patch 8.1.0419: Cygwin: running cproto fails with -O2
Problem: Cygwin: running cproto fails with -O2.
Solution: Strip -O2 for cproto. (Ken Takata, closes #3465)
diff --git a/src/Makefile b/src/Makefile
index 9c19281..5b25e03 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -2028,8 +2028,9 @@
# them as a list of individual flags.
# The -E"gcc -E" argument must be separate to avoid problems with shell
# quoting.
+# Strip -O2, it may cause cproto to write stderr to the file "2".
CPROTO = cproto $(PROTO_FLAGS) -DPROTO \
- `echo '$(LINT_CFLAGS)' | sed -e 's/ -[a-z-]\+//g'`
+ `echo '$(LINT_CFLAGS)' | sed -e 's/ -[a-z-]\+//g' -e 's/ -O[^ ]\+//g'`
### Would be nice if this would work for "normal" make.
### Currently it only works for (Free)BSD make.