getting $LDFLAGS for a classic snap build in the plugin

[Michael Hudson-Doyle]

On 6 March 2017 at 02:48, Sergio Schvezov <sergio.schvezov at canonical.com>
wrote:

> On Tue, Feb 28, 2017 at 6:11 PM, Michael Hudson-Doyle <
> michael.hudson at canonical.com> wrote:
>
>> Hi,
>>
>> The magic of classic confinement snaps is all in passing special flags
>> when linking an executable. If I've read things right, snapcraft does this
>> by wrapping any command you execute with BasePlugin.run() with some shell
>> code that sets LDFLAGS.
>>
>> Unfortunately, for the go classic snap the underlying tool does not care
>> at all about LDFLAGS. What I do is create a wrapper:
>>
>> #!/bin/sh
>> exec gcc $LDFLAGS "$@"
>>
>> and point the go tool at that. This works but it would be a lot cleaner
>> if I could just get at the linker flags in my snap's plugin. Any chance
>> that could be added?
>>
>
> Hi there, I am sort of confused by the wording here, can you expand a bit
> on what you want. When you say "snap's plugin", what do you mean?
>
> I fear I am being dull but I honestly don't understand the question and
> given that it has gone unanswered for a couple of days maybe others are
> having issues parsing this as well (or maybe discussed on IRC and already
> taken care of).
>


My snap uses a custom plugin to build, so by "my snap's plugin" I mean
https://git.launchpad.net/~mwhudson/+git/gosnap/tree/snap/plugins/x_gobuild.py?h=go1.8.
In that code, I want to access the flags that need to be passed to the
linker to make classic snaps link against the core snap rather than the
usual path (-Wl,-z,nodefib, -Wl,-rpath,xxx, etc). Currently, as I read
things, it can't (well not without very silly hacks).

Cheers,
mwh
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