使用 gcc 4.7.2 和 autoconf 2.69 进行编译时，我经常会在 configure.log 中得到诸如此类的结果。例子：
configure:3091: $? = 0
configure:3080: gcc -V >&5
gcc: error: unrecognized command line option '-V'
gcc: fatal error: no input files compilation terminated.
configure:3091: $? = 1
configure:3080: gcc -qversion >&5
gcc: error: unrecognized command line option '-qversion'
gcc: fatal error: no input files compilation terminated.
configure:3091: $? = 1
configure:3111: checking whether the C compiler works
configure:3133: gcc -march=x86-64 -mtune=generic -Os -pipe -Wl,-O1 conftest.c >&5
configure:3137: $? = 0
configure:3185: …