🚀 go-pugleaf

Earlier, I reported that autheader fails to parse m4 output
because of incompatibility between traditional `sed' and GNU sed.
Namely, for '/pattern1/,/pattern2/' construct, traditional sed
sometimes doesn't consider it is the end of range if both
patterns appear on the same line.  This patch works around this
problem and should work with both traditional and GNU sed.

There is another sed related problem in autoheader.sh.
Traditional sed doesn't like the following construct (attempt to
replace something with a newline):

sed 's/foo/
/g'

-- >8 ---- >8 ---- >8 ---- >8 ---- >8 ---- >8 ---- >8 ----
$ rcsdiff -c3 -r1.1 autoheader.sh
===================================================================
RCS file: autoheader.sh,v
retrieving revision 1.1
diff -c3 -r1.1 autoheader.sh
*** autoheader.sh	1993/01/25 19:06:06	1.1
--- autoheader.sh	1993/01/25 19:06:57
***************
*** 63,69 ****
  # autoconf processing of the input file.
  eval "`echo \"$frob\" \
         | m4 $MACROFILES - $infile \
!        | sed -n '/^@@@/,/@@@$/s/^@*\([^@]*\)@*$/\1/p'`"
  
  # Make SYMS newline-separated rather than blank-separated.
  syms="`for sym in $syms; do echo $sym; done`"
--- 63,77 ----
  # autoconf processing of the input file.
  eval "`echo \"$frob\" \
         | m4 $MACROFILES - $infile \
!        | sed -n -e '
! 		: again
! 		/^@@@.*@@@$/s/@@@\(.*\)@@@$/\1/p
! 		/^@@@/{
! 			s/^@@@//p
! 			n
! 			s/^/@@@/
! 			b again
! 		}'`"
  
  # Make SYMS newline-separated rather than blank-separated.
  syms="`for sym in $syms; do echo $sym; done`"