"behavior" -> "behavior".
Warn about \(...\)* in Solaris sed (written by Ralf Menzel).
* lib/autoconf/general.m4: Omit blank after ":" sed command,
as per POSIX.
* lib/m4sugar/m4sh.m4: Likewise.
* lib/autoconf/status.m4 (_AC_OUTPUT_HEADERS): Work around problem
with Solaris sed. Fix by Stepan Kasal.
2005-06-10 Paul Eggert <eggert@cs.ucla.edu>
+ * doc/autoconf.texi: "filesystem" -> "file system".
+ "behavior" -> "behavior".
+ Warn about \(...\)* in Solaris sed (written by Ralf Menzel).
+ * lib/autoconf/general.m4: Omit blank after ":" sed command,
+ as per POSIX.
+ * lib/m4sugar/m4sh.m4: Likewise.
+ * lib/autoconf/status.m4 (_AC_OUTPUT_HEADERS): Work around problem
+ with Solaris sed. Fix by Stepan Kasal.
+
* man/Makefile.am (MOSTLYCLEANFILES): Add $(srcdir)/*.t.
(.x.1): Ignore the time stamp in the .TH line when deciding whether
to update the man page. That way, we don't have to check in new
only viable way to distribute automatic build rules for software, but
one quickly runs into @command{make}'s numerous limitations. Its lack of
support for automatic dependency tracking, recursive builds in
-subdirectories, reliable timestamps (e.g., for network filesystems), and
+subdirectories, reliable timestamps (e.g., for network file systems), and
so on, mean that developers must painfully (and often incorrectly)
reinvent the wheel for each project. Portability is non-trivial, thanks
to the quirks of @command{make} on many systems. On top of all this is the
of @command{configure}. This is for packages that might use a
non-Autoconf script @command{Configure}, which can't be called through a
wrapper @command{configure} since it would be the same file on
-case-insensitive filesystems. Likewise, if a @var{dir} contains
+case-insensitive file systems. Likewise, if a @var{dir} contains
@file{configure.in} but no @command{configure}, the Cygnus
@command{configure} script found by @code{AC_CONFIG_AUX_DIR} is used.
Logical names are what the user specified.
@item
Physical names may not be portable from one installation
-host to another due to network filesystem gymnastics.
+host to another due to network file system gymnastics.
@item
On modern hosts @samp{pwd -P} may fail due to lack of permissions to
some parent directory, but plain @command{pwd} cannot fail for this
@cindex timestamp resolution
Traditionally, file timestamps had 1-second resolution, and @samp{cp
--p} copied the timestamps exactly. However, many modern filesystems
+-p} copied the timestamps exactly. However, many modern file systems
have timestamps with 1-nanosecond resolution. Unfortunately, @samp{cp
-p} implementations truncate timestamps when copying files, so this
can result in the destination file appearing to be older than the
quite portable to modern hosts, but is not supported by some older
@command{sed} implementations like SVR3.
+Some @command{sed} implementations, e.g., Solaris 10,
+restrict the special role of the asterisk to one-character regular expressions.
+This may lead to unexpected behavior:
+
+@example
+$ @kbd{echo '1*23*4' | /usr/bin/sed 's/\(.\)*/x/g'}
+x2x4
+$ @kbd{echo '1*23*4' | /usr/xpg4/bin/sed 's/\(.\)*/x/g'}
+x
+@end example
+
The @option{-e} option is portable.
Some people prefer to use it:
There are two things one should remember about @samp{t} in @command{sed}.
Firstly, always remember that @samp{t} jumps if @emph{some} substitution
succeeded, not only the immediately preceding substitution. Therefore,
-always use a fake @samp{t clear; : clear} to reset the t flag where
+always use a fake @samp{t clear; :clear} to reset the t flag where
needed.
Secondly, you cannot rely on @command{sed} to clear the flag at each new
@cindex timestamp resolution
Traditionally, file timestamps had 1-second resolution, and
@command{make} used those timestamps to determine whether one file was
-newer than the other. However, many modern filesystems have
+newer than the other. However, many modern file systems have
timestamps with 1-nanosecond resolution. Some @command{make}
implementations look at the entire timestamp; others ignore the
fractional part, which can lead to incorrect results. Normally this
Availability of libraries and library functions should always be checked
by probing.
