From 1597d2f886f75c1b9b90872d7fc7a9dbfb93701c Mon Sep 17 00:00:00 2001
From: Alexey Milovidov <milovidov@yandex-team.ru>
Date: Tue, 12 Oct 2021 03:30:08 +0300
Subject: [PATCH] Hermetic builds

---
 PreLoad.cmake | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/PreLoad.cmake b/PreLoad.cmake
index 0a25a55e7bf..be911bd9267 100644
--- a/PreLoad.cmake
+++ b/PreLoad.cmake
@@ -18,3 +18,20 @@ if (NOT DEFINED ENV{CLION_IDE} AND NOT DEFINED ENV{XCODE_IDE})
         set(CMAKE_GENERATOR "Ninja" CACHE INTERNAL "" FORCE)
     endif ()
 endif()
+
+
+# Default toolchain - this is needed to avoid dependency on OS files.
+execute_process(COMMAND uname -s OUTPUT_VARIABLE OS)
+execute_process(COMMAND uname -m OUTPUT_VARIABLE ARCH)
+
+if (OS MATCHES "Linux" AND NOT DEFINED CMAKE_TOOLCHAIN_FILE)
+    if (ARCH MATCHES "amd64|x86_64")
+        set (CMAKE_TOOLCHAIN_FILE "cmake/linux/toolchain-x86_64.cmake" CACHE INTERNAL "" FORCE)
+    elseif (ARCH MATCHES "^(aarch64.*|AARCH64.*|arm64.*|ARM64.*)")
+        set (CMAKE_TOOLCHAIN_FILE "cmake/linux/toolchain-aarch64.cmake" CACHE INTERNAL "" FORCE)
+    elseif (ARCH MATCHES "^(ppc64le.*|PPC64LE.*)")
+        set (CMAKE_TOOLCHAIN_FILE "cmake/linux/toolchain-ppc64le.cmake" CACHE INTERNAL "" FORCE)
+    else ()
+        message (FATAL_ERROR "Unsupported architecture: ${ARCH}")
+    endif ()
+endif()