[PATCH][stage2 project] Sub-Target specific math routines library

[Paolo Bonzini]

>>The patch almost satisfies me (see below), but you'd need a build
>>machinery maintainer approval for the configury bits.

I cannot approve it, but I will comment on a few bits that can be improved.

>>| + # Set the default so we build libgcc-math for ix86 and x86_64
>>| + case "${target}" in
>>| +   i?86-*)
>>| +     libgccmdefault=yes ;;
>>| +   x86_64-*)
>>| +     libgccmdefault=yes ;;
>>| +   *)
>>| +     libgccmdefault=no ;;
>>
>>s/libgccmdefault/libgcc_mathdefault/?
> 
> Ok.

Since you are at it, libgcc_mathdefault.  Or you could sink it into the 
AC_ARG_ENABLE macro, and set enable_libgcc_math directly.

>>| + esac
>>| + AC_ARG_ENABLE(libgcc-math,
>>| + [  --enable-libgcc-math   Builds libgcc-math directory],
>>| + ENABLE_LIBGCCM=$enableval,
>>| + ENABLE_LIBGCCM=$libgccmdefault)
>>
>>s/LIBGCCM/LIBGCC_MATH/?
> 
> Ok.  (They are just local shell temps, but for consistency I'll change 
> them)

No need.  Just do

AC_ARG_ENABLE(libgcc-math,
[  --enable-libgcc-math   Builds libgcc-math directory],,
enable_libgcc_math=$libgcc_math_default)

... because configure already copies the argument from $enableval into 
$enable_libgcc_math.  In fact AC_ARG_ENABLE is mostly useful to set a 
default and to provide a help string.

Paolo