MSVC has a '-O2' compiler optimization flag which makes code run
fast and is the recommended option for released code. For e.g.,
running "./tests/ovstest.exe test-cmap benchmark
1000000 3 1"
shows a 3x improvement for some cmap micro-benchmarks.
In the Visual Studio world, there is a concept of "release" build
(fast code, harder to debug) and a "debug" build (easier to debug).
The IDE provides this option and the IDE users expect something similar
for command line build.
So this commit, introduces a "--with-debug" configure option for Windows
and does not use '-O2' as a compiler option when specified. This can
be extended further if there are more compiler options that distinguish
a "release" build vs "debug" build.
Signed-off-by: Gurucharan Shetty <gshetty@nicira.com>
Acked-by: Saurabh Shah <ssaurabh@vmware.com>
--prefix="C:/openvswitch/usr" --localstatedir="C:/openvswitch/var" \
--sysconfdir="C:/openvswitch/etc" --with-pthread="C:/pthread"
+ By default, the above enables compiler optimization for fast code.
+ For default compiler optimization, pass the "--with-debug" configure
+ option.
+
* Run make for the ported executables in the top source directory, e.g.:
% make
AM_CPPFLAGS += -I $(top_srcdir)/include/windows
AM_CPPFLAGS += -I $(top_srcdir)/datapath-windows/include
AM_CPPFLAGS += $(PTHREAD_INCLUDES)
+AM_CPPFLAGS += $(MSVC_CFLAGS)
AM_LDFLAGS += $(PTHREAD_LDFLAGS)
endif
linkopt="$linkopt ${slash}DEBUG"
;;
+ -O0)
+ clopt="$clopt ${slash}Ot"
+ ;;
+
+ -O2)
+ clopt="$clopt ${slash}O2"
+ ;;
+
-L*)
path=`echo "$1" | sed 's/-L//'`
linkopt="$linkopt ${slash}LIBPATH:$path"
AC_MSG_ERROR([pthread directory not specified])
]
)
+ AC_ARG_WITH([debug],
+ [AS_HELP_STRING([--with-debug],
+ [Build without compiler optimizations])],
+ [
+ MSVC_CFLAGS="-O0"
+ AC_SUBST([MSVC_CFLAGS])
+ ], [
+ MSVC_CFLAGS="-O2"
+ AC_SUBST([MSVC_CFLAGS])
+ ]
+ )
AC_DEFINE([WIN32], [1], [Define to 1 if building on WIN32.])
AH_BOTTOM([#ifdef WIN32