Makefile和automake中判斷CPU位數

 

Makefile中: cpu_bit=$(shell getconf LONG_BIT) ifeq ($(cpu_bit),64)     MY_CXXFLAGS= else     MY_CXXFLAGS=-march=pentium4 endif x::         @echo $(cpu_bit)         @echo $(MY_CXXFLAGS) automake中要稍複雜些: 首先要在configure.ac文件中添加一行: AM_CONDITIONAL(bit_32,test "x`getconf LONG_BIT`"="x32") 而後再在Makefile.am文件中添加: if bit_32     MY_CXXFLAGS=-march=pentium4 else     MY_CXXFLAGS= endif 這樣就能夠了.