Add extra flag in invariant Makefile to build a non-PIE executable.

Author: NlightNFotis

regression/invariants/Makefile

@@ -10,6 +10,17 @@ OBJ += ../../src/big-int/big-int$(LIBEXT) \
 include ../../src/config.inc
 include ../../src/common
 
+ifeq ($(OS),Windows_NT)
+    detected_OS := Windows
+else
+    detected_OS := $(shell sh -c 'uname 2>/dev/null || echo Unknown')
+endif
+
+ifeq ($(detected_OS),Linux)
+    CFLAGS += "-no-pie"
+	CXXFLAGS += "-no-pie"
+endif
+
 test: driver$(EXEEXT)
 	@../test.pl -e -p -c ../driver