Avoid deprecation warning with MSVC

[Olly Betts]

Using -Fe instead of -o avoids the warning and should be OK with older
versions too (the MSVS 2008 docs list -Fe).

Cheers,
    Olly

From 0d1a97460cf14d2574db4749f7bf4c2145035c07 Mon Sep 17 00:00:00 2001
From: Olly Betts <o...@survex.com>
Date: Wed, 24 Jan 2018 14:09:23 +1300
Subject: [PATCH] Use -Fe with MSVC to specify DLL output filename

This avoids a deprecation warning with current versions of MSVC, and
is documented as supported at least as far back as MSVS 2008.

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

Signed-off-by: Olly Betts <o...@survex.com>
---
 m4/libtool.m4 | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/m4/libtool.m4 b/m4/libtool.m4
index 597c6042..6861bc38 100644
--- a/m4/libtool.m4
+++ b/m4/libtool.m4
@@ -5594,14 +5594,14 @@ _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'
-- 
2.15.1

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