replace LDFLAGS with LDLIBS

Reducibility_Multiplex/Makefile

@@ -1,12 +1,40 @@
 CC=gcc
-CFLAGS=-Iinclude -g -O3 
+CFLAGS=-O2 
+LDLIBS=-lm -lgmp -lz
 
 
-all: reducibility
+CC_RUNS=$(shell \$($(CC) --version >/dev/null ))
+
+##$(info $$CC_RUNS is [${CC_RUNS}])
+
+#ifeq ($(CC_RUNS), "")
+ifdef CC_RUNS
+IS_CC_GCC=$(shell $(CC) --version 2>/dev/null | grep -Eic '(GCC)')
+##$(info $$IS_CC_GCC is [${IS_CC_GCC}])
+ifneq ($(IS_CC_GCC), 0)
+# compiler is GCC
+CFLAGS+=-fopenmp
+else
+IS_CC_ICC=$(shell $(CC) --version 2>/dev/null | grep -Eic 'Intel')
+##$(info $$IS_CC_ICC is [${IS_CC_ICC}])
+ifneq ($(IS_CC_ICC), 0)
+# compiler is Intel icc
+CFLAGS+=-qopenmp
+else
+IS_CC_CLANG=$(shell $(CC) --version 2>/dev/null | grep -Eic '(llvm|clang)')
+##$(info $$IS_CC_CLANG is [${IS_CC_CLANG}])
+ifeq ($(IS_CC_CLANG), 1)
+# compiler is CLANG
+LDLIBS+=-lomp
+endif
+endif
+endif
+endif
+all: reducibility_complexity
 
 clean:
 	rm -f reducibility_complexity
 
 reducibility: reducibility_complexity.c
-	$(CC) $(CFLAGS) reducibility_complexity.c  -fopenmp -lm -lgmp -lz -o  reducibility_complexity
+	$(CC) $(CFLAGS) reducibility_complexity.c -o reducibility_complexity