using env variables to set compilers

Change-Id: I9af812c4528d0f14c4318436c74a0c63e25d0527


[ROCm/roctracer commit: 807bd250f6]

projects/roctracer/test/MatrixTranspose_test/Makefile

@@ -18,7 +18,7 @@ OBJECTS = MatrixTranspose.o
 FLAGS =-g -I$(ROOT_PATH) -I$(ROOT_PATH)/inc -I${ROCM_INC_PATH}/hsa -I${ROCM_INC_PATH} -DLOCAL_BUILD=1 -DHIP_VDI=${HIP_VDI} -DITERATIONS=$(ITERATIONS) -DAMD_INTERNAL_BUILD=1
 
 ifeq ($(C_TEST), 1)
-	COMP=gcc
+	COMP=${CC}
 	SOURCES = MatrixTranspose.c
 	FLAGS += -DHIP_TEST=0 -D__HIP_PLATFORM_HCC__=1 -I${ROCM_INC_PATH}/hcc
 else