libtool: use -Fe with MSVC to specify filename

This avoids a deprecation warning with current versions of MSVC, by
replacing the -o flag with -Fe. -Fe is documented as supported at
least as far back as Visual C 6.0 which was released in 1998.

* m4/libtool.m4: Use -Fe instead of -o to specify DLL output filename
for MSVC.

Signed-off-by: Olly Betts <olly@survex.com>

diff --git a/m4/libtool.m4 b/m4/libtool.m4
index 23a68497a964179f86cf4945ba0f7d508de6dd63..64df9b55d1fad0217db49d681d90b4907b87288e 100644 (file)
--- a/m4/libtool.m4
+++ b/m4/libtool.m4
@@ -5598,14 +5598,14 @@ _LT_EOF
        # Tell ltmain to make .dll files, not .so files.
        shrext_cmds=.dll
        # FIXME: Setting linknames here is a bad hack.
-       _LT_TAGVAR(archive_cmds, $1)='$CC -o $output_objdir/$soname $libobjs $compiler_flags $deplibs -Wl,-DLL,-IMPLIB:"$tool_output_objdir$libname.dll.lib"~linknames='
+       _LT_TAGVAR(archive_cmds, $1)='$CC -Fe $output_objdir/$soname $libobjs $compiler_flags $deplibs -Wl,-DLL,-IMPLIB:"$tool_output_objdir$libname.dll.lib"~linknames='
        _LT_TAGVAR(archive_expsym_cmds, $1)='if _LT_DLL_DEF_P([$export_symbols]); then
             cp "$export_symbols" "$output_objdir/$soname.def";
             echo "$tool_output_objdir$soname.def" > "$output_objdir/$soname.exp";
           else
             $SED -e '\''s/^/-link -EXPORT:/'\'' < $export_symbols > $output_objdir/$soname.exp;
           fi~
-          $CC -o $tool_output_objdir$soname $libobjs $compiler_flags $deplibs "@$tool_output_objdir$soname.exp" -Wl,-DLL,-IMPLIB:"$tool_output_objdir$libname.dll.lib"~
+          $CC -Fe $tool_output_objdir$soname $libobjs $compiler_flags $deplibs "@$tool_output_objdir$soname.exp" -Wl,-DLL,-IMPLIB:"$tool_output_objdir$libname.dll.lib"~
           linknames='
        # The linker will not automatically build a static lib if we build a DLL.
        # _LT_TAGVAR(old_archive_from_new_cmds, $1)='true'