Hello,
this time, the patch is really attached.
Sorry,
Stepan Kasal
------------
Hi,
I finished the patch discussed in this thread.
The following things changes since the previous version:
- the sed command which creates `conftest.defines' was changed;
I use as_cr_alnum and such to increase portability.
This eliminated the `t' command in the script, so the comment
(which Paul rewrote in his previous mail) was removed.
- All other Paul's comment fixes were incorporated; I'm afraid my
previous patch was unfinished with respect to comment editing.
- in the top of each sed fragment, we as_cr_alnum and such are used, too.
- _AC_SED_CMD_LIMIT is honored.
I committed the patch; please find it attched to this post.
Have a nice day,
Stepan Kasal
2005-06-06 Stepan Kasal <[EMAIL PROTECTED]>
* lib/autoconf/general.m4 (_AC_INIT_DEFAULTS): Nuke ac_max_here_lines.
* lib/autoconf/status.m4 (_AC_OUTPUT_HEADERS): Simplify the sed
scripts created and the loop applying them, use _AC_SED_CMD_LIMIT.
Index: lib/autoconf/general.m4
===================================================================
RCS file: /cvsroot/autoconf/autoconf/lib/autoconf/general.m4,v
retrieving revision 1.862
retrieving revision 1.863
diff -u -r1.862 -r1.863
--- lib/autoconf/general.m4 24 May 2005 07:32:13 -0000 1.862
+++ lib/autoconf/general.m4 6 Jun 2005 08:15:47 -0000 1.863
@@ -401,11 +401,6 @@
AC_SUBST([SHELL], [${CONFIG_SHELL-/bin/sh}])dnl
AC_SUBST([PATH_SEPARATOR])dnl
-# Maximum number of lines to put in a shell here document.
-# This variable seems obsolete. It should probably be removed, and
-# only ac_max_sed_lines should be used.
-: ${ac_max_here_lines=38}
-
# Identity of this package.
AC_SUBST([PACKAGE_NAME],
[m4_ifdef([AC_PACKAGE_NAME], ['AC_PACKAGE_NAME'])])dnl
Index: lib/autoconf/status.m4
===================================================================
RCS file: /cvsroot/autoconf/autoconf/lib/autoconf/status.m4,v
retrieving revision 1.58
retrieving revision 1.60
diff -u -r1.58 -r1.60
--- lib/autoconf/status.m4 1 Jun 2005 06:54:47 -0000 1.58
+++ lib/autoconf/status.m4 6 Jun 2005 08:21:09 -0000 1.60
@@ -485,40 +485,6 @@
# itself into $CONFIG_STATUS (eg, via here documents). Upon exit, no
# here document shall be opened.
#
-#
-# The code produced used to be extremely costly: there are was a
-# single sed script (n lines) handling both `#define' templates,
-# `#undef' templates with trailing space, and `#undef' templates
-# without trailing spaces. The full script was run on each of the m
-# lines of `config.h.in', i.e., about n x m.
-#
-# Now there are two scripts: `conftest.defines' for the `#define'
-# templates, and `conftest.undef' for the `#undef' templates.
-#
-# Optimization 1. It is incredibly costly to run two `#undef'
-# scripts, so just remove trailing spaces first. Removes about a
-# third of the cost.
-#
-# Optimization 2. Since `#define' are rare and obsoleted,
-# `conftest.defines' is built and run only if grep says there are
-# `#define'. Improves by at least a factor 2, since in addition we
-# avoid the cost of *producing* the sed script.
-#
-# Optimization 3. In each script, first check that the current input
-# line is a template. This avoids running the full sed script on
-# empty lines and comments (divides the cost by about 3 since each
-# template chunk is typically a comment, a template, an empty line).
-#
-# Optimization 4. Once a substitution performed, since there can be
-# only one per line, immediately restart the script on the next input
-# line (using the `t' sed instruction). Divides by about 2.
