/package/go/Config.in.host
index 7e354b3298..f9b27cc4d8 100644
--- a/package/go/Config.in.host
+++ b/package/go/Config.in.host
@@ -2,7 +2,7 @@
 config BR2_PACKAGE_HOST_GO_TARGET_ARCH_SUPPORTS
 	bool
 	default y
-	depends on BR2_PACKAGE_HOST_GO_BOOTSTRAP_STAGE3_ARCH_SUPPORTS
+	depends on BR2_PACKAGE_HOST_GO_BOOTSTRAP_STAGE3_ARCH_SUPPORTS || BR2_PACKAGE_HOST_GO_BIN_TARGET_ARCH_SUPPORTS
 	# See https://go.dev/doc/install/source#environment
 	# See src/go/build/syslist.go for the list of supported architectures
 	depends on (BR2_arm && BR2_TOOLCHAIN_SUPPORTS_PIE) || BR2_aarch64 \
diff --git a/package/go/go-bin/Config.in.host b/package/go/go-bin/Config.in.host
index 6312c1b950..5fe1686fef 100644
--- a/package/go/go-bin/Config.in.host
+++ b/package/go/go-bin/Config.in.host
@@ -12,3 +12,8 @@ config BR2_PACKAGE_HOST_GO_BIN_HOST_ARCH_SUPPORTS
 	bool
 	default y
 	depends on BR2_PACKAGE_HOST_GO_BIN_HOST_ARCH != ""
+
+config BR2_PACKAGE_HOST_GO_BIN_TARGET_ARCH_SUPPORTS
+	bool
+	default y
+	depends on BR2_PACKAGE_HOST_GO_BIN_HOST_ARCH != ""
-- 
2.48.1

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[Buildroot] [PATCH v2] package/go: go-bin host-go provider implies target support

[Tom Wambold]

The BR2_PACKAGE_HOST_GO_TARGET_ARCH_SUPPORTS configuration symbol is
used to determine if we can build Go packages for the target
architecture.  Previously, this depended *only* on the
BR2_PACKAGE_HOST_GO_BOOTSTRAP_STAGE3_ARCH_SUPPORTS symbol, which is true
only if the host system can bootstrap the Go compiler.

The go-bin package makes it unnecessary to bootstrap the Go compiler.
Also, some host architectures (i.e. arm64/aarch64) don't support
bootstrapping the compiler anyway.

Add a new symbol BR2_PACKAGE_HOST_GO_BIN_TARGET_ARCH_SUPPORTS to let
BR2_PACKAGE_HOST_GO_TARGET_ARCH_SUPPORTS depend on either being
able to bootstrap the compiler *OR* using the go-bin package.  This
fixes being able to use the Go compiler to build target packages on an
arm64/aarch64 host system.

Signed-off-by: Tom Wambold <tom5760@gmail.com>

---
Changes v1 -> v2:
  - Added missing Signed-off-by
---
 package/go/Config.in.host        | 2 +-
 package/go/go-bin/Config.in.host | 5 +++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/package/go/Config.in.host b/package/go/Config.in.host
index 7e354b3298..f9b27cc4d8 100644
--- a/package/go/Config.in.host
+++ b/package/go/Config.in.host
@@ -2,7 +2,7 @@
 config BR2_PACKAGE_HOST_GO_TARGET_ARCH_SUPPORTS
 	bool
 	default y
-	depends on BR2_PACKAGE_HOST_GO_BOOTSTRAP_STAGE3_ARCH_SUPPORTS
+	depends on BR2_PACKAGE_HOST_GO_BOOTSTRAP_STAGE3_ARCH_SUPPORTS || BR2_PACKAGE_HOST_GO_BIN_TARGET_ARCH_SUPPORTS
 	# See https://go.dev/doc/install/source#environment
 	# See src/go/build/syslist.go for the list of supported architectures
 	depends on (BR2_arm && BR2_TOOLCHAIN_SUPPORTS_PIE) || BR2_aarch64 \
diff --git a/package/go/go-bin/Config.in.host b/package/go/go-bin/Config.in.host
index 6312c1b950..5fe1686fef 100644
--- a/package/go/go-bin/Config.in.host
+++ b/package/go/go-bin/Config.in.host
@@ -12,3 +12,8 @@ config BR2_PACKAGE_HOST_GO_BIN_HOST_ARCH_SUPPORTS
 	bool
 	default y
 	depends on BR2_PACKAGE_HOST_GO_BIN_HOST_ARCH != ""
+
+config BR2_PACKAGE_HOST_GO_BIN_TARGET_ARCH_SUPPORTS
+	bool
+	default y
+	depends on BR2_PACKAGE_HOST_GO_BIN_HOST_ARCH != ""
-- 
2.49.0

