cccl: Ability to enable compiler optimization.

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>

1 files changed, 8 insertions, 0 deletions

diff --git a/build-aux/cccl b/build-aux/cccl
index c18629af6..1a06e3878 100644
--- a/build-aux/cccl
+++ b/build-aux/cccl
@@ -89,6 +89,14 @@ EOF
         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"