bug#7800: automake fails to honor `-d' in AM_YFLAGS when variable expansions are involved

[Ralf Corsepius]

On 01/07/2011 03:36 PM, Stefano Lattarini wrote:
> severity: wishlist
> thanks
>
> -*-*-
>
> Hello automakers.
>
> Currently, automake is not smart enough to resolve variable expansions
> in AM_YFLAGS (or foo_YFLAGS) when scanning them for the `-d' flag.
>
> For example:
>
>    $ cat configure.ac
>    AC_INIT(x,0)
>    AM_INIT_AUTOMAKE(foreign)
>    AC_PROG_CC
>    AC_PROG_YACC
>    AC_CONFIG_FILES(Makefile)
>    $ cat Makefile.am
>    bin_PROGRAMS = foo bar
>    foo_SOURCES = foo.y
>    bar_SOURCES = bar.y
>    my_YFLAGS = -d
>    AM_YFLAGS = $(my_YFLAGS)
>    bar_YFLAGS = $(my_YFLAGS)
>    $ aclocal
>    $ automake -a
>    $ egrep '(foo|bar).h\.*:' Makefile.in # no match :-(
>    $ sed -i 's/$(my_YFLAGS)/-d/' Makefile.am
>    $ automake
>    $ egrep '(foo|bar)\.h.*:' Makefile.in # now as expected
>    bar-bar.h: bar-bar.c
>    foo.h: foo.c
>
> Not sure if this bug is worth fixing,
This once used to work

=> regression.