Re: libtool.m4 usage of diff when comparing files

[Alfred M. Szmidt]

Sorry, the previous patch was munged, here is the correct one.

diff -ur libltdl/m4/libtool.m4 libltdl/m4/libtool.m4.~1~
--- libltdl/m4/libtool.m4       2010-04-24 19:35:27.074101220 +0200
+++ libltdl/m4/libtool.m4.~1~   2009-11-16 14:11:59.000000000 +0100
@@ -1426,7 +1426,7 @@
      # So say no if there are warnings other than the usual output.
      $ECHO "X$_lt_compiler_boilerplate" | $Xsed -e '/^$/d' >conftest.exp
      $SED '/^$/d; /^ *+/d' conftest.err >conftest.er2
-     if test ! -s conftest.er2 || cmp conftest.exp conftest.er2 >/dev/null; 
then
+     if test ! -s conftest.er2 || diff conftest.exp conftest.er2 >/dev/null; 
then
        $2=yes
      fi
    fi
@@ -1466,7 +1466,7 @@
        cat conftest.err 1>&AS_MESSAGE_LOG_FD
        $ECHO "X$_lt_linker_boilerplate" | $Xsed -e '/^$/d' > conftest.exp
        $SED '/^$/d; /^ *+/d' conftest.err >conftest.er2
-       if cmp conftest.exp conftest.er2 >/dev/null; then
+       if diff conftest.exp conftest.er2 >/dev/null; then
          $2=yes
        fi
      else
@@ -1880,7 +1880,7 @@
      # So say no if there are warnings
      $ECHO "X$_lt_compiler_boilerplate" | $Xsed -e '/^$/d' > out/conftest.exp
      $SED '/^$/d; /^ *+/d' out/conftest.err >out/conftest.er2
-     if test ! -s out/conftest.er2 || cmp out/conftest.exp out/conftest.er2 
>/dev/null; then
+     if test ! -s out/conftest.er2 || diff out/conftest.exp out/conftest.er2 
>/dev/null; then
        _LT_TAGVAR(lt_cv_prog_compiler_c_o, $1)=yes
      fi
    fi