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make build reproducible

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by allowing build systems to use a constant date instead of the current one
see https://reproducible-builds.org/ for why this is good
and https://reproducible-builds.org/specs/source-date-epoch/
for the definition of this variable

This call is designed to work with GNU date. If BSD support is a concern, it can be added.
This commit is contained in:
Bernhard M. Wiedemann 2017-01-22 16:54:24 +00:00 committed by Armin Novak
parent 14d076735e
commit 3606a42c52
1 changed files with 5 additions and 1 deletions
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6
cmake/today.cmake
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@ -7,7 +7,11 @@ MACRO (TODAY RESULT)
EXECUTE_PROCESS(COMMAND "cmd" " /C date +%Y-%m-%d" OUTPUT_VARIABLE ${RESULT})
string(REGEX REPLACE "(..)/(..)/..(..).*" "\\1/\\2/\\3" ${RESULT} ${${RESULT}})
ELSEIF(UNIX)
EXECUTE_PROCESS(COMMAND "date" "+%Y-%m-%d" OUTPUT_VARIABLE ${RESULT})
if (DEFINED ENV{SOURCE_DATE_EPOCH})
EXECUTE_PROCESS(COMMAND "date" "-u" "-d" "@$ENV{SOURCE_DATE_EPOCH}" "+%Y-%m-%d" OUTPUT_VARIABLE ${RESULT})
else ()
EXECUTE_PROCESS(COMMAND "date" "+%Y-%m-%d" OUTPUT_VARIABLE ${RESULT})
endif ()
string(REGEX REPLACE "(..)/(..)/..(..).*" "\\1/\\2/\\3" ${RESULT} ${${RESULT}})
ELSE (WIN32)
MESSAGE(SEND_ERROR "date not implemented")