[Bug c/101261] New: clones for target_clones attribute cannot be created when compilling with -fno-semantic-interposition

["johnnybit at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101261

            Bug ID: 101261
           Summary: clones for target_clones attribute cannot be created
                    when compilling with -fno-semantic-interposition
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: johnnybit at gmail dot com
  Target Milestone: ---

darktable's user reported problem building darktable with "optimized" flags and
I could confirm the error is present on GCC 10.3.0

When compilling whole darktable with CFLAGS set to 
`-march=native -O3 -fno-semantic-interposition -flto=3 -fno-plt
-fgraphite-identity -floop-nest-optimize -fuse-linker-plugin -pipe -Wl,-O1
-Wl,--as-needed`

the compiler errors with:

src/common/iop_profile.c:1015:6: error: clones for «target_clones» attribute
cannot be created
 1015 | void dt_ioppr_transform_image_colorspace(struct dt_iop_module_t *self,
const float *const image_in,
      |      ^

I've managed to narrow it down and it was enough to just set the
-fno-semantic-interposition flag to make darktable compillation error out on
the same point.

I haven't been able to create minimum reproducer for this problem (single file
project compiles and runs ok)

for details please check https://github.com/darktable-org/darktable/issues/9303