On Tuesday, July 06, 2010 00:13:55 Eric Blake wrote: > ----- "Mike Frysinger" <vap...@gentoo.org> wrote: > > i believe a recent autoconf update triggered a bug in m4 while > > processing > > crappy m4 code. the project in question is "rezound": > > http://rezound.sf.net/ (version 0.12.3_beta to be exact) > > > > the reduced test case is: > > $ cat configure.ac > > AC_INIT > > ajv_CXX_FLAG(-g) > > AC_OUTPUT > > $ cat aclocal.m4 > > AC_DEFUN(ajv_CXX_FLAG, > > > > [AC_MSG_CHECKING(if $CXX accepts $1 )] > > AC_MSG_RESULT(yes) > > > > ) > > $ autoconf > > <hang here in m4> > > That's a bug in the user's configure.ac script for not quoting things > correctly in the first place. Autoconf can't work around every > piece of bad code thrown at it, and my recommendation would > be to fix rezound rather than trying to throw more workarounds in > autoconf to avoid this bad code at the expense of penalizing > performance on good code.
i agree rezound has crappy code (i made suggestions for throwing out the whole thing for something better), but i think m4 should be smarter about infinite loops. this could just as easily been a typo and about the only way to track it down is to literally start commenting out things in the source until it stops looping forever. that's a poor development environment imo. -mike
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