From: Bernhard M. Wiedemann <redacted>
Date: Fri, 24 Jan 2025 11:21:35 +0000 (+0100)
Subject: cmake : avoid -march=native when reproducible build is wanted (#11366)
X-Git-Tag: upstream/0.0.4631~89
X-Git-Url: https://git.djapps.eu/?a=commitdiff_plain;h=1af6945eb0d0e97525dc0ec18167abf05c28f482;p=pkg%2Fggml%2Fsources%2Fllama.cpp

cmake : avoid -march=native when reproducible build is wanted (#11366)

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.

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

Fixes: #11317

This patch was done while working on reproducible builds for openSUSE.
---

diff --git a/ggml/CMakeLists.txt b/ggml/CMakeLists.txt
index 185079aa..ff68ddc2 100644
--- a/ggml/CMakeLists.txt
+++ b/ggml/CMakeLists.txt
@@ -58,7 +58,8 @@ else()
     set(GGML_BLAS_VENDOR_DEFAULT "Generic")
 endif()
 
-if (CMAKE_CROSSCOMPILING)
+if (CMAKE_CROSSCOMPILING OR DEFINED ENV{SOURCE_DATE_EPOCH})
+    message(STATUS "Setting GGML_NATIVE_DEFAULT to OFF")
     set(GGML_NATIVE_DEFAULT OFF)
 else()
     set(GGML_NATIVE_DEFAULT ON)