From bug-octave-request at bevo dot che dot wisc dot edu  Mon Sep 29 15:13:48 1997
Subject: Octave dumps core when built in Linux/GNU with GNU libc.
From: "Ram'on Garc'ia Fern'andez" <ramon at juguete dot quim dot ucm dot es>
To: bug-octave at bevo dot che dot wisc dot edu
Date: Mon, 29 Sep 1997 22:12:54 +0200 (CEST)

In Linux systems with libc 6 (GNU libc), octave dumps core at startup.

The reason is that when octave is linked, the arguments -lc -lgcc are
explicitly placed in the command line of c++. This causes these libraries
to be taken before libstdc++. GNU libc and libstdc++ have incompatible
implementations of some objects, like standard streams (GNU libc uses
vtable thunks for interfacing with C++, but libstdc++ cannot since current
versions of the GNU C++ compiler have a broken support of vtable thunks). 

The fix is to avoid -lc -lgcc on the command line. I include here a patch
to aclocal.m4 that prevents these flags to be added in GNU/Linux systems.

Regards,
	Ramon


--- octave-2.0.9/aclocal.m4.orig	Wed Jul  9 00:54:17 1997
+++ octave-2.0.9/aclocal.m4	Mon Sep 29 05:19:37 1997
 at @ -120,9 +120,15 @@
       -l*)
 	if test x$arg = x-lang-c++; then
 	  arg=
-        else
-          lflags="$lflags $arg"
 	fi
+	case "$target_host_type" in
+	    *linux*)
+		if test x$arg = x-lc -o x$arg = x-lgcc; then
+		  arg=
+		fi
+		;;
+	esac
+        lflags="$lflags $arg"
       ;;
       -u)
         want_arg=$arg
 at @ -256,15 +262,26 @@
 	  else
 	    case "$arg" in
 	      -lkernel32)
-		case "$canonical_host_type" in
+		case "$target_host_type" in
 		  *-*-cygwin32)
 		  ;;
 		  *)
 		    lflags="$lflags $arg"
 		  ;;
 		esac
+              ;;
+	      -lm)
 	      ;;
-	      -lm | -lc)
+	      -lc | -lgcc)
+		case "$target_host_type" in
+                  *-*linux*)
+	          arg=
+                  ;;
+		*) if test "$arg" = "-lgcc"; then
+		    lflags="$lflags $arg"
+                   fi
+		  ;;
+		esac
 	      ;;
 	      *)
 		lflags="$lflags $arg"