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Re: [Buildroot] [PATCH v2] package/go: go-bin host-go provider implies target support

[Thomas Petazzoni via buildroot]

Hello Tom,

Thanks for your patch! I must admit for this change I really would like
to have the feedback from Christian. Christian, could you review and
provide your feedback? This patch allows to use Go packages on ARM64
hosts, where the go-bootstrap1 -> go-boostrap2 -> go-bootstrap3 ->
go-src solution isn't available as go-bootstrap1 is only supported on
i386, x86-64 and arm (32-bit).

Tom: I however have a comment below.

On Mon, 31 Mar 2025 11:34:37 -0400
Tom Wambold <tom5760@gmail.com> wrote:

> The BR2_PACKAGE_HOST_GO_TARGET_ARCH_SUPPORTS configuration symbol is
> used to determine if we can build Go packages for the target
> architecture.  Previously, this depended *only* on the
> BR2_PACKAGE_HOST_GO_BOOTSTRAP_STAGE3_ARCH_SUPPORTS symbol, which is true
> only if the host system can bootstrap the Go compiler.
> 
> The go-bin package makes it unnecessary to bootstrap the Go compiler.
> Also, some host architectures (i.e. arm64/aarch64) don't support
> bootstrapping the compiler anyway.
> 
> Add a new symbol BR2_PACKAGE_HOST_GO_BIN_TARGET_ARCH_SUPPORTS to let
> BR2_PACKAGE_HOST_GO_TARGET_ARCH_SUPPORTS depend on either being
> able to bootstrap the compiler *OR* using the go-bin package.  This
> fixes being able to use the Go compiler to build target packages on an
> arm64/aarch64 host system.
> 
> Signed-off-by: Tom Wambold <tom5760@gmail.com>
> 
> ---
> Changes v1 -> v2:
>   - Added missing Signed-off-by
> ---
>  package/go/Config.in.host        | 2 +-
>  package/go/go-bin/Config.in.host | 5 +++++
>  2 files changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/package/go/Config.in.host b/package/go/Config.in.host
> index 7e354b3298..f9b27cc4d8 100644
> --- a/package/go/Config.in.host
> +++ b/package/go/Config.in.host
> @@ -2,7 +2,7 @@
>  config BR2_PACKAGE_HOST_GO_TARGET_ARCH_SUPPORTS
>  	bool
>  	default y
> -	depends on BR2_PACKAGE_HOST_GO_BOOTSTRAP_STAGE3_ARCH_SUPPORTS
> +	depends on BR2_PACKAGE_HOST_GO_BOOTSTRAP_STAGE3_ARCH_SUPPORTS || BR2_PACKAGE_HOST_GO_BIN_TARGET_ARCH_SUPPORTS
>  	# See https://go.dev/doc/install/source#environment
>  	# See src/go/build/syslist.go for the list of supported architectures
>  	depends on (BR2_arm && BR2_TOOLCHAIN_SUPPORTS_PIE) || BR2_aarch64 \
> diff --git a/package/go/go-bin/Config.in.host b/package/go/go-bin/Config.in.host
> index 6312c1b950..5fe1686fef 100644
> --- a/package/go/go-bin/Config.in.host
> +++ b/package/go/go-bin/Config.in.host
> @@ -12,3 +12,8 @@ config BR2_PACKAGE_HOST_GO_BIN_HOST_ARCH_SUPPORTS
>  	bool
>  	default y
>  	depends on BR2_PACKAGE_HOST_GO_BIN_HOST_ARCH != ""
> +
> +config BR2_PACKAGE_HOST_GO_BIN_TARGET_ARCH_SUPPORTS
> +	bool
> +	default y
> +	depends on BR2_PACKAGE_HOST_GO_BIN_HOST_ARCH != ""

I think you don't need the new
BR2_PACKAGE_HOST_GO_BIN_TARGET_ARCH_SUPPORTS, which is actually
misleading as this option doesn't represent which target architecture
are represented.

