CMake

417 describe how to use codegen (#434) #933

Job	Run time
linux-gnu-shared-ext-log	1m 13s
linux-gnu-shared-ext-nolog	1m 11s
linux-gnu-static-all-test	2m 53s
linux-gnu-shared-all-test	2m 53s
linux-gnu-shared-noext-nolog	1m 11s
linux-clang-shared-ext-log	1m 35s
linux-clang-shared-ext-nolog	1m 45s
linux-clang-static-all-test	3m 49s
linux-clang-shared-all-test	3m 48s
linux-clang-shared-noext-nolog	1m 32s
win-cygwin-shared-ext-log	8m 20s
win-cygwin-shared-ext-nolog	8m 30s
win-cygwin-static-all-test	13m 31s
win-cygwin-shared-all-test	14m 34s
win-cygwin-shared-noext-nolog	9m 10s
win-clang-shared-ext-log	10m 21s
win-clang-shared-ext-nolog	9m 40s
win-clang-static-all-test	8m 11s
win-clang-shared-all-test	13m 48s
win-clang-shared-noext-nolog	9m 17s
win-msvc-shared-ext-log	5m 24s
win-msvc-shared-ext-nolog	5m 6s
win-msvc-static-all-test	7m 16s
win-msvc-shared-all-test	8m 28s
win-msvc-shared-noext-log	5m 40s
win-msvc-shared-noext-nolog	4m 38s
	2h 43m 44s

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