https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116007
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
To build libquadmath on powerpc*, one needs --with-long-double-128 (and perhaps
--with-long-double-format=ieee if C library supports that), unless that is
detected automatically.
# Check if TFmode long double should be used by default or not.
# Some glibc targets used DFmode long double, but with glibc 2.4
# and later they can use TFmode.
case "$target" in
powerpc*-*-linux* | \
sparc*-*-linux* | \
s390*-*-linux* | \
alpha*-*-linux*)
AC_ARG_WITH(long-double-128,
[AS_HELP_STRING([--with-long-double-128],
[use 128-bit long double by default])],
gcc_cv_target_ldbl128="$with_long_double_128", [
case "$target" in
s390*-*-linux-musl*)
gcc_cv_target_ldbl128=yes
;;
powerpc*-*-linux-musl*)
gcc_cv_target_ldbl128=no
;;
*)]
[GCC_GLIBC_VERSION_GTE_IFELSE([2], [4], [gcc_cv_target_ldbl128=yes], [
[gcc_cv_target_ldbl128=no
grep '^[ ]*#[ ]*define[ ][ ]*__LONG_DOUBLE_MATH_OPTIONAL'
\
$target_header_dir/bits/wordsize.h > /dev/null 2>&1 \
&& gcc_cv_target_ldbl128=yes
]])]
[
;;
esac
])
;;
esac
>From thbis, it seems powerpc musl likely doesn't have neither double double nor
IEEE quad support and so in that case you can't use --enable-libquadmath
--enable-libquadmath-support.
