Re: About GSOC.

[Tejas Joshi <tejasjoshi9673 at gmail dot com>]

> 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 <joseph@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
> joseph@codesourcery.com