File Make-kokkos-build-reproducible.patch of Package trilinos

From: Egbert Eich <eich@suse.com>
Date: Wed Oct 14 07:25:08 2020 +0200
Subject: Make kokkos build reproducible
Patch-mainline: Not yet
Git-commit: dae04f951684ece236b948050b57b2fca0d0c4bd
References: 

Signed-off-by: Egbert Eich <eich@suse.com>
---
 packages/kokkos/Makefile.kokkos | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/packages/kokkos/Makefile.kokkos b/packages/kokkos/Makefile.kokkos
index 320d398..12f570b 100644
--- a/packages/kokkos/Makefile.kokkos
+++ b/packages/kokkos/Makefile.kokkos
@@ -448,9 +448,14 @@ kokkos_append_header = $(shell echo $1 >> $(KOKKOS_INTERNAL_CONFIG_TMP))
 # 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)")
-tmp := $(call kokkos_append_header,"----------------------------------------------*/")
 
+tmp := $(call kokkos_append_header,"----------------------------------------------*/")
+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,'\#if !defined(KOKKOS_MACROS_HPP) || defined(KOKKOS_CORE_CONFIG_H)')
 tmp := $(call kokkos_append_header,'\#error "Do not include $(KOKKOS_CONFIG_HEADER) directly; include Kokkos_Macros.hpp instead."')
 tmp := $(call kokkos_append_header,'\#else')