https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97653
--- Comment #19 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-10 branch has been updated by Jakub Jelinek <ja...@gcc.gnu.org>: https://gcc.gnu.org/g:8642b73a0f0df1f8e1e2d2102d67a76f8ed0a255 commit r10-9720-g8642b73a0f0df1f8e1e2d2102d67a76f8ed0a255 Author: Jakub Jelinek <ja...@redhat.com> Date: Sat Apr 3 10:05:32 2021 +0200 rs6000: Fix up libgcc ABI when built with --with-long-double-format=ieee [PR97653] __floatunditf and __fixtfdi and a couple of other libgcc{.a,_s.so} entrypoints for backwards compatibility should mean IBM double double handling (i.e. IFmode), gcc emits such calls for that format and form IEEE long double emits *kf* instead. When gcc is configured without --with-long-double-format=ieee , everything is fine, but when it is not, we need to compile those libgcc sources with -mno-gnu-attribute -mabi=ibmlongdouble. The following snippet in libgcc/config/rs6000/t-linux was attempting to ensure that, and for some routines it works fine (e.g. for _powitf2). But, due to 4 different types of bugs it doesn't work for most of those functions, which means that in --with-long-double-format=ieee configured gcc those *tf* entrypoints instead handle the long double arguments as if they were KFmode. The bugs are: 1) the first few objs properly use $(objext) as suffix, but several other contain a typo and use $(object) instead, which is a variable that isn't set to anything, so we don't add .o etc. extensions 2) while unsigned fix are properly called _fixuns*, unsigned float are called _floatun* (without s), but the var was using there the extra s and so didn't match 3) the variable didn't cover any of the TF <-> TI conversions, only TF <-> DI conversions 4) nothing in libgcc_s.so was handled, as those object files are called *_s.o rather than *.o and IBM128_SHARED_OBJS used wrong syntax of the GNU make substitution reference, which should be $(var:a=b) standing for $(patsubst a,b,$(var)) but it used $(var:a:b) instead 2021-04-03 Jakub Jelinek <ja...@redhat.com> PR target/97653 * config/rs6000/t-linux (IBM128_STATIC_OBJS): Fix spelling, use $(objext) instead of $(object). Use _floatunditf instead of _floatunsditf. Add tf <-> ti conversion objects. (IBM128_SHARED_OBJS): Use proper substitution reference syntax. (cherry picked from commit cda41ce0e8414aec59e6b9fbe645d96e6e8193e2)
