> According to Matěj Týč on 3/23/2009 5:25 PM: > > Hello, I have found out that having this in configure.ac is a problem: > > > > AC_DEFUN([foo], > > [echo "#" ]) > > The bug is in your code - # starts a comment in m4, hence, the ]) is still > part of the comment, and you haven't finished the AC_DEFUN. > > > However, this is OK: > > > > AC_DEFUN([foo], > > [echo "#" dnl > > ]) > > Yes, but there, the dnl is unexpanded, because it is output as part of the > comment instead of its normal role of stripping output to the next > newline. And that can in turn cause surprises. You are right with this one. However, the output of echo is '# dnl'. I would expect "comments" do disappear completely rather then to appear in the text. I have solved the case by adding another line after the line with the unquoted # and everything seemed to be fine. This was confusing... Now I understand that the hash only prevents m4 actions... > > This is not nice since for instance > > AC_DEFUN([foo], > > [echo "#define foo" > $somwhere ]) > > fails as well... > > Use proper quoting. Fully quoted (if there are no other macros): > > AC_DEFUN([foo], > [[echo "#define foo" > $somewhere]]) > > or minimally quoted (so that echo and somewhere can still be replaced by > macros): > > AC_DEFUN([foo], > [echo "[#]define foo" > $somewhere]) > > or use quadrigraphs: > > AC_DEFUN([foo], > [echo "@%:@define foo" > $somewhere]) > > and reread this section of the manual: > http://www.gnu.org/software/autoconf/manual/autoconf.html#M4-Quotation > Regarding the manual: I have If you look at the page 158 (AS_TR_CPP description), there is an unquoted hash (#) used in a configure.ac-like file without any warning. On the other hand, the problem is very well described in the M4 quotation section which I have overlooked.. Thank you very much for your help! _______________________________________________ Autoconf mailing list Autoconf@xxxxxxx http://lists.gnu.org/mailman/listinfo/autoconf
