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PR #1715: Generate options.h using CMake only once
Imported from GitHub PR https://github.com/abseil/abseil-cpp/pull/1715
Using abseil via CMake ExternalProject, for each compilation abseil is reconfigured. This leads to a new options-pinned.h generated and then a new options.h installed. Because of that new options.h file, all projects depending on abseil recompile entirely.
Using file(GENERATE ...) instead of file(WRITE ...) allows generating options-pinned.h only when the content is new or changed.
Merge b3b53860d1f6cc83283806117cd5d341159b6052 into cd75cb4ae32c46c84cef9a9c78b42174f22ed0ac
Merging this change closes #1715
COPYBARA_INTEGRATE_REVIEW=https://github.com/abseil/abseil-cpp/pull/1715 from BotellaA:patch-1 b3b53860d1f6cc83283806117cd5d341159b6052
PiperOrigin-RevId: 652495570
Change-Id: Ib14bd9a78f80a540aae73d7a94cb46e2c05e8509