Merge pull request #2626 from docularxu/working-gcc-version-detections

make GCC version detection OS-independent

Makefile.system

@@ -277,6 +277,15 @@ NO_LAPACK = 1
 override FEXTRALIB = 
 endif
 
+ifeq ($(C_COMPILER), GCC)
+GCCVERSIONGTEQ4 := $(shell expr `$(CC) -dumpversion | cut -f1 -d.` \>= 4)
+GCCVERSIONGT4 := $(shell expr `$(CC) -dumpversion | cut -f1 -d.` \> 4)
+GCCVERSIONGT5 := $(shell expr `$(CC) -dumpversion | cut -f1 -d.` \> 5)
+GCCVERSIONGTEQ7 := $(shell expr `$(CC) -dumpversion | cut -f1 -d.` \>= 7)
+GCCVERSIONGTEQ9 := $(shell expr `$(CC) -dumpversion | cut -f1 -d.` \>= 9)
+GCCMINORVERSIONGTEQ7 := $(shell expr `$(CC) -dumpversion | cut -f2 -d.` \>= 7)
+endif
+
 #
 #  OS dependent settings
 #
@@ -323,13 +332,7 @@ ifeq ($(C_COMPILER), CLANG)
 CCOMMON_OPT	+= -DMS_ABI
 endif
 
-ifeq ($(C_COMPILER), GCC)
 #Version tests for supporting specific features (MS_ABI, POWER9 intrinsics)
-GCCVERSIONGTEQ4 := $(shell expr `$(CC) -dumpversion | cut -f1 -d.` \>= 4)
-GCCVERSIONGT4 := $(shell expr `$(CC) -dumpversion | cut -f1 -d.` \> 4)
-GCCVERSIONGTEQ7 := $(shell expr `$(CC) -dumpversion | cut -f1 -d.` \>= 7)
-GCCVERSIONGTEQ9 := $(shell expr `$(CC) -dumpversion | cut -f1 -d.` \>= 9)
-GCCMINORVERSIONGTEQ7 := $(shell expr `$(CC) -dumpversion | cut -f2 -d.` \>= 7)
 ifeq ($(GCCVERSIONGT4), 1)
 # GCC Major version > 4
 # It is compatible with MSVC ABI.
@@ -343,7 +346,6 @@ ifeq ($(GCCMINORVERSIONGTEQ7), 1)
 CCOMMON_OPT	+= -DMS_ABI
 endif
 endif
-endif
 
 # Ensure the correct stack alignment on Win32
 # http://permalink.gmane.org/gmane.comp.lib.openblas.general/97