Re: libtool support for hosts with strict "grep", "test"

[Alexandre Duret-Lutz]

[Following up to an old thread.]

>>> "Akim" == Akim Demaille <address@hidden> writes:

 Akim> 2002-10-23  Paul Eggert  <address@hidden>
[...]
 Akim>        * libtool.m4 (AC_PROG_EGREP):
 Akim>        New macro, defined if Autoconf doesn't define.
[...]

 Akim> Installed.

+# AC_PROG_EGREP
+# -------------
+# This is predefined starting with Autoconf 2.54, so this conditional
+# definition can be removed once we require Autoconf 2.54 or later.
+m4_ifndef([AC_PROG_EGREP], [AC_DEFUN([AC_PROG_EGREP],
+[AC_CACHE_CHECK([for egrep], [ac_cv_prog_egrep],
+   [if echo a | (grep -E '(a|b)') >/dev/null 2>&1
+    then ac_cv_prog_egrep='grep -E'
+    else ac_cv_prog_egrep='egrep'
+    fi])
+ EGREP=$ac_cv_prog_egrep
+ AC_SUBST([EGREP])
+])])

When the installed libtool.m4 contains this code, aclocal will
detect the AC_DEFUNition of AC_PROG_EGREP and include a copy of
libtool.m4 in any project using AC_PROG_EGREP.

I don't really see how aclocal could be fixed, so I suggest
disguising the call to AC_DEFUN (maybe using indir?  aclocal
expects an opening parenthesis right after a macro name) or its
argument.

BTW, when will Libtool stop supporting Autoconf < 2.54 ?
-- 
Alexandre Duret-Lutz