Re: [Automake-ng] [PATCH 1/4] [ng] compiling: implement VPATH rewrites using GNU make primitives

[Jim Meyering]

Stefano Lattarini wrote:
> This will shave off extra forks from compilation rules.  No semantic
> change is expected from this commit.  Suggestion from Eric Bake.
>
> * lib/am/depend2.am (am__vpath_rewrite): New internal macro,
> implements VPATH rewrites only using GNU make primitives.
> Use it in several compilation rules.
> ---
>  lib/am/depend2.am |   25 ++++++++++++++-----------
>  1 files changed, 14 insertions(+), 11 deletions(-)
>
> diff --git a/lib/am/depend2.am b/lib/am/depend2.am
...
> +## Emulate VPATH rewrites.  This only uses GNU make primitives, which
> +## allows us to avoid extra forks.
> +am__vpath_rewrite = $(firstword $(wildcard $(strip $(1))) $(srcdir)/$(strip 
> $(1)))

Nice change.
At least when it's easy, as it is here, please try to limit
line length to 79 or 80:

am__vpath_rewrite = \
  $(firstword $(wildcard $(strip $(1))) $(srcdir)/$(strip $(1)))