File reproducible.patch of Package trilinos

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File reproducible.patch of Package trilinos (Revision 4fdb283381974673a5179aaf8ad40e2e)

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https://github.com/trilinos/Trilinos/pull/7814

commit 8012a23c0bbc10d585a978159c952066ce5d485f
Author: Bernhard M. Wiedemann <bwiedemann@suse.de>
Date:   Sun Aug 9 21:24:11 2020 +0200

Allow to override build date with SOURCE_DATE_EPOCH
in order to make builds reproducible.
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 date call is designed to work with all variants of date.

Also use UTC to be independent of timezone.

As an alternative, the date could be dropped to reduce complexity.

This PR was done while working on reproducible builds for openSUSE.

diff --git a/packages/kokkos/Makefile.kokkos b/packages/kokkos/Makefile.kokkos
index 5c0e91f1..3b7d3cf6 100644
--- a/packages/kokkos/Makefile.kokkos
+++ b/packages/kokkos/Makefile.kokkos
@@ -364,7 +364,12 @@ KOKKOSHASH=\#
 # Do not append first line
 tmp := $(shell echo "/* ---------------------------------------------" > KokkosCore_config.tmp)
 tmp := $(call kokkos_append_header,"Makefile constructed configuration:")
-tmp := $(call kokkos_append_header,"$(shell date)")
+ifdef SOURCE_DATE_EPOCH
+    BUILD_DATE ?= $(shell date -u -d "@$(SOURCE_DATE_EPOCH)" 2>/dev/null || date -u -r "$(SOURCE_DATE_EPOCH)" 2>/dev/null || date -u)
+else
+    BUILD_DATE ?= $(shell date)
+endif
+tmp := $(call kokkos_append_header,"$(BUILD_DATE)")
 tmp := $(call kokkos_append_header,"----------------------------------------------*/")
 
 tmp := $(call kokkos_append_header,'$(KOKKOSHASH)if !defined(KOKKOS_MACROS_HPP) || defined(KOKKOS_CORE_CONFIG_H)')

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File reproducible.patch of Package trilinos (Revision 4fdb283381974673a5179aaf8ad40e2e)

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