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Diffstat (limited to 'm4/ax_prog_bison.m4')
| -rw-r--r-- | m4/ax_prog_bison.m4 | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/m4/ax_prog_bison.m4 b/m4/ax_prog_bison.m4 new file mode 100644 index 00000000000..dae4470ea45 --- /dev/null +++ b/m4/ax_prog_bison.m4 @@ -0,0 +1,71 @@ +# =========================================================================== +# http://www.gnu.org/software/autoconf-archive/ax_prog_bison.html +# =========================================================================== +# +# SYNOPSIS +# +# AX_PROG_BISON(ACTION-IF-TRUE,ACTION-IF-FALSE) +# +# DESCRIPTION +# +# Check whether bison is the parser generator. Run ACTION-IF-TRUE if +# successful, ACTION-IF-FALSE otherwise +# +# LICENSE +# +# Copyright (c) 2009 Francesco Salvestrini <[email protected]> +# Copyright (c) 2010 Diego Elio Petteno` <[email protected]> +# +# This program is free software; you can redistribute it and/or modify it +# under the terms of the GNU General Public License as published by the +# Free Software Foundation; either version 2 of the License, or (at your +# option) any later version. +# +# This program is distributed in the hope that it will be useful, but +# WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General +# Public License for more details. +# +# You should have received a copy of the GNU General Public License along +# with this program. If not, see <http://www.gnu.org/licenses/>. +# +# As a special exception, the respective Autoconf Macro's copyright owner +# gives unlimited permission to copy, distribute and modify the configure +# scripts that are the output of Autoconf when processing the Macro. You +# need not follow the terms of the GNU General Public License when using +# or distributing such scripts, even though portions of the text of the +# Macro appear in them. The GNU General Public License (GPL) does govern +# all other use of the material that constitutes the Autoconf Macro. +# +# This special exception to the GPL applies to versions of the Autoconf +# Macro released by the Autoconf Archive. When you make and distribute a +# modified version of the Autoconf Macro, you may extend this special +# exception to the GPL to apply to your modified version as well. + +#serial 9 + +# mattst88: +# Modified YACC assignment to remove -o y.tab.c since we're writing +# our own .y/.yy rules. +# +# Replaced m4_ifnblank(...) with m4_ifval(m4_normalize(...), ...) +# since m4_ifnblank requires autoconf-2.64. + +AC_DEFUN([AX_PROG_BISON], [ + AC_REQUIRE([AC_PROG_YACC]) + AC_REQUIRE([AC_PROG_EGREP]) + + AC_CACHE_CHECK([if bison is the parser generator],[ax_cv_prog_bison],[ + AS_IF([$YACC --version 2>/dev/null | $EGREP -q '^bison '], + [ax_cv_prog_bison=yes], [ax_cv_prog_bison=no]) + ]) + AS_IF([test "$ax_cv_prog_bison" = "yes"], [ + dnl replace the yacc-compatible compiler with the real bison, as + dnl otherwise autoconf limits us to the POSIX yacc. + dnl We also change the generated filename to the old one, so that + dnl automake's ylwrap can deal with it. + YACC="${YACC% -y}" + ] m4_ifval(m4_normalize([$1]), [[$1]]), + m4_ifval(m4_normalize([$2]), [[$2]]) + ) +]) |