[newlib-cygwin] Cygwin: cygserver: build with -Wimplicit-fallthrough=4 -Werror

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=c8dc3fa0ba5543d69300040acabe751fc3ec7cb5

commit c8dc3fa0ba5543d69300040acabe751fc3ec7cb5
Author: Corinna Vinschen <corinna@vinschen.de>
Date:   Fri Aug 7 12:33:38 2020 +0200

    Cygwin: cygserver: build with -Wimplicit-fallthrough=4 -Werror
    
    Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

Diff:
---
 winsup/cygserver/Makefile.in | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/winsup/cygserver/Makefile.in b/winsup/cygserver/Makefile.in
index 16a2ccc15..bbdfc25fb 100644
--- a/winsup/cygserver/Makefile.in
+++ b/winsup/cygserver/Makefile.in
@@ -16,7 +16,7 @@ export CXX:=@CXX@
 
 CFLAGS:=@CFLAGS@
 override CXXFLAGS=@CXXFLAGS@
-override CXXFLAGS+=-MMD -D__OUTSIDE_CYGWIN__ -DSYSCONFDIR="\"$(sysconfdir)\""
+override CXXFLAGS+=-MMD -Wimplicit-fallthrough=4 -Werror -D__OUTSIDE_CYGWIN__ -DSYSCONFDIR="\"$(sysconfdir)\""
 
 include ${srcdir}/../Makefile.common