And in fact if you look at BR2_PACKAGE_HOST_GO_TARGET_ARCH_SUPPORTS
it's defined like this:

config BR2_PACKAGE_HOST_GO_TARGET_ARCH_SUPPORTS
        bool
        default y
        depends on BR2_PACKAGE_HOST_GO_BOOTSTRAP_STAGE3_ARCH_SUPPORTS
        # See https://go.dev/doc/install/source#environment
        # See src/go/build/syslist.go for the list of supported architectures
        depends on (BR2_arm && BR2_TOOLCHAIN_SUPPORTS_PIE) || BR2_aarch64 \
                || BR2_i386 || BR2_x86_64 || BR2_powerpc64le \
                || BR2_mips64 || BR2_mips64el || BR2_riscv || BR2_s390x
        depends on !BR2_ARM_CPU_ARMV4
        # MIPS R6 support in Go has not yet been developed.
        depends on !BR2_MIPS_CPU_MIPS64R6
        # Go doesn't support Risc-v 32-bit.
        depends on !BR2_RISCV_32
        # Go requires the following Risc-v General (G) features:
        depends on !BR2_riscv || (BR2_RISCV_ISA_RVI && \
                BR2_RISCV_ISA_RVM && BR2_RISCV_ISA_RVA && \
                BR2_RISCV_ISA_RVF && BR2_RISCV_ISA_RVD)

The "depends on BR2_PACKAGE_HOST_GO_BOOTSTRAP_STAGE3_ARCH_SUPPORTS"
allows to verify that we are on a host where bootstraping is possible.
And then the remaining dependencies are about making sure the target
architecture is supported.

So I think I would rather do:

config BR2_PACKAGE_HOST_GO_TARGET_ARCH_SUPPORTS
        bool
        default y
        depends on BR2_PACKAGE_HOST_GO_BOOTSTRAP_STAGE3_ARCH_SUPPORTS || BR2_PACKAGE_HOST_GO_BIN_HOST_ARCH_SUPPORTS
        # See https://go.dev/doc/install/source#environment
        # See src/go/build/syslist.go for the list of supported architectures
        depends on (BR2_arm && BR2_TOOLCHAIN_SUPPORTS_PIE) || BR2_aarch64 \
                || BR2_i386 || BR2_x86_64 || BR2_powerpc64le \
                || BR2_mips64 || BR2_mips64el || BR2_riscv || BR2_s390x
        depends on !BR2_ARM_CPU_ARMV4
        # MIPS R6 support in Go has not yet been developed.
        depends on !BR2_MIPS_CPU_MIPS64R6
        # Go doesn't support Risc-v 32-bit.
        depends on !BR2_RISCV_32
        # Go requires the following Risc-v General (G) features:
        depends on !BR2_riscv || (BR2_RISCV_ISA_RVI && \
                BR2_RISCV_ISA_RVM && BR2_RISCV_ISA_RVA && \
                BR2_RISCV_ISA_RVF && BR2_RISCV_ISA_RVD)

This basically extends the thing to say: "In order to build Go packages
for the target, we need:

1. A compiler that runs on our host: either bootstrapped, or pre-compiled (go-bin)

2. A target architecture that's supported
"

Tom, Christian, what do you think?

Best regards,

Thomas
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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Re: [Buildroot] [PATCH v2] package/go: go-bin host-go provider implies target support

[Thomas Petazzoni via buildroot]

Hello,

On Sun, 18 May 2025 14:14:52 +0200
Thomas Petazzoni <thomas.petazzoni@bootlin.com> wrote:

> This basically extends the thing to say: "In order to build Go packages
> for the target, we need:
> 
> 1. A compiler that runs on our host: either bootstrapped, or pre-compiled (go-bin)
> 
> 2. A target architecture that's supported
> "
> 
> Tom, Christian, what do you think?

FYI, I tried my proposal, and it does work: I was able to build a Go
package (tinifier) for the ARM architecture, on an ARM64 host (on which
bootstrapping Go is not possible).

Thomas
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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Re: [Buildroot] [PATCH v2] package/go: go-bin host-go provider implies target support

[Tom Wambold]

Hello Thomas:

On Sun, May 18, 2025 at 8:14 AM Thomas Petazzoni
<thomas.petazzoni@bootlin.com> wrote:
> I think you don't need the new
> BR2_PACKAGE_HOST_GO_BIN_TARGET_ARCH_SUPPORTS, which is actually
> misleading as this option doesn't represent which target architecture
> are represented.

Thanks for the feedback!  I've just sent a v3 with your suggestion.

I think originally I understood the
BR2_PACKAGE_HOST_GO_BIN_TARGET_ARCH_SUPPORTS symbol as "this can build binaries
for the host" and the BR2_PACKAGE_HOST_GO_BIN_TARGET_ARCH_SUPPORTS symbol as
saying "this can build binaries for the target".  It definitely makes sense to
remove, especially since both symbols were defined exactly the same way.

