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fbc: add ARM hard float cpu/arch options
- add FB_CPUTYPE_ARMV6_FP for -march=armv6+fp - add FB_CPUTYPE_ARMV7A_FP for -march=armv7-a+fp - starting with gcc 8 -march accepts '+fp' feature specifier, however appears that on some platforms since porting fbc to ARM, gcc has been configured to have hard-float by default even if only -march=armv6|armv7-a was passed to gcc - and this appears to have change in at least debian 12 / gcc 12 hard-float is not implicitly enabled if only -march=armv6|armv7-a was passed example: fbc -arch=armv6 ... fbc -arch=armv6+fp ... fbc -arch=armv7-a ... fbc -arch=armv7-a+fp ...
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