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