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record the timestamp on first configure (#4799)

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Summary:
cmake doesn't re-generate the timestamp on subsequent builds causing rebuilds of the lib

This improves compile time turn-arounds if you have rocksdb as a compileable library include, since with the state its now it will re-generate the time stamp .cc file each time you build, and thus re-compile + re-link the rocksdb library though anything in the source actually changed.
The original timestamp is recorded into `CMakeCache.txt` and will remain there until you flush this cache.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4799

Differential Revision: D17290040

fbshipit-source-id: 28357fef3422693c9c19e88fa2873c8db0f662ed
This commit is contained in:
Wilfried Goesgens 2019-09-11 17:58:34 -07:00 committed by Facebook Github Bot
parent dd2a35f13f
commit fcda80fc33
1 changed files with 2 additions and 1 deletions
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3
CMakeLists.txt
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@ -135,7 +135,8 @@ else()
endif()
endif()
string(TIMESTAMP GIT_DATE_TIME "%Y/%m/%d %H:%M:%S" UTC)
string(TIMESTAMP TS "%Y/%m/%d %H:%M:%S" UTC)
set(GIT_DATE_TIME "${TS}" CACHE STRING "the time we first built rocksdb")
find_package(Git)