On Tue, Oct 08, 2002 at 10:11:28AM +0100, Stewart Brodie wrote:
> In message <[EMAIL PROTECTED]>
> "John W. Eaton" <[EMAIL PROTECTED]> wrote:
> > If necessary, I could put these tools in a separate directory with an
> > independent configure script, but then what is the correct way to tell
> > configure that it should ignore any setting of host and not set up for
> > cross compiling?
>
> This is the approach that I have taken:
>
> AC_MSG_NOTICE([configuring the tools for *native* builds])
> cd tools && \
> ./configure --build=$build_alias --host=$build_alias --target=$host_alias
Here's how I did it. Still a kludge, but it might offer a bit
more control. It takes advantage of the fact that
AC_CONFIG_SUBDIRS will run "configure.gnu" in preference to
"configure", if both are present.
- In the main configure.ac, call AC_CONFIG_SUBDIRS(tools).
- In the tools subdirectory, write a wrapper script called
configure.gnu, which takes the arguments passed in from the
top-level configure script and massages them however you
need, then calls:
$CONFIG_SHELL ./configure ...
to do the work.
- Write a tools/configure.ac and do the usual stuff with it.
In my case, I don't think I had to do anything special to
make it work with this scheme.
Specifying "$CONFIG_SHELL" in the wrapper can be important; don't
just say:
./configure ...
I found that the latter made the sub-configure script run verrrry
slooowwwwly on Solaris -- much more slowly than the top-level
one.
I was trying to solve a different ultimate problem, so I can't
speak to the cross-vs.-native issue itself.
(Re. slow subconfigures:
- The slowness came from the fact that if configure decides it
has to do $LINENO substitution, it then "."s the resulting
configure.lineno instead of execing it, and "."ing a huge
shell script turns out to be painfully slow in Solaris ksh.
- Of course, ksh understands $LINENO, so configure.lineno
substitution shouldn't have been done in the first place.
That it was, was due to a weird interaction (whose details I
forget) between the two shells' $LINENO decision-making, and
some information being lost somewhere along the way.
Explicitly running the subconfigure script in $CONFIG_SHELL
solved it, whatever it was.)
--
| | /\
|-_|/ > Eric Siegerman, Toronto, Ont. [EMAIL PROTECTED]
| | /
The acronym for "the powers that be" differs by only one letter
from that for "the pointy-haired boss".