Thanks again!
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Re: [Buildroot] [PATCH v2] package/go: go-bin host-go provider implies target support

[Christian Stewart via buildroot]

Hi Tom, Thomas,

On Sun, May 18, 2025 at 5:14 AM Thomas Petazzoni
<thomas.petazzoni@bootlin.com> wrote:
>
> Hello Tom,
>
> Thanks for your patch! I must admit for this change I really would like
> to have the feedback from Christian. Christian, could you review and
> provide your feedback? This patch allows to use Go packages on ARM64
> hosts, where the go-bootstrap1 -> go-boostrap2 -> go-bootstrap3 ->
> go-src solution isn't available as go-bootstrap1 is only supported on
> i386, x86-64 and arm (32-bit).

Overall lgtm and I can test this out as well. Will have a look at it on Monday.

This one slipped through the cracks, apologies for the delay!

Best,
Christian Stewart
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Re: [Buildroot] [PATCH v2] package/go: go-bin host-go provider implies target support

[Tom Wambold]

Hello Christian:

On Sun, May 25, 2025 at 3:13 AM Christian Stewart <christian@aperture.us> wrote:
> Overall lgtm and I can test this out as well. Will have a look at it on Monday.
>
> This one slipped through the cracks, apologies for the delay!

Just a quick bump.  Any chance this could get applied soon?

Understand about delays, I forgot about this too!

Thanks again.
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Re: [Buildroot] [PATCH v2] package/go: go-bin host-go provider implies target support

[Christian Stewart via buildroot]

Hi all,



On Sat, Jul 19, 2025 at 6:12 AM Tom Wambold <tom5760@gmail.com> wrote:
>
> Hello Christian:
>
> On Sun, May 25, 2025 at 3:13 AM Christian Stewart <christian@aperture.us> wrote:
> > Overall lgtm and I can test this out as well. Will have a look at it on Monday.
> >
> > This one slipped through the cracks, apologies for the delay!
>
> Just a quick bump.  Any chance this could get applied soon?
>
> Understand about delays, I forgot about this too!

Looks good to me.

Reviewed-by: Christian Stewart <christian@aperture.us>

Thanks!

This one: https://patchwork.ozlabs.org/project/buildroot/patch/20250518153357.10003-1-tom5760@gmail.com/
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[Buildroot] [PATCH v3] package/go: go-bin host-go provider implies target support

[Tom Wambold]

The BR2_PACKAGE_HOST_GO_TARGET_ARCH_SUPPORTS configuration symbol is
used to determine if we can build Go packages for the target
architecture.  Previously, this depended *only* on the
BR2_PACKAGE_HOST_GO_BOOTSTRAP_STAGE3_ARCH_SUPPORTS symbol, which is true
only if the host system can bootstrap the Go compiler.

The go-bin package makes it unnecessary to bootstrap the Go compiler.
Also, some host architectures (i.e. arm64/aarch64) don't support
bootstrapping the compiler anyway.

Update BR2_PACKAGE_HOST_GO_TARGET_ARCH_SUPPORTS to depend on either
being able to bootstrap the compiler *OR* using the go-bin package.
This fixes being able to use the Go compiler to build target packages on
an arm64/aarch64 host system.

Signed-off-by: Tom Wambold <tom5760@gmail.com>

---
Changes v1 -> v2:
  - Added missing Signed-off-by

Changes v2 -> v3:
  - Remove new BR2_PACKAGE_HOST_GO_BIN_TARGET_ARCH_SUPPORTS symbol, and
    just re-use the HOST_ARCH_SUPPORTS symbol.  They were always the
    same value anyway.  Thanks for the feedback
    @thomas.petazzoni@bootlin.com!
---
 package/go/Config.in.host | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package/go/Config.in.host b/package/go/Config.in.host
index 7e354b3298..a42e37f90b 100644
--- a/package/go/Config.in.host
+++ b/package/go/Config.in.host
@@ -2,7 +2,7 @@
 config BR2_PACKAGE_HOST_GO_TARGET_ARCH_SUPPORTS
 	bool
 	default y
-	depends on BR2_PACKAGE_HOST_GO_BOOTSTRAP_STAGE3_ARCH_SUPPORTS
+	depends on BR2_PACKAGE_HOST_GO_BOOTSTRAP_STAGE3_ARCH_SUPPORTS || BR2_PACKAGE_HOST_GO_BIN_HOST_ARCH_SUPPORTS
 	# See https://go.dev/doc/install/source#environment
 	# See src/go/build/syslist.go for the list of supported architectures
 	depends on (BR2_arm && BR2_TOOLCHAIN_SUPPORTS_PIE) || BR2_aarch64 \
-- 
2.49.0

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