Dear Yuri Tikhonov, In message <[email protected]> you wrote: > > When compile u-boot with the 2.18 binutils the following > warning messages for each object file in post/lib_ppc/fpu/ is > produced at the linking stage: > > post/libpost.a(acc1.o) uses hard float, u-boot uses soft-float > ... > > This is because of the fact that, in general, the soft-float and > hard-float ABIs are incompatible; the 2.18 binutils do checking > of the Tag_GNU_Power_ABI_FP attribute of the files to be linked, and > produce the worning like above if these are not compatible. > > The incompatibility of ABIs is concerned only the float values: > e.g. the soft-float ABI assumes the float argument passing in the > pair of rX registers, and the hard-float ABI assumes passing of > the float argument in the fX register. When we don't pass the float > arguments between the functions compiled with different floatness, > then such an application will work correctly. > This is the case for the FPU POST: u-boot (compiled with soft-float) > doesn't pass to (and doesn't get from) the FPU POST functions any > floats; there are no functions exported from the post/lib_ppc/fpu/ > objects which would work with float parameters/returns too. So, we > can reassure the linker not to worry about the difference in ABI > attributes of linking files just by setting the 'soft-float' > attribute for the objects in post/lib_ppc/fpu. And this patch does > this. > > Also, to avoid passing both soft- and hard-float options in CFLAGS > when compiling the files from post/lib_ppc/fpu (which is OK, but > looks rather dirty) this patch removes the soft-float string from > CFLAGS in post/lib_ppc/fpu/Makefile. > > Signed-off-by: Yuri Tikhonov <[email protected]> > --- > include/post.h | 13 +++++++++++++ > post/lib_ppc/fpu/20001122-1.c | 2 ++ > post/lib_ppc/fpu/20010114-2.c | 2 ++ > post/lib_ppc/fpu/20010226-1.c | 2 ++ > post/lib_ppc/fpu/980619-1.c | 2 ++ > post/lib_ppc/fpu/Makefile | 1 + > post/lib_ppc/fpu/acc1.c | 2 ++ > post/lib_ppc/fpu/compare-fp-1.c | 2 ++ > post/lib_ppc/fpu/fpu.c | 2 ++ > post/lib_ppc/fpu/mul-subnormal-single-1.c | 2 ++ > 10 files changed, 30 insertions(+), 0 deletions(-)
Applied, thanks. Best regards, Wolfgang Denk -- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: [email protected] It is much easier to suggest solutions when you know nothing _______________________________________________ U-Boot mailing list [email protected] http://lists.denx.de/mailman/listinfo/u-boot
