configure.in patch

[Bang Jun-Young]

On Tue, Jun 26, 2001 at 11:42:07AM +0200, Marcus Meissner wrote:
> On Tue, Jun 26, 2001 at 05:43:55PM +0900, Bang Jun-Young wrote:
> > Why does configure check for flex twice? On NetBSD I get:
> > 
> > checking for bison... no
> > checking for byacc... no
> > checking for flex... flex
> > checking for yywrap in -lfl... yes
> > checking for flex... flex
> > 
> > (as seen above, autoconf doesn't search for `yacc' for
> > AC_PROG_YACC -- should be fixed)
> 
> It will use it as default if neither byacc nor flex are found.
> 
> The reason we check for 'flex' again is that the standard check sets LEX
> to 'lex' even if none is found, which lead to confusion during compile.
> 
> Our check is similar, but it finds out if 'lex' is present and aborts
> configure if not. 

Another question: why doesn't it doublecheck for yacc? There may 
be a system that doesn't have any parser installed by default and
at least one of yacc, byacc, and bison should be installed to 
compile.

I have made another patch:

diff -u -r1.209 configure.in
--- configure.in	2001/06/19 03:30:14	1.209
+++ configure.in	2001/06/26 11:26:50
@@ -54,6 +54,13 @@
 AC_PROG_CPP
 AC_PATH_XTRA
 AC_PROG_YACC
+AC_CHECK_PROGS(XYACC,$YACC yacc byacc bison,none)
+if test "$XYACC" = "none"
+then
+	echo "*** Error: No suitable parser found. ***"
+	echo "    Please install 'yacc', 'byacc', or 'bison' package."
+	exit 1
+fi
 AC_PROG_LEX
 AC_CHECK_PROGS(XLEX,$LEX flex lex,none)
 if test "$XLEX" = "none"

Jun-Young

-- 
Bang Jun-Young <bjy at mogua.org>