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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all:

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	@echo "Please specify target 'source_list', 'template' or 'locales'"

     3

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template:

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	@echo To generate translation template message.pot file:

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	python mki18n.py -p --domain=Beremiz

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locales:

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	@echo "Generate .mo files for all languages:"

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	python mki18n.py -m --moTarget=../locale --domain=Beremiz

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source_list:

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	echo @To "Generate list with source files: app.fil:"

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	find .. -name "*.py" -exec grep -q '_(' {} ';' -print -o -name "*XSD*" -print -o -name "*.csv" -print | grep -v '/build/' | grep -v '/pyjs/' > app.fil

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	echo "../plcopen/Additional_Function_Blocks.xml" >> app.fil

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	echo "../plcopen/Standard_Function_Blocks.xml"   >> app.fil

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.PHONY: all, template, locales, source_list