ICE when building tree-sitter@0.25.10 (libgccjit.so: error: : bitcast with types of different sizes)

[thesamesam]

From https://github.com/pkgcraft/pkgcraft:

~/git/pkgcraft $ cargo build
Compiling scallop v0.0.28 (/home/sam/git/pkgcraft/crates/scallop)
Compiling tree-sitter v0.25.10
[...]
libgccjit.so: error: : bitcast with types of different sizes
input expression (size: 64):
 <addr_expr 0x7fecd3a0b240
    type <pointer_type 0x7fecd3fc9348
        type <array_type 0x7fecd3fc92a0 type <integer_type 0x7fece091e348 signed char>
            BLK
            size <integer_cst 0x7fecd3e167e0 constant 256>
            unit-size <integer_cst 0x7fecd3e168b8 constant 32>
            user align:64 warn_if_not_align:0 symtab:0 alias-set -1 canonical-type 0x7fecd3fc7888 domain <integer_type 0x7fecd3fc77e0>
            pointer_to_this <pointer_type 0x7fecd3fc9348>>
        unsigned DI
        size <integer_cst 0x7fecd3e16480 constant 64>
        unit-size <integer_cst 0x7fecd3e16498 constant 8>
        align:64 warn_if_not_align:0 symtab:0 alias-set -1 canonical-type 0x7fecd3fc7a80>
    visited
    arg:0 <var_decl 0x7fecd3a07c78 stack_var_1 type <array_type 0x7fecd3fc92a0>
        addressable visited BLK (null):0:0 size <integer_cst 0x7fecd3e167e0 256> unit-size <integer_cst 0x7fecd3e168b8 32>
        align:64 warn_if_not_align:0 context <function_decl 0x7fecd3d90100 _ZN11tree_sitter10TreeCursor5reset17hd27b4d0f0af69267E>>>
requested type (size: 256):
 <record_type 0x7fecd3f9fa80  BLK
    size <integer_cst 0x7fecd3e167e0 type <integer_type 0x7fece091e0a8 bitsizetype> constant 256>
    unit-size <integer_cst 0x7fecd3e168b8 type <integer_type 0x7fece091e000 sizetype> constant 32>
    user align:64 warn_if_not_align:0 symtab:0 alias-set -1 canonical-type 0x7fecd3f9fa80
    fields <field_decl 0x7fecd3fa0460 field_0
        type <array_type 0x7fecd3f9f540 type <integer_type 0x7fecd3f9bd20 int>
            BLK
            size <integer_cst 0x7fecd3e164f8 constant 0>
            unit-size <integer_cst 0x7fecd3e164b0 constant 0>
            user align:32 warn_if_not_align:0 symtab:0 alias-set -1 canonical-type 0x7fecd3f9f5e8 domain <integer_type 0x7fecd3f9f1f8>>
        BLK (null):0:0 size <integer_cst 0x7fecd3e164f8 0> unit-size <integer_cst 0x7fecd3e164b0 0>
        user align:32 warn_if_not_align:0 offset_align 256 decl_not_flexarray: 0 offset <integer_cst 0x7fecd3e164b0 0> bit-offset <integer_cst 0x7fecd3e164f8 0> context <record_type 0x7fecd3f9fa80 >
        chain <field_decl 0x7fecd3fa0500 field_1 type <array_type 0x7fecd3f9fdc8>
            TI (null):0:0
            size <integer_cst 0x7fecd3e164c8 constant 128>
            unit-size <integer_cst 0x7fecd3e164e0 constant 16>
            user align:32 warn_if_not_align:0 offset_align 256 decl_not_flexarray: 0 offset <integer_cst 0x7fecd3e164b0 0> bit-offset <integer_cst 0x7fecd3e164f8 0> context <record_type 0x7fecd3f9fa80 > chain <field_decl 0x7fecd3fa05a0 field_2>>>
    pointer_to_this <pointer_type 0x7fecd3fa61f8>>
error: failed to build archive at `/home/sam/git/pkgcraft/target/debug/deps/libtree_sitter-0d20b34fde8c980b.rlib`: failed to open object file: No such file or directory (os error 2)

$ rustc -vV
rustc 1.91.0-nightly (067965d6c 2025-10-27) (gentoo)
binary: rustc
commit-hash: 067965d6cc76bfd49637f46d05ae2111bbd2f121
commit-date: 2025-10-27
host: x86_64-unknown-linux-gnu
release: 1.91.0-nightly

This is with the rust 1.91.0 beta from 20251009 and github.com/rust-lang/rust from b93730ce97c738bdb9209aa973d3fc6fd4ce1d81.

[antoyo]

This might be the same as #711.

[thesamesam]

This also shows up when building sys-devel/gcc (gccrs) in the ffi-polonius@0.1.0 crate.