[Bug ipa/114930] New: ICE in fld_incomplete_type_of when building libwebp with -std=c23 -flto

["sjames at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114930

            Bug ID: 114930
           Summary: ICE in fld_incomplete_type_of when building libwebp
                    with -std=c23 -flto
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: ipa
          Assignee: unassigned at gcc dot gnu.org
          Reporter: sjames at gcc dot gnu.org
  Target Milestone: ---

Created attachment 58093
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=58093&action=edit
libwebpdecode_la-vp8l_dec.i.xz

```
$ gcc -c libwebpdecode_la-vp8l_dec.i -std=c23 -flto
/var/tmp/portage/media-libs/libwebp-1.3.2/work/libwebp-1.3.2/src/dec/vp8l_dec.c:
In function ‘CopySmallPattern8b’:
/var/tmp/portage/media-libs/libwebp-1.3.2/work/libwebp-1.3.2/src/dec/vp8l_dec.c:908:10:
warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
  908 |   while ((uintptr_t)dst & 3) {
      |          ^
/var/tmp/portage/media-libs/libwebp-1.3.2/work/libwebp-1.3.2/src/dec/vp8l_dec.c:
In function ‘CopySmallPattern32b’:
/var/tmp/portage/media-libs/libwebp-1.3.2/work/libwebp-1.3.2/src/dec/vp8l_dec.c:977:7:
warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
  977 |   if ((uintptr_t)dst & 4) {           // Align 'dst' to 8-bytes
boundary.
      |       ^
/var/tmp/portage/media-libs/libwebp-1.3.2/work/libwebp-1.3.2/src/dec/vp8l_dec.c:
In function ‘CopyBlock32b’:
/var/tmp/portage/media-libs/libwebp-1.3.2/work/libwebp-1.3.2/src/dec/vp8l_dec.c:994:36:
warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
  994 |   if (dist <= 2 && length >= 4 && ((uintptr_t)dst & 3) == 0) {
      |                                    ^
during IPA pass: *free_lang_data
/var/tmp/portage/media-libs/libwebp-1.3.2/work/libwebp-1.3.2/src/dec/vp8l_dec.c:
At top level:
/var/tmp/portage/media-libs/libwebp-1.3.2/work/libwebp-1.3.2/src/dec/vp8l_dec.c:1744:1:
internal compiler error: in fld_incomplete_type_of, at
ipa-free-lang-data.cc:257
 1744 | }
      | ^
0x5564762f6448 fld_incomplete_type_of
       
/usr/src/debug/sys-devel/gcc-14.0.1_pre20240430/gcc-14.1.0-RC-20240430/gcc/ipa-free-lang-data.cc:257
0x5564778ff8fd fld_simplified_type
       
/usr/src/debug/sys-devel/gcc-14.0.1_pre20240430/gcc-14.1.0-RC-20240430/gcc/ipa-free-lang-data.cc:344
0x5564778ff8fd free_lang_data_in_type
       
/usr/src/debug/sys-devel/gcc-14.0.1_pre20240430/gcc-14.1.0-RC-20240430/gcc/ipa-free-lang-data.cc:439
0x556477fd53b0 free_lang_data_in_cgraph
       
/usr/src/debug/sys-devel/gcc-14.0.1_pre20240430/gcc-14.1.0-RC-20240430/gcc/ipa-free-lang-data.cc:1072
0x556477fd53b0 free_lang_data
       
/usr/src/debug/sys-devel/gcc-14.0.1_pre20240430/gcc-14.1.0-RC-20240430/gcc/ipa-free-lang-data.cc:1109
0x556477fd53b0 execute
       
/usr/src/debug/sys-devel/gcc-14.0.1_pre20240430/gcc-14.1.0-RC-20240430/gcc/ipa-free-lang-data.cc:1176
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://bugs.gentoo.org/> for instructions.
```