standardize warning flags everywhere

I'd like to enable -Wextra as well, but that creates some false
positives.

I've at least made my changes clean w.r.t. -Wextra.

Now we have 4 remaining warnings with gcc 9.3 that seem genuine. Need to
fix those.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/Makefile b/src/Makefile
index 45f3b41..1d36c93 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -8,7 +8,7 @@
 PLAT= none
 
 CC= gcc
-CFLAGS= -g -O2 -Wall -Wpedantic $(MYCFLAGS)
+CFLAGS= -g -O2 -Wall -Wpedantic -Wshadow $(MYCFLAGS)
 AR= ar rc
 RANLIB= ranlib
 RM= rm -f