File reproducible.patch of Package pgvector

From a2c6813aa0cfca83d6de93aad61a0e2cae084aee Mon Sep 17 00:00:00 2001
From: "Bernhard M. Wiedemann" <bwiedemann@suse.de>
Date: Fri, 24 Jan 2025 04:10:21 +0100
Subject: [PATCH] Avoid -march=native when reproducible build is wanted

See https://reproducible-builds.org/ for why this is good.

Without this patch, compiling on different machines produced different binaries, which made verification of results difficult.

This patch was done while working on reproducible builds for openSUSE.
---
 Makefile | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 7a4b88ca..4681d0f7 100644
--- a/Makefile
+++ b/Makefile
@@ -12,7 +12,11 @@ REGRESS = $(patsubst test/sql/%.sql,%,$(TESTS))
 REGRESS_OPTS = --inputdir=test --load-extension=$(EXTENSION)
 
 # To compile for portability, run: make OPTFLAGS=""
-OPTFLAGS = -march=native
+ifdef SOURCE_DATE_EPOCH
+	OPTFLAGS =
+else
+	OPTFLAGS = -march=native
+endif
 
 # Mac ARM doesn't always support -march=native
 ifeq ($(shell uname -s), Darwin)