[Bug target/102347] "fatal error: target specific builtin not available" with MMA and LTO

[rguenther at suse dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102347

--- Comment #10 from rguenther at suse dot de <rguenther at suse dot de> ---
On Thu, 23 Sep 2021, linkw at gcc dot gnu.org wrote:

> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102347
> 
> --- Comment #9 from Kewen Lin <linkw at gcc dot gnu.org> ---
> (In reply to Peter Bergner from comment #7)
> > (In reply to Martin Liška from comment #6)
> > > Quickly looking at the rs6000 code, it fails here:
> > > 
> > > #1  0x0000000011a0993c in rs6000_invalid_builtin
> > > (fncode=MMA_BUILTIN_DISASSEMBLE_ACC_INTERNAL) at
> > > ../../gcc/config/rs6000/rs6000-call.c:11643
> > > #2  0x0000000011a13134 in rs6000_builtin_decl (code=1603, initialize_p=true)
> > > at ../../gcc/config/rs6000/rs6000-call.c:13870
> > > #3  0x00000000115c3900 in unpack_ts_function_decl_value_fields
> > > (bp=0x3fffffffe2f0, expr=0x3fffaf195700) at ../../gcc/tree-streamer-in.c:361
> > > #4  0x00000000115c4790 in streamer_read_tree_bitfields (ib=0x3fffffffe6a0,
> > > data_in=0x132d1910, expr=0x3fffaf195700) at ../../gcc/tree-streamer-in.c:528
> > > #5  0x0000000010deaa28 in lto_read_tree_1 (ib=0x3fffffffe6a0,
> > > data_in=0x132d1910, expr=0x3fffaf195700) at ../../gcc/lto-streamer-in.c:1697
> > > 
> > > which relies on rs6000_builtin_mask. Note the mask is set here:
> > > rs6000_builtin_mask = rs6000_builtin_mask_calculate ();
> > > 
> > > where rs6000_builtin_mask_calculate is based on TARGET_* values.

Yeah, that's not going to work - if there are different builtin
decls for different flags then you have to use different BUILT_IN_*
codes as well.