Re: [Xen-devel] [PATCH RFC] tools/xenlight: Create xenlight Makefile

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Mon, Nov 28, 2016 at 12:18:03PM -0500, Ronald Rojas wrote:
> Created basic Makfele for the Golang xenlight

Makefile.

> project so that the project is built and
> installed. A template template is alo added.

Duplicated "template".

> ---
>  tools/Makefile                    | 15 +++++++++++++++
>  tools/golang/xenlight/Makefile    | 29 +++++++++++++++++++++++++++++
>  tools/golang/xenlight/xenlight.go |  7 +++++++
>  3 files changed, 51 insertions(+)
>  create mode 100644 tools/golang/xenlight/Makefile
>  create mode 100644 tools/golang/xenlight/xenlight.go
> 
> diff --git a/tools/Makefile b/tools/Makefile
> index 71515b4..b89f06b 100644
> --- a/tools/Makefile
> +++ b/tools/Makefile
> @@ -11,6 +11,7 @@ SUBDIRS-y += misc
>  SUBDIRS-y += examples
>  SUBDIRS-y += hotplug
>  SUBDIRS-y += xentrace
> +SUBDIRS-y += golang/xenlight

This shouldn't be built unconditionally.

Please use configure to probe for go compiler first.

"GNU autotools" is the term to google for. But I guess it wouldn't be
too hard to follow existing examples.

Don't hesitate to ask questions.

>  SUBDIRS-$(CONFIG_XCUTILS) += xcutils
>  SUBDIRS-$(CONFIG_X86) += firmware
>  SUBDIRS-y += console
> @@ -311,6 +312,20 @@ subdir-install-debugger/gdbsx: .phony
>  subdir-all-debugger/gdbsx: .phony
>       $(MAKE) -C debugger/gdbsx all
>  
> +subdir-all-golang/xenlight: .phony
> +     $(MAKE) -C golang/xenlight all
> +
> +subdir-clean-golang/xenlight: .phony
> +     $(MAKE) -C golang/xenlight clean
> +
> +subdir-install-golang/xenlight: .phony
> +     $(MAKE) -C golang/xenlight install
> +
> +subdir-build-golang/xenlight: .phony
> +     $(MAKE) -C golang/xenlight build
> +
> +subdir-distclean-golang/xenlight: .phony
> +     $(MAKE) -C golang/xenlight distclean
>  

I think I would prefer to organise this like python bindings. That is,
to have a dedicated Makefile under $LANG (python or golang) directory.

What do you think?

>  subdir-clean-debugger/kdd subdir-distclean-debugger/kdd: .phony
>       $(MAKE) -C debugger/kdd clean
> diff --git a/tools/golang/xenlight/Makefile b/tools/golang/xenlight/Makefile
> new file mode 100644
> index 0000000..c723c1d
> --- /dev/null
> +++ b/tools/golang/xenlight/Makefile
> @@ -0,0 +1,29 @@
> +XEN_ROOT=$(CURDIR)/../../..
> +include $(XEN_ROOT)/tools/Rules.mk
> +
> +BINARY = xenlightgo
> +GO = go

This should probably be:

  GO ?= go

> +
> +.PHONY: all
> +all: build
> +
> +.PHONY: build
> +build: xenlight
> +
> +.PHONY: install
> +install: build
> +     [ -f $(BINARY) ] || $(INSTALL_PROG) xenlight.go $(DESTDIR)$(bindir)
> +
> +.PHONY: clean
> +clean:
> +     $(RM) $(BINARY)

If there are other intermediate files generated, they should be deleted,
too.

> +
> +.PHONY: distclean
> +distclean: clean
> +
> +
> +xenlight: xenlight.go

xenlightgo: xenlight.go and delete BINARY

or

$(BINARY): xenlight.go

> +     $(GO) build -o $(BINARY) xenlight.go

Use $@ instead of $(BINARY).  Use $< instead of xenlight.go.

But before we spend too much time on details, let's sort out some higher
level issues first. My golang knowledge is rather rusted, please bear
with me. :-)

I have a question: how does golang build a package that has multiple
files? Presumably it has some sort of file that acts like Makefile. If
so, you should probably introduce that now and use that to build this
package.

Otherwise in order to avoid repetition you probably need something like
the %.o: %.c rule in tools/Rules.mk.

If you need more information about GNU Make, please use `info make` on
your system or ask questions here.

> +
> +
> +-include $(DEPS)
> diff --git a/tools/golang/xenlight/xenlight.go 
> b/tools/golang/xenlight/xenlight.go
> new file mode 100644
> index 0000000..50e8d8d
> --- /dev/null
> +++ b/tools/golang/xenlight/xenlight.go
> @@ -0,0 +1,7 @@
> +package main
> +
> +import "fmt"
> +
> +func main() {
> +     fmt.Println("vim-go")

vim-go ?

> +}
> -- 
> 2.7.4
> 

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