[Bug target/108277] New: arm: error: generic thunk code fails with -march=armv8-m.base

[Bug target/108277] New: arm: error: generic thunk code fails with -march=armv8-m.base

[acoplan at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108277

            Bug ID: 108277
           Summary: arm: error: generic thunk code fails with
                    -march=armv8-m.base
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: acoplan at gcc dot gnu.org
  Target Milestone: ---

The test g++.dg/torture/pr81812.C is rejected with -march=armv8-m.base (but is
accepted with e.g. -march=armv8-m.main):

$ gcc/xgcc -B gcc -v
Reading specs from gcc/specs
COLLECT_GCC=gcc/xgcc
COLLECT_LTO_WRAPPER=gcc/lto-wrapper
Target: arm-eabi
Configured with: /home/alecop01/toolchain/src/gcc/configure
--prefix=/data_sdb/toolchain/cc1s/arm --enable-languages=c,c++
--disable-bootstrap --target=arm-eabi
Thread model: single
Supported LTO compression algorithms: zlib
gcc version 13.0.0 20230103 (experimental) (GCC)
$ gcc/xgcc -B gcc -c ~/toolchain/src/gcc/gcc/testsuite/g++.dg/torture/pr81812.C
-march=armv8-m.main
$ gcc/xgcc -B gcc -c ~/toolchain/src/gcc/gcc/testsuite/g++.dg/torture/pr81812.C
-march=armv8-m.base
/home/alecop01/toolchain/src/gcc/gcc/testsuite/g++.dg/torture/pr81812.C:6:8:
error: generic thunk code fails for method ‘virtual void
ChildNode::_ZTv0_n12_NK9ChildNode5errorEz(...) const’ which uses ‘...’
    6 |   void error(... ) const;
      |        ^~~~~

[Bug target/108277] arm: error: generic thunk code fails with -march=armv8-m.base

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108277

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2023-01-03
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Base is still thumb1 ...

define fgroup ARMv8m_base ARMv6m armv8 cmse tdiv

And this is why it is not implemented yet.

That is vcall_offset is non-zero and TARGET_THUMB1 is true.