Added NO_PARALLEL_MAKE flag to disable parallel make.

Makefile.rule

@@ -81,6 +81,9 @@ VERSION = 0.2.6
 # and OS. However, the performance is low.
 # NO_AVX = 1
 
+# Don't use parallel make.
+# NO_PARALLEL_MAKE = 1
+
 # If you would like to know minute performance report of GotoBLAS.
 # FUNCTION_PROFILE = 1
 

Makefile.system

@@ -65,6 +65,10 @@ ifeq ($(DEBUG), 1)
 GETARCH_FLAGS	+= -g
 endif
 
+ifndef NO_PARALLEL_MAKE
+NO_PARALLEL_MAKE=0
+endif
+GETARCH_FLAGS	+= -DNO_PARALLEL_MAKE=$(NO_PARALLEL_MAKE)
 # This operation is expensive, so execution should be once.
 ifndef GOTOBLAS_MAKEFILE
 export GOTOBLAS_MAKEFILE = 1

getarch.c

@@ -804,8 +804,12 @@ int main(int argc, char *argv[]){
 #endif
 #endif
 
+#if NO_PARALLEL_MAKE==1
+    printf("MAKE += -j 1\n");
+#else
 #ifndef OS_WINDOWS
     printf("MAKE += -j %d\n", get_num_cores());
+#endif
 #endif
 
     break;