On Mon, Oct 19, 2020 at 03:12:13PM -0400, Michael Meissner wrote: > On Fri, Oct 16, 2020 at 02:14:04PM -0500, Segher Boessenkool wrote: > > On Thu, Sep 24, 2020 at 04:20:36PM -0400, Michael Meissner wrote: > > > You will need a new enough GLIBC in order to do this configuration. > > > > What happens if you glibc is older, and you try? > > You get linker errors due to the older GLIBC not using -mno-gnu-attribute in > all of the appropriate places, and and not all of the names that are renamed > will be present. > > -marlin-> ./xgcc -B./ -O2 -g foo.c -lm -mabi=ieeelongdouble -Wno-psabi && > ./a.out > /home3/meissner/fsf-install-ppc64le/binutils-gdb/bin/ld: > /opt/at13.0/lib/../lib64/libm.so uses IBM long double, > /home/meissner/tmp/gcc-tmp/ccvzdRyj.o uses IEEE long double > /home3/meissner/fsf-install-ppc64le/binutils-gdb/bin/ld: ./libgcc_s.so.1 uses > IBM long double, /home/meissner/tmp/gcc-tmp/ccvzdRyj.o uses IEEE long double > /home3/meissner/fsf-install-ppc64le/binutils-gdb/bin/ld: > /opt/at13.0/lib/../lib64/libc.so.6 uses IBM long double, > /home/meissner/tmp/gcc-tmp/ccvzdRyj.o uses IEEE long double > /home3/meissner/fsf-install-ppc64le/binutils-gdb/bin/ld: ./libgcc_s.so.1 uses > IBM long double, /home/meissner/tmp/gcc-tmp/ccvzdRyj.o uses IEEE long double > /home3/meissner/fsf-install-ppc64le/binutils-gdb/bin/ld: > /home/meissner/tmp/gcc-tmp/ccvzdRyj.o: in function `main': > /home3/meissner/fsf-build-ppc64le/work020-at13.0/gcc/foo.c:8: undefined > reference to `__sinieee128' > /home3/meissner/fsf-install-ppc64le/binutils-gdb/bin/ld: > /home3/meissner/fsf-build-ppc64le/work020-at13.0/gcc/foo.c:8: undefined > reference to `__printfieee128' > collect2: error: ld returned 1 exit status
So this requirement needs to be put in the release notes. It also is a regression, but I guess we will just have to live with that :-( Segher
