On 03/12/20 20:07 -0300, Tulio Magno Quites Machado Filho via Libstdc++ wrote:
Jonathan Wakely via Libstdc++ <libstd...@gcc.gnu.org> writes:diff --git a/libstdc++-v3/configure.ac b/libstdc++-v3/configure.ac index cbfdf4c6bad..d25842fef35 100644 --- a/libstdc++-v3/configure.ac +++ b/libstdc++-v3/configure.ac @@ -421,12 +425,43 @@ case "$target" in port_specific_symbol_files="\$(top_srcdir)/config/os/gnu-linux/ldbl-extra.ver" case "$target" in powerpc*-*-linux*) - LONG_DOUBLE_COMPAT_FLAGS="$LONG_DOUBLE_COMPAT_FLAGS -mno-gnu-attribute" ;; + LONG_DOUBLE_COMPAT_FLAGS="$LONG_DOUBLE_COMPAT_FLAGS -mno-gnu-attribute" + # Check for IEEE128 support in libm: + AC_CHECK_LIB(m, frexpf128,I suggest to replace frexpf128 with __frexpieee128. The former is available on a glibc that support _Float128 (since glibc 2.26). The later is available on a glibc that supports binary128 long double (since glibc 2.32)
Hmm, yes, you pointed me to __frexpieee128 a few months ago, but for some reason I either didn't switch to using it, or lost a patch when squashing and rebasing branches. Hopefully I just forgot to change it, but I'll double check to make sure I haven't left any work on an old branch. Thanks for suggesting it (again!)
Without this modification, the build fails on glibc between 2.26 and 2.31. I'm also running a couple of tests here. I believe this is showing a couple of glitches in glibc which I'm already investigating. Thanks! -- Tulio Magno
