Re: makes which break with `silent-rules'

[Thomas Dickey]

On Sun, 24 May 2009, Bruno Haible wrote:

> >  - The `silent-rules' option enables Linux kernel-style silent build output.
> >    This option requires the widely supported but non-POSIX `make' feature
> >    of recursive variable expansion,
>
> We are talking about constructs like this:
>
> ====== Makefile ======
> all :
>         echo $(XY_V)
>
> XY_V = $(XY_$(V))
> XY_0 = silent
> XY_1 = verbose
> XY_ = unknown
> ======================
>
> I think this is supported by POSIX. POSIX [1] says: "Macros can appear anywhere
> in the makefile.".

POSIX says that; however different implementations of 'make' treat
forward-references differently.

--
Thomas E. Dickey
http://invisible-island.net
ftp://invisible-island.net