doc: contrib/local.mk.example: include ENABLE_LTO (#11097)

Using it takes 30+ additional seconds for me with a ccache-enabled build
(43s vs. 12s).

While it certainly makes sense to use DEBUG during development,
bisecting etc, it should be made clearer what causes this.
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Daniel Hahler 2019-09-26 23:43:49 +02:00 committed by GitHub
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@ -25,6 +25,12 @@
#
# CMAKE_BUILD_TYPE := Debug
# With non-Debug builds interprocedural optimization (IPO) (which includes
# link-time optimization (LTO)) is enabled by default, which causes the link
# step to take a significant amout of time, which is relevant when building
# often. You can disable it explicitly:
# CMAKE_EXTRA_FLAGS += -DENABLE_LTO=OFF
# Log levels: 0 (DEBUG), 1 (INFO), 2 (WARNING), 3 (ERROR)
# Default is 1 (INFO) unless CMAKE_BUILD_TYPE is Release or RelWithDebInfo.
# CMAKE_EXTRA_FLAGS += -DMIN_LOG_LEVEL=1