On Wed, Oct 21, 2020 at 9:48 PM William Tambe <tambewilliam@xxxxxxxxx> wrote: > > On Wed, Oct 21, 2020 at 6:36 PM Jim Wilson <jimw@xxxxxxxxxx> wrote: > > > > On Wed, Oct 21, 2020 at 1:27 PM William Tambe via Gcc-help <gcc-help@xxxxxxxxxxx> wrote: > >> > >> For a specific platform, what is the proper way to enable the floating > >> point emulation routines described at ? > >> https://gcc.gnu.org/onlinedocs/gccint/Soft-float-library-routines.html#Soft-float-library-routines > > > > > > In libgcc/config.host, add one of the t-softfp* files to tmake_file for your host. There are a number of choices, depending on exactly which modes you need support for, and exactly which modes are implemented in hardware. E.g. a target with no FP hardware and no 128-bit long double needs only soft-float sf and df. A target with FP hardware that supports 32-bit float only, and supports 128-bit long double, needs soft-float df and tf. Etc. See the various target independent and target dependent t-softfp files and pick one that matches your situation. > > In libgcc/config.host we currently have: > tmake_file="${tmake_file} t-softfp-sfdf t-softfp-excl t-softfp" I ended up using: tmake_file="${tmake_file} t-fpbit" and it worked. What is the difference between t-fpbit and t-softfp* ? > > However, compiling a program that uses __mulsf3() throws the following error: > error: implicit declaration of function ‘__mulsf3’; did you mean > ‘__mulsc3’? [-Werror=implicit-function-declaration] > > Compilation is done using -nostdlib -lgcc > > Any idea what else is missing ? > > > > > Jim > >
