Re: AC_PROG_PERL (macro, docs, used in configure.in)

[Akim Demaille]

Index: acspecific.m4
===================================================================
RCS file: /cvs/autoconf/acspecific.m4,v
retrieving revision 1.331
diff -u -r1.331 acspecific.m4
--- acspecific.m4       2001/01/23 17:04:36     1.331
+++ acspecific.m4       2001/01/23 20:54:54
@@ -297,6 +297,39 @@
 ])# AC_PROG_LN_S
 
 
+# AC_PROG_PERL([MIN-VERSION])
+# ---------------------------
+AC_DEFUN(AC_PROG_PERL,

Please, *always* quote arguments, included here.


+[# find perl binary
+AC_MSG_CHECKING([for perl])
+AC_CACHE_VAL(ac_cv_prog_PERL,
+[ifelse([$1],,,
+        [echo "configure:__oline__: ...version $1 required" 
>&AS_MESSAGE_LOG_FD])
+  # allow user to override
+  if test -n "$PERL"; then
+    ac_try="$PERL"
+  else
+    ac_try="perl perl5"
+  fi
+
+  for ac_prog in $ac_try; do
+    echo "configure:__oline__: trying $ac_prog" >&AS_MESSAGE_LOG_FD
+    if ($ac_prog -e 'printf "found version %g\n",$[@:>@];' ifelse([$1],,,

Quotation of the quadrigraph is overkill here, but not wrong.
Globally, that's one place that would enjoy using AC_TRY_COMMAND or
so.  Can be done later, just thinking aloud.

+        [-e 'require $1;'])) 1>&AS_MESSAGE_LOG_FD 2>&1; then
+      ac_cv_prog_PERL=$ac_prog
+      break
+    fi
+  done])dnl
+PERL="$ac_cv_prog_PERL"
+if test -n "$PERL"; then
+  AC_MSG_RESULT($PERL)
+else
+  AC_MSG_RESULT(no)
+fi
+AC_SUBST(PERL)dnl
+])# AC_PROG_PERL
+
+
 # AC_RSH
 # ------
 # I don't know what it used to do, but it no longer does.
Index: doc/autoconf.texi
===================================================================
RCS file: /cvs/autoconf/doc/autoconf.texi,v
retrieving revision 1.421
diff -u -r1.421 autoconf.texi
--- doc/autoconf.texi   2001/01/22 19:21:58     1.421
+++ doc/autoconf.texi   2001/01/23 20:55:06
@@ -2811,6 +2811,35 @@
 @end example
 @end defmac
 
address@hidden AC_PROG_PERL
address@hidden PROG_PERL
address@hidden PERL
+If @code{perl} is found, set output variable @code{PERL} to the name of its
+executable.  Otherwise, leave it empty.
+By default, @code{perl} and @code{perl5} are tried, but you can use the
address@hidden variable to override the list of executables to check.
+
+The optional argument to this macro specifies a minimum version to find;

Arguments, including optional args, should be given in the signature
of the macro:

@defmac AC_PROG_PERL @ovar{version}


address@hidden will not be set if too old a perl is found. Make sure you use
+perl's version numbering conventions though: '5.6' is seen as version 5,
+subversion 600 (not 6); you need to use 5.006 to require perl 5.6.0.

:) :) :) Gosh!


I'll fix this myself, thanks!