a libtool.m4 patch for use with autoconf-2.50

[Bruno Haible]

Hi,

The libtool.m4 from libtool-1.4 doesn't work perfectly with autoconf-2.50:
the "-o file.lo" test reports "no" instead of "yes" as it did with
autoconf-2.13. config.log shows the following lines:

configure:3952: checking if gcc supports -c -o file.lo
configure:3974: gcc -c -g -O2 -c -o conftest.lo  conftest.c >&5
configure:3977: $? = 0
configure:3980: test -s conftest.o
configure:3983: $? = 1

It is wrong to expect the existence of conftest.o after using "-o conftest.lo".

Here is a fix. It also fixes that the result of this test is not displayed,
a simple typo.

*** libtool.m4.bak      Fri Jun  8 23:54:45 2001
--- libtool.m4  Thu Jun 14 13:26:54 2001
***************
*** 1066,1071 ****
--- 1066,1073 ----
    lt_cv_compiler_o_lo=no
    save_CFLAGS="$CFLAGS"
    CFLAGS="$CFLAGS -c -o conftest.lo"
+   save_objext="$ac_objext"
+   ac_objext=lo
    AC_TRY_COMPILE([], [int some_variable = 0;], [dnl
      # The compiler can only warn and ignore the option if not recognized
      # So say no if there are warnings
***************
*** 1075,1084 ****
        lt_cv_compiler_o_lo=yes
      fi
    ])
    CFLAGS="$save_CFLAGS"
    ])
    compiler_o_lo=$lt_cv_compiler_o_lo
!   AC_MSG_RESULT([$compiler_c_lo])
  else
    compiler_o_lo=no
  fi
--- 1077,1087 ----
        lt_cv_compiler_o_lo=yes
      fi
    ])
+   ac_objext="$save_objext"
    CFLAGS="$save_CFLAGS"
    ])
    compiler_o_lo=$lt_cv_compiler_o_lo
!   AC_MSG_RESULT([$compiler_o_lo])
  else
    compiler_o_lo=no
  fi