I'm compiling an app for a device where the architecture does not support sse beyond sse2, and was wondering is it possible to disable compiling with sse3 instructions from GNU autoconf generated configure scripts? I know you can turn it off in gcc/g++ with mno-sse3 option, but it would be nice if I could turn it off at the configuration level rather than generating a make file and then manually inserting that compiler flag...
Compiling a gnu program without sse3
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If you are using the more recent versions of gcc, you can simply do -march=native, and the compiler will handle it for you.
Edit: this option was introduced in gcc 4.2.
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Sure. Just set the required flags before calling configure:
You might want to try -march if -mtune does the wrong thing, I haven't tested this lately.