-# *Note:* In the case of the AC_SUBST sed script (_AC_OUTPUT_FILES)
-# this optimization cannot be applied as is, because there can be
-# several substitutions per line.
-#
-#
-# The result is about, hm, ... times blah... plus.... Ahem. The
-# result is about much faster.
m4_define([_AC_OUTPUT_HEADERS],
[cat >>$CONFIG_STATUS <<\_ACEOF
@@ -526,20 +492,24 @@
# CONFIG_HEADERS section.
#
-# These sed commands are passed to sed as "A NAME B NAME C VALUE D", where
-# NAME is the cpp macro being defined and VALUE is the value it is being given.
-#
-# ac_d sets the value in "#define NAME VALUE" lines.
-dnl Double quote for the `[ ]' and `define'.
-[ac_dA='s,^\([ ]*\)#\([ ]*define[ ][ ]*\)'
-ac_dB='[ ].*$,\1#\2'
+# These sed commands are passed to sed as "A NAME B PARAMS C VALUE D", where
+# NAME is the cpp macro being defined, VALUE is the value it is being given.
+# PARAMS is the parameter list in the macro definition--in most cases, it's
+# just an empty string.
+#
+dnl Quote, for the `[ ]' and `define'.
+[ac_dA='s,^\([ ]*#[ ]*\)[^ ]*\([ ][ ]*'
+ac_dB='\)\([ (].*\)*$,\1define\2'
ac_dC=' '
-ac_dD=',;t'
-# ac_u turns "#undef NAME" without trailing blanks into "#define NAME VALUE".
-ac_uA='s,^\([ ]*\)#\([ ]*\)undef\([ ][ ]*\)'
-ac_uB='$,\1#\2define\3'
-ac_uC=' '
-ac_uD=',;t']
+ac_dD=',']
+dnl ac_dD used to contain `;t' at the end.
+dnl This was an optimization which was making the code both slow and incorrect.
+dnl 1) Since the script has to be broken to chunks containing 100 commands,
+dnl this extra command means we have to call sed more times.
+dnl 2) The code was incorrect: in the strange case that a sumbol has multiple
+dnl different AC_DEFINEs, we want to honour the *last* one.
+
+[ac_word_regexp=[_$as_cr_Letters][_$as_cr_alnum]*]
for ac_file in : $CONFIG_HEADERS; do test "x$ac_file" = x: && continue
# Support "outfile[:infile[:infile...]]", defaulting infile="outfile.in".
@@ -575,113 +545,82 @@
fi;;
esac
done` || AS_EXIT([1])
- # Remove the trailing spaces.
- sed 's/[[ ]]*$//' $ac_file_inputs >"$tmp/in"
_ACEOF
-# Transform confdefs.h into two sed scripts, `conftest.defines' and
-# `conftest.undefs', that substitutes the proper values into
-# config.h.in to produce config.h. The first handles `#define'
-# templates, and the second `#undef' templates.
+# Transform confdefs.h into a sed script `conftest.defines', that
+# substitutes the proper values into config.h.in to produce config.h.
# And first: Protect against being on the right side of a sed subst in
# config.status. Protect against being in an unquoted here document
# in config.status.
-rm -f conftest.defines conftest.undefs
-# Using a here document instead of a string reduces the quoting nightmare.
-# Putting comments in sed scripts is not portable.
-#
-# `end' is used to avoid that the second main sed command (meant for
-# 0-ary CPP macros) applies to n-ary macro definitions.
-# See the Autoconf documentation for `clear'.
-cat >confdef2sed.sed <<\_ACEOF
-dnl Double quote for `[ ]' and `define'.
