在makefile中,我想定义一个变量,指定当前的redhat-release是否大于5.3.(此变量将作为#define传递给gcc)
到目前为止,我想出了:
# Find out which version of Red-Hat we're running
RH_VER_NUM = $(shell /bin/grep -o [0-9].[0-9] /etc/redhat-release)
RH_GT_5_3 = $RH_VER_NUM > '5.3'
定义RH_GT_5_3的正确方法是什么？