[Bug c/120381] [14/15/16 Regression] internal compiler error: in composite_type_internal, at c/c-typeck.cc:848
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120381 --- Comment #6 from GCC Commits --- The master branch has been updated by Martin Uecker : https://gcc.gnu.org/g:0e0f963bcfbfce351dd4aad82e6dbc6fc84a0724 commit r16-982-g0e0f963bcfbfce351dd4aad82e6dbc6fc84a0724 Author: Martin Uecker Date: Thu May 29 19:13:46 2025 +0200 c: fix ICE for mutually recursive structures [PR120381] For invalid nesting of a structure definition in a definition of itself or when using a rather obscure construction using statement expressions, we can create mutually recursive pairs of non-identical but compatible structure types. This can lead to invalid composite types and an ICE. If we detect recursion even for swapped pairs when forming composite types, this is avoided. PR c/120381 gcc/c/ChangeLog: * c-typeck.cc (composite_type_internal): Stop recursion for swapped pairs. gcc/testsuite/ChangeLog: * gcc.dg/pr120381.c: New test. * gcc.dg/gnu23-tag-composite-6.c: New test.
[Bug c/120381] [14/15/16 Regression] internal compiler error: in composite_type_internal, at c/c-typeck.cc:848
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120381 --- Comment #5 from uecker at gcc dot gnu.org --- Turns out one can trigger this also using statement expressions: https://godbolt.org/z/3M8en31zd PATCH: https://gcc.gnu.org/pipermail/gcc-patches/2025-May/685119.html
[Bug c/120381] [14/15/16 Regression] internal compiler error: in composite_type_internal, at c/c-typeck.cc:848
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120381 --- Comment #4 from uecker at gcc dot gnu.org --- Created attachment 61548 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=61548&action=edit patch for trunk
[Bug c/120381] [14/15/16 Regression] internal compiler error: in composite_type_internal, at c/c-typeck.cc:848
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120381 Richard Biener changed: What|Removed |Added Target Milestone|14.3|14.4 --- Comment #3 from Richard Biener --- GCC 14.3 is being released, retargeting bugs to GCC 14.4.
[Bug c/120381] [14/15/16 Regression] internal compiler error: in composite_type_internal, at c/c-typeck.cc:848
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120381 Richard Biener changed: What|Removed |Added Priority|P3 |P4
[Bug c/120381] [14/15/16 Regression] internal compiler error: in composite_type_internal, at c/c-typeck.cc:848
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120381 --- Comment #2 from Joseph S. Myers --- Nesting one definition of struct A inside another is never valid (and the godbolt link shows the expected "nested redefinition" error that the PR doesn't quote).
[Bug c/120381] [14/15/16 Regression] internal compiler error: in composite_type_internal, at c/c-typeck.cc:848
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120381 Andrew Pinski changed: What|Removed |Added Summary|internal compiler error: in |[14/15/16 Regression] |composite_type_internal, at |internal compiler error: in |c/c-typeck.cc:848 |composite_type_internal, at ||c/c-typeck.cc:848 Target Milestone|--- |14.3