-[s/[\\&,]/\\&/g
-s,[\\$`],\\&,g
-t clear
-: clear
-s,^[ ]*#[ ]*define[ ][ ]*\([^ (][^ (]*\)\(([^)]*)\)[
]*\(.*\)$,${ac_dA}\1${ac_dB}\1\2${ac_dC}\3${ac_dD},gp
-t end
-s,^[ ]*#[ ]*define[ ][ ]*\([^ ][^ ]*\)[
]*\(.*\)$,${ac_dA}\1${ac_dB}\1${ac_dC}\2${ac_dD},gp
-: end]
-_ACEOF
# If some macros were called several times there might be several times
# the same #defines, which is useless. Nevertheless, we may not want to
-# sort them, since we want the *last* AC-DEFINE to be honored.
-uniq confdefs.h | sed -n -f confdef2sed.sed >conftest.defines
-sed 's/ac_d/ac_u/g' conftest.defines >conftest.undefs
-rm -f confdef2sed.sed
-
+# sort them, since we want the *last* AC_DEFINE to be honored.
+dnl
+dnl Quote, for `[ ]' and `define'.
+[rm -f conftest.defines conftest.tail
+ac_word_re=[_$as_cr_Letters][_$as_cr_alnum]*
+uniq confdefs.h |
+ sed -n '
+ t rset
+ :rset
+ s/^[ ]*#[ ]*define[ ][ ]*//
+ t ok
+ d
+ :ok
+ s/[\\&,]/\\&/g
+ s/[\\$`]/\\&/g
+ s/^\('"$ac_word_re"'\)\(([^()]*)\)[
]*\(.*\)/${ac_dA}\1$ac_dB\2${ac_dC}\3$ac_dD/p
+ s/^\('"$ac_word_re"'\)[
]*\(.*\)/${ac_dA}\1$ac_dB${ac_dC}\2$ac_dD/p
+ ' >conftest.defines
+]
# This sed command replaces #undef with comments. This is necessary, for
# example, in the case of _POSIX_SOURCE, which is predefined and required
# on some systems where configure will not decide to define it.
-cat >>conftest.undefs <<\_ACEOF
-[s,^[ ]*#[ ]*undef[ ][ ]*[a-zA-Z_][a-zA-Z_0-9]*,/* & */,]
-_ACEOF
+# (The regexp can be very short, we know the line contains either #define
+# or #undef.)
+echo '[s,^[ #]*u.*,/* & */,]' >>conftest.defines
+
+# Break up conftest.defines:
+ac_max_sed_lines=m4_expr(_AC_SED_CMD_LIMIT - 3)
+
+# First sed command is: sed -f defines.sed $ac_file_inputs >"$tmp/out1"
+# Second one is: sed -f defines.sed "$tmp/out1" >"$tmp/out2"
+# Third one will be: sed -f defines.sed "$tmp/out2" >"$tmp/out1"
+# et cetera.
+ac_in='$ac_file_inputs'
+ac_out='"$tmp/out1"'
+ac_nxt='"$tmp/out2"'
-# Break up conftest.defines because some shells have a limit on the size
-# of here documents, and old seds have small limits too (100 cmds).
-echo ' # Handle all the #define templates only if necessary.' >>$CONFIG_STATUS
-echo ' if grep ["^[ ]*#[ ]*define"] "$tmp/in" >/dev/null; then'
>>$CONFIG_STATUS
-echo ' # If there are no defines, we may have an empty if/fi' >>$CONFIG_STATUS
-echo ' :' >>$CONFIG_STATUS
-rm -f conftest.tail
-while grep . conftest.defines >/dev/null
+while :
do
- # Write a limited-size here document to $tmp/defines.sed.
- echo ' cat >"$tmp/defines.sed" <<CEOF' >>$CONFIG_STATUS
- # Speed up: don't consider the non `#define' lines.
- echo ['/^[ ]*#[ ]*define/!b'] >>$CONFIG_STATUS
- # Work around the forget-to-reset-the-flag bug.
- echo 't clr' >>$CONFIG_STATUS
- echo ': clr' >>$CONFIG_STATUS
- sed ${ac_max_here_lines}q conftest.defines >>$CONFIG_STATUS
+ # Write a here document:
+ dnl Quote, for the `[ ]' and `define'.
