Allow using Intel SDE for PGO builds.

The software development emulator (SDE) allows to run binaries compiled
for architectures not supported by the actual CPU. This is useful to
do PGO builds for newer architectures. The SDE can currently be obtained from
https://software.intel.com/content/www/us/en/develop/articles/intel-software-development-emulator.html

This patch introduces a new optional makefile argument SDE_PATH.
If not empty it should contain the path to the sde executable

closes https://github.com/official-stockfish/Stockfish/pull/3373

No functional change.

diff --git a/src/Makefile b/src/Makefile
index eb32758f98de016e6fa795ade98f47103646558d..cdd2007fd2b1f1724b82da4f87fcd0ba2bcfc602 100644 (file)
--- a/src/Makefile
+++ b/src/Makefile
@@ -31,7 +31,11 @@ PREFIX = /usr/local
 BINDIR = $(PREFIX)/bin
 
 ### Built-in benchmark for pgo-builds
-PGOBENCH = ./$(EXE) bench
+ifeq ($(SDE_PATH),)
+       PGOBENCH = ./$(EXE) bench
+else
+       PGOBENCH = $(SDE_PATH) -- ./$(EXE) bench
+endif
 
 ### Source and object files
 SRCS = benchmark.cpp bitbase.cpp bitboard.cpp endgame.cpp evaluate.cpp main.cpp \