Hmm but I am also not changing the Go source of the package in question,
yet the C sources seem to get recompiled.

Just to make sure we're on the same page, I have two packages: mypkg and
go-sqlite3, where the former is pure Go and the depends on the latter,
which contains both C and Go code. Whenever I make changes to Go sources in
mypkg I can see that the cgo compiler is being run on go-sqlite3.

On Wed, Jun 15, 2016 at 3:23 PM Ian Lance Taylor <i...@golang.org> wrote:

> On Wed, Jun 15, 2016 at 2:54 PM, Alex Flint <alex.fl...@gmail.com> wrote:
> > Under what conditions does a cgo package get recompiled? I am using
> > go-sqlite3 and it appears that the C compiler/linker is run every time I
> > build my project, even though I am not changing any of the C sources. I
> > would have expected it to be run once and then the results re-used, but
> > perhaps there are some special rules for cgo recompilation?
>
> Currently the go tool either compiles an entire package or doesn't
> compile it at all.  If it is a cgo package with .c files, it compiles
> those .c files every time it thinks any part of the package needs to
> be recompiled--e.g., if you changed the Go code.
>
> I thought there was an issue open about that, but I couldn't find it.
>
> Ian
>

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