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我gcc -march通过输入gcc --target-help命令获得帮助：

-march=CPU[,+EXTENSION...]
   generate code for CPU and EXTENSION, CPU is one of: i8086,
   i186, i286, i386, i486, pentium, pentiumpro, pentiumii,
   pentiumiii, pentium4, prescott, nocona, core, core2,
   corei7, l1om, k6, k6_2, athlon, k8, amdfam10, generic32,
   generic64 EXTENSION is combination of: 8087, 287, 387,
   no87, mmx, nommx, sse, sse2, sse3, ssse3, sse4.1, sse4.2,
   sse4, nosse, avx, noavx, vmx, smx, xsave, movbe, ept, aes,
   pclmul, fma, clflush, syscall, rdtscp, 3dnow, 3dnowa,
   sse4a, svme, abm, padlock, fma4, xop, lwp

我尝试设置-march=i686+nommxand -march=i686,+nommx，但它不正确！gcc报错：error: bad value (i686,+nommx) for -march= switch

我想将我的程序构建为i686没有mmx目标，如何设置-march选项？

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