+ echo [' # First, check the format of the line:
+ cat >"$tmp/defines.sed" <<CEOF
+/^[ ]*#[ ]*undef[ ][ ]*$ac_word_regexp[ ]*$/!{
+/^[ ]*#[ ]*define[ ][ ]*$ac_word_regexp[( ]/!b
+}'] >>$CONFIG_STATUS
+ sed ${ac_max_sed_lines}q conftest.defines >>$CONFIG_STATUS
echo 'CEOF
- sed -f "$tmp/defines.sed" "$tmp/in" >"$tmp/out"
- rm -f "$tmp/in"
- mv "$tmp/out" "$tmp/in"
-' >>$CONFIG_STATUS
- sed 1,${ac_max_here_lines}d conftest.defines >conftest.tail
+ sed -f "$tmp/defines.sed"' "$ac_in >$ac_out" >>$CONFIG_STATUS
+ ac_in=$ac_out ac_out=$ac_nxt ac_nxt=$ac_in
+ sed 1,${ac_max_sed_lines}d conftest.defines >conftest.tail
+ grep . conftest.tail >/dev/null || break
rm -f conftest.defines
mv conftest.tail conftest.defines
done
-rm -f conftest.defines
-echo ' fi # grep' >>$CONFIG_STATUS
-echo >>$CONFIG_STATUS
-
-# Break up conftest.undefs because some shells have a limit on the size
-# of here documents, and old seds have small limits too (100 cmds).
-echo ' # Handle all the #undef templates' >>$CONFIG_STATUS
-rm -f conftest.tail
-while grep . conftest.undefs >/dev/null
-do
- # Write a limited-size here document to $tmp/undefs.sed.
- echo ' cat >"$tmp/undefs.sed" <<CEOF' >>$CONFIG_STATUS
- # Speed up: don't consider the non `#undef'
- echo ['/^[ ]*#[ ]*undef/!b'] >>$CONFIG_STATUS
- # Work around the forget-to-reset-the-flag bug.
- echo 't clr' >>$CONFIG_STATUS
- echo ': clr' >>$CONFIG_STATUS
- sed ${ac_max_here_lines}q conftest.undefs >>$CONFIG_STATUS
- echo 'CEOF
- sed -f "$tmp/undefs.sed" "$tmp/in" >"$tmp/out"
- rm -f "$tmp/in"
- mv "$tmp/out" "$tmp/in"
-' >>$CONFIG_STATUS
- sed 1,${ac_max_here_lines}d conftest.undefs >conftest.tail
- rm -f conftest.undefs
- mv conftest.tail conftest.undefs
-done
-rm -f conftest.undefs
+rm -f conftest.defines conftest.tail
dnl Now back to your regularly scheduled config.status.
+echo "ac_result=$ac_in" >>$CONFIG_STATUS
cat >>$CONFIG_STATUS <<\_ACEOF
# Let's still pretend it is `configure' which instantiates (i.e., don't
# use $as_me), people would be surprised to read:
# /* config.h. Generated by config.status. */
if test x"$ac_file" != x-; then
echo "/* $ac_file. Generated by configure. */" >"$tmp/config.h"
- cat "$tmp/in" >>"$tmp/config.h"
+ cat "$ac_result" >>"$tmp/config.h"
if diff $ac_file "$tmp/config.h" >/dev/null 2>&1; then
AC_MSG_NOTICE([$ac_file is unchanged])
else
@@ -692,9 +631,9 @@
fi
else
echo "/* Generated by configure. */"
- cat "$tmp/in"
+ cat "$ac_result"
fi
- rm -f "$tmp/in"
+ rm -f "$tmp/out[12]"
dnl If running for Automake, be ready to perform additional
dnl commands to set up the timestamp files.
m4_ifdef([_AC_AM_CONFIG_HEADER_HOOK],
