bug#13524: Improving user experience for non-recursive builds

[Peter Rosin]

On 2013-02-04 00:10, Peter Rosin wrote:
> On 2013-02-03 21:42, Stefano Lattarini wrote:
>> I've pushed the promised patches to the rewindable branch
>> 'experimental/preproc' (based off of maint).  I'll also soon
>> send them to the list to simplify review (I will drop the
>> bug tracker from CC:, to avoid cluttering up the report).
>>
>> As usual, reviews are welcome.
> 
> I like the end result of this series, I especially like that I don't have
> to type &{this}& anymore.

*snip*

Oops, a couple more things. The new naming will clobber
anyone using a Makefile variable named RELDIR with brace
syntax. E.g., this previously working code is broken by
the series.

RELDIR = src
foobar_CPPFLAGS = $(AM_CPPFLAGS) -DRELDIR=${RELDIR}

It will be preprocessed into

RELDIR = src
foobar_CPPFLAGS = $(AM_CPPFLAGS) -DRELDIR=$src

and quasi-expanded into (assuming $s is empty)

foobar_CPPFLAGS = $(AM_CPPFLAGS) -DRELDIR=rc

Not sure what to do about it, or if it matters...



Further, the use of /dev/full in the demo test is not
portable. If I create /dev on Windows (i.e. C:\dev, or have
it previously, I didn't, but not unlikely), and am allowed
to write there (likely, on Windows), and /dev/full isn't
supported (where is it supported, except Linux?), then the
test falls apart. The MinGW program happily writes "dummy"
to /dev/full (i.e. C:\dev\full from its view of the file
system) but the MSYS script does not think /dev/full is a
character device and it is not be allowed to write to
/dev/full either, because typically /dev doesn't exist as
a real directory. Typically /dev is virtual in MSYS (if it
existed, it would be C:\MinGW\msys\1.0\dev from the MSYS
view of the file system) so it assumes the MinGW program
skipped, but it didn't.

Why use special features like /dev/full in the testsuite of
Automake? Surely there are better things one can do to check if
a Makefile works. Mixing in stuff like that is just a recipe
for strange bug reports and hardship for those on weird
platforms. The gain for Automake is zero.

Also, creating the file /dev/full with content "dummy" is
bad manors, even if someone runs the testsuite as root (on a
system not supporting /dev/full) and arguably deserves it.

Cheers,
Peter