> differ. (It's the unoptimized, stage1 cc1 that should be run under a > debugger. See <https://gcc.gnu.org/wiki/DebuggingGCC> for more details.)
Hello. I normally configure GCC by (as you told) /configure --enable-languages=c,c++ --disable-bootstrap --disable-multilib And further as told in <https://gcc.gnu.org/wiki/DebuggingGCC> make STAGE1_CXXFLAGS="-g -O0" all-stage1 but instead of -g to use -g3 is suggested for making macros debuggable and then use GDB. May I proceed the same? On Tue, 22 Jan 2019 at 04:33, Joseph Myers <jos...@codesourcery.com> wrote: > > On Tue, 22 Jan 2019, Tejas Joshi wrote: > > > the number like nan or normal in the functions. Though, attributes of > > struct real_value are pretty unclear to me regarding to the number it > > represents. (Am I right within this grasp?). > > It may be helpful to run the compiler under a debugger to examine how > particular real numbers are represented in real_value - that should help > answer questions such as what endianness is used for the significand, or > whether floating point values with a given exponent are in the range > [2^EXP, 2^(EXP+1)) or [2^(EXP-1), 2^EXP), where conventions commonly > differ. (It's the unoptimized, stage1 cc1 that should be run under a > debugger. See <https://gcc.gnu.org/wiki/DebuggingGCC> for more details.) > > And of course contribute comments in real.h once you've determined the > answers - because there are such areas where conventions about > representation of floating-point numbers commonly differ, it's > particularly valuable to have such comments because even someone familiar > with floating-point won't know which convention has been chosen by this > code in GCC. > > -- > Joseph S. Myers > jos...@codesourcery.com
