Re: reduce forks during autoconf

[Eric Blake]

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According to Bruno Haible on 5/13/2008 6:16 PM:

| Very good observation! When autoconf is slow, I usually blame 'm4', not
| the number of forks :-)

But both m4 and m4sugar have gotten faster in the past year :)

|   func_emit_initmacro_end ()
|   {
|     macro_prefix_arg="$1"
| +   # Check the presence of files that are mentioned as AC_LIBSOURCES
arguments.
| +   # The check is performed only when autoconf is run from the
directory where
| +   # the configure.ac resides; if it is run from a different directory, the
| +   # check is skipped.
| +   echo "  m4_ifval([${macro_prefix_arg}_LIBSOURCES_LIST], ["

This needs to be m4_ifset, not m4_ifval.  As written, you are checking
that *_LIBSOURCES_LIST is not the empty string (it's not); you really want
to know whether the macro by that name is defined to a non-empty value.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             address@hidden
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