I want to use the gcc builtin __builtin_popcount() inside my program if, and only if, the program is compiled with the option -mpopcnt. This is because I see that calling __builtin_popcount() when the program is not compiled with option -mpopcnt is actually slower than doing the popcnt() computation myself. So I was hoping that there is a way to test whether a compilation option is present in the preprocessor. Anyone know the answer? -- View this message in context: http://gcc.1065356.n5.nabble.com/Check-for-command-line-option-in-my-header-file-tp1282119.html Sent from the gcc - Help mailing list archive at Nabble.com.
