make: allow to overwrite CFLAGS, CCACHE

Allow to define custom compile flags, e.g. ...

  make CFLAGS="-O2 -Wall"

... and also allow to overwrite ccache variable:

  make CCACHE= all

Also do some minor fixes when built with -O2 -Wall.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/pcap_io.h b/pcap_io.h
index a491f39..64689af 100644
--- a/pcap_io.h
+++ b/pcap_io.h
@@ -132,9 +132,9 @@ struct pcap_file_ops {
 	void (*fsync_pcap)(int fd);
 };
 
-extern const struct pcap_file_ops pcap_rw_ops;
-extern const struct pcap_file_ops pcap_sg_ops;
-extern const struct pcap_file_ops pcap_mm_ops;
+extern const struct pcap_file_ops pcap_rw_ops __maybe_unused;
+extern const struct pcap_file_ops pcap_sg_ops __maybe_unused;
+extern const struct pcap_file_ops pcap_mm_ops __maybe_unused;
 
 static inline uint16_t tp_to_pcap_tsource(uint32_t status)
 {