ofp-parse: Fix GCC compiler warnings with -O3.

When compiling with -O3, GCC can no longer tell that the following
warnings are not valid.  At any rate, they're easy enough to silence.

ofp-parse.c:764:45: error: 'ttl' may be used uninitialized in this
function

ofp-parse.c:752:17: error: 'ecn' may be used uninitialized in this
function

Signed-off-by: Ethan Jackson <ethan@nicira.com>
Acked-by: Jarno Rajahalme <jrajahalme@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>
ovs-dev.py: Add "-fno-omit-frame-pointer" compiler argument.

This makes it easier for development tools including "perf", give
clean backtraces on x86-64 systems.

Signed-off-by: Ethan Jackson <ethan@nicira.com>
Acked-by: Jarno Rajahalme <jrajahalme@nicira.com>
ovs-dev.py:  Add compiler optimization options.

Signed-off-by: Ethan Jackson <ethan@nicira.com>
Acked-by: Jarno Rajahalme <jrajahalme@nicira.com>
ovs-dev.py: Configure silently.

Signed-off-by: Ethan Jackson <ethan@nicira.com>
Acked-by: Joe Stringer <joestringer@nicira.com>
configure: Enable silent rules.

Configure has an option which supports quieter compilation.

Signed-off-by: Ethan Jackson <ethan@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>
Acked-by: Joe Stringer <joestringer@nicira.com>
Makefile: Use AM_V_GEN instead of echo.

The AM_V_GEN macro fits more cleanly with the automake silent rules
option.  When enabled it will print "GEN <filename>" instead of simply
echoing the command as before.

Signed-off-by: Ethan Jackson <ethan@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>