* src/parse-gram.y (lloc_default): Rewrite to avoid compiler bug.

* configure.ac (AC_PREREQ): Bump to 2.58.

diff --git a/ChangeLog b/ChangeLog
index e536978..b772faf 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,12 @@
+2004-05-27  Paul Eggert  <eggert@cs.ucla.edu>
+
+       * src/parse-gram.y (lloc_default): Rewrite to avoid compiler bug
+       in SGI MIPSpro 7.4.1m.  Problem reported by Albert Chin-A-Young in
+       <http://mail.gnu.org/archive/html/bug-bison/2004-05/msg00037.html>.
+
+       * configure.ac (AC_PREREQ): Bump to 2.58, since 2.57 doesn't work
+       (it fails with a Autoconf-without-aclocal-m4 diagnostic).
+
 2004-05-26  Paul Eggert  <eggert@cs.ucla.edu>
 
        * configure.ac (AM_GNU_GETTEXT_VERSION): Lower it from 0.14.1 to

diff --git a/configure.ac b/configure.ac
index 1160621..34d1c6b 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -17,8 +17,9 @@
 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
 # 02111-1307  USA
 
-# We need a recent Autoconf to run a recent Autotest.
-AC_PREREQ(2.57)
+# We need a recent Autoconf to avoid the message
+# "autom4te: unknown language: Autoconf-without-aclocal-m4".
+AC_PREREQ(2.58)
 
 AC_INIT([GNU Bison], [1.875e], [bug-bison@gnu.org])
 AC_CONFIG_AUX_DIR([config])

diff --git a/src/parse-gram.y b/src/parse-gram.y
index fa35eb6..0f81bf1 100644 (file)
--- a/src/parse-gram.y
+++ b/src/parse-gram.y
@@ -443,7 +443,11 @@ lloc_default (YYLTYPE const *rhs, int n)
 {
   int i;
   YYLTYPE loc;
-  loc.start = loc.end = rhs[n].end;
+
+  /* SGI MIPSpro 7.4.1m miscompiles "loc.start = loc.end = rhs[n].end;".
+     The bug is fixed in 7.4.2m, but play it safe for now.  */
+  loc.start = rhs[n].end;
+  loc.end = rhs[n].end;
 
   /* Ignore empty nonterminals the start of the the right-hand side.
      Do not bother to ignore them at the end of the right-hand side,