@item
-Variant behaviour of system calls is best identified with runtime tests
+Variant behavior of system calls is best identified with runtime tests
if possible, but bug workarounds or obscure difficulties might have to
be driven from @samp{$host}.
@item
_AC_CACHE_DUMP() |
sed ['
t clear
- : clear
+ :clear
s/^\([^=]*\)=\(.*[{}].*\)$/test "${\1+set}" = set || &/
t end
/^ac_cv_env/!s/^\([^=]*\)=\(.*\)$/\1=${\1=\2}/
- : end'] >>confcache
+ :end'] >>confcache
if diff $cache_file confcache >/dev/null 2>&1; then :; else
if test -w $cache_file; then
test "x$cache_file" != "x/dev/null" && echo "updating cache $cache_file"
#
dnl Quote, for the `[ ]' and `define'.
[ac_dA='s,^\([ ]*#[ ]*\)[^ ]*\([ ][ ]*'
-ac_dB='\)\([ (].*\)*$,\1define\2'
+ac_dB='\)[ (].*$,\1define\2'
ac_dC=' '
-ac_dD=',']
-dnl ac_dD used to contain `;t' at the end.
-dnl This was an optimization which was making the code both slow and incorrect.
-dnl 1) Since the script has to be broken to chunks containing 100 commands,
-dnl this extra command means we have to call sed more times.
-dnl 2) The code was incorrect: in the strange case that a sumbol has multiple
-dnl different AC_DEFINEs, we want to honour the *last* one.
+ac_dD=' ,']
+dnl ac_dD used to contain `;t' at the end, but that was both slow and incorrect.
+dnl 1) Since the script must be broken into chunks containing 100 commands,
+dnl the extra command meant extra calls to sed.
+dnl 2) The code was incorrect: in the unusual case where a symbol has multiple
+dnl different AC_DEFINEs, the last one should be honored.
+dnl
+dnl ac_dB works because every line has a space appended. ac_dB reinserts
+dnl the space, because some symbol may have been AC_DEFINEd several times.
[ac_word_regexp=[_$as_cr_Letters][_$as_cr_alnum]*]
# Transform confdefs.h into a sed script `conftest.defines', that
# substitutes the proper values into config.h.in to produce config.h.
-# And first: Protect against being on the right side of a sed subst in
-# config.status. Protect against being in an unquoted here document
-# in config.status.
-# If some macros were called several times there might be several times
-# the same #defines, which is useless. Nevertheless, we may not want to
-# sort them, since we want the *last* AC_DEFINE to be honored.
+rm -f conftest.defines conftest.tail
+# First, append a space to every undef/define line, to ease matching.
+echo 's/$/ /' >conftest.defines
+# Then, protect against being on the right side of a sed subst, or in
+# an unquoted here document, in config.status. If some macros were
+# called several times there might be several #defines for the same
+# symbol, which is useless. But do not sort them, since the last
+# AC_DEFINE must be honored.
dnl
dnl Quote, for `[ ]' and `define'.
-[rm -f conftest.defines conftest.tail
-ac_word_re=[_$as_cr_Letters][_$as_cr_alnum]*
+[ac_word_re=[_$as_cr_Letters][_$as_cr_alnum]*
uniq confdefs.h |
sed -n '
t rset
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
+ ' >>conftest.defines
]
-# This sed command replaces #undef with comments. This is necessary, for
+# Remove the space that was appended to ease matching.
+# Then replace #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.
-# (The regexp can be very short, we know the line contains either #define
-# or #undef.)
-echo '[s,^[ #]*u.*,/* & */,]' >>conftest.defines
+# (The regexp can be short, since the line contains either #define or #undef.)
+echo 's/ $//
+[s,^[ #]*u.*,/* & */,]' >>conftest.defines
# Break up conftest.defines:
ac_max_sed_lines=m4_eval(_AC_SED_CMD_LIMIT - 3)
s,[[$]]LINENO.*,&-,
t lineno
b
- : lineno
+ :lineno
N
- : loop
+ :loop
s,[[$]]LINENO\([[^'$as_cr_alnum'_]].*\n\)\(.*\),\2\1\2,
t loop
s,-\n.*,,
projects / thirdparty / autoconf.git / commitdiff
