Test and fix the #line outputs.

* tests/atlocal.at (GCC): New.
* tests/synclines.at (AT_TEST_SYNCLINE): New macro.
(Prologue synch line, ,%union synch line, Postprologue synch line)
(Action synch line, Epilogue synch line): New tests.
* src/reader.c (parse_union_decl): Define the muscle stype_line.
* data/bison.simple, data/bison.c++: Use it.

tests/Makefile.am

@@ -47,7 +47,8 @@ TESTSUITE_AT = \
 	testsuite.at \
 	input.at \
 	output.at sets.at reduce.at \
-	headers.at actions.at conflicts.at calc.at \
+	synclines.at headers.at actions.at conflicts.at \
+	calc.at \
         torture.at regression.at \
         semantic.at
 

tests/atlocal.in

@@ -8,3 +8,6 @@ CFLAGS='@CFLAGS@ @WARNING_CFLAGS@ @WERROR_CFLAGS@'
 
 # We need `config.h'.
 CPPFLAGS="-I$abs_top_builddir @CPPFLAGS@"
+
+# Is the compiler GCC?
+GCC='@GCC@'

tests/synclines.at

@@ -0,0 +1,120 @@
+# Executing Actions.                               -*- Autotest -*-
+# Copyright 2002 Free Software Foundation, Inc.
+
+# 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, 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, write to the Free Software
+# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+# 02111-1307, USA.
+
+AT_BANNER([[User Actions.]])
+
+# AT_TEST_SYNCLINE(TITLE, INPUT, ERROR-MSG)
+# -----------------------------------------
+# Check that compiling the parser produced from INPUT cause GCC
+# to issue ERROR-MSG.
+m4_define([AT_TEST_SYNCLINE],
+[AT_SETUP([$1])
+
+# I'm not sure I can find a generic scheme to check the location
+# of an error, so we keep this for GCC only.
+AT_CHECK([test "$GCC" = yes || exit 77])
+
+AT_DATA([[input.y]],
+[$2])
+
+AT_CHECK([bison input.y -o input.c])
+AT_CHECK([$CC $CFLAGS $CPPFLAGS input.c -o input], 1, [], [$3])
+AT_CLEANUP
+])
+
+
+## --------------------- ##
+## Prologue synch line.  ##
+## --------------------- ##
+
+
+AT_TEST_SYNCLINE([Prologue synch line],
+[[%{
+#error "2"
+%}
+%%
+exp: '0';
+]],
+[input.y:2: #error "2"
+])
+
+
+## ------------------- ##
+## %union synch line.  ##
+## ------------------- ##
+
+AT_TEST_SYNCLINE([%union synch line],
+[[%union {
+#error "2"
+}
+%%
+exp: '0';
+]],
+[input.y:2: #error "2"
+])
+
+
+## ------------------------- ##
+## Postprologue synch line.  ##
+## ------------------------- ##
+
+AT_TEST_SYNCLINE([Postprologue synch line],
+[[%{
+/* Nothing here. */
+%}
+%union
+{
+  int ival;
+}
+%{
+#error "9"
+%}
+%%
+exp: '0';
+]],
+[input.y:9: #error "9"
+])
+
+
+## ------------------- ##
+## Action synch line.  ##
+## ------------------- ##
+
+AT_TEST_SYNCLINE([Action synch line],
+[[%%
+exp:
+{
+#error "4"
+};
+]],
+[input.y:4: #error "4"
+])
+
+
+## --------------------- ##
+## Epilogue synch line.  ##
+## --------------------- ##
+
+AT_TEST_SYNCLINE([Epilogue synch line],
+[[%%
+exp: '0';
+%%
+#error "4"
+]],
+[input.y:4: #error "4"
+])

tests/testsuite.at

@@ -37,6 +37,9 @@ m4_include([sets.at])
 # Testing grammar reduction.
 m4_include([reduce.at])
 
+# Testing that #lines are correct.
+m4_include([synclines.at])
+
 # Testing that headers are sane.
 m4_include([headers.at])