Build by default with optimization level -O2 for GCC

before -O0 was used by default, that caused pretty bad performance.

Amd64, i6700k, 4200MHz, GNU/Linux (non-RT kernel), gcc 7.2.0

-------------------------------------
Optimization | EN/ENO |no EN/ENO |
-------------------------------------
default | 11 | 9.5 |
-O3 | 3.9 | 5.2 |
-O2 | 4 | 4.8 |
-Os | 4.1 | 3.5 |
-Ofast | 3.9 | 5.2 |
-------------------------------------

ARM, BBB Cortex-A8, 600Mhz, GNU/Linux, gcc 4.6.3

-------------------------------------
Optimization | EN/ENO |no EN/ENO |
-------------------------------------
default | 273 | 226 |
-O3 | 141.8 | 106.2 |
-O2 | 142 | 107 |
-Os | 152.5 | 112.2 |
-Ofast | 141.7 | 106.2 |
-------------------------------------

For embedded systems with size constaints (like Cortex-Mx, AVR and so
on) I usually use -Os. It gets pretty good results. For
GNU/Linux-based systems -O2 is usually a good choice, as you see the
test results.

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<?xml version="1.0" encoding="UTF-8" standalone="no"?>

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<PyFile>

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  <variables/>

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  <globals>

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<![CDATA[

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from threading import Thread

     7

     8

def OnConnectButton(self, event):

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  def OnWiiConnected(mac_addr):

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    self.label_2.SetLabel(

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      "Wiimote %s connected"%mac_addr 

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      if mac_addr else 

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      "Wiimote connection failed !")

    14

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  def WiiConnected(mac_addr):

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    wx.CallAfter(OnWiiConnected,mac_addr)

    17

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  Thread(target = Connect_Wiimote, args = (WiiConnected,)).start()

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  self.label_2.SetLabel("Press wiimote 1+2")

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  event.Skip()

    21

    22

def OnDisconnectButton(self, event):

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  Disconnect_Wiimote()

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  self.label_2.SetLabel("Wiimote disconnected")

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  event.Skip()

    26

    27

]]>

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  </globals>

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  <init>

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<![CDATA[

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]]>

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  </init>

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  <cleanup>

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<![CDATA[

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]]>

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  </cleanup>

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  <start>

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<![CDATA[

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]]>

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  </start>

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  <stop>

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<![CDATA[

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]]>

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  </stop>

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</PyFile>