[Bug c++/110870] g++ internal compiler error on modules with precompiled headerfile "string"

[nshead at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110870

Nathaniel Shead <nshead at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2024-12-19
                 CC|                            |nshead at gcc dot gnu.org
             Blocks|                            |103524
             Status|UNCONFIRMED                 |NEW

--- Comment #3 from Nathaniel Shead <nshead at gcc dot gnu.org> ---
On current trunk the error is different, an ICE in binding_cmp.  Reduced:

  // header.hpp
  template <typename> struct X;
  template <typename T> X() -> X<T>;

  // a.cpp
  module;
  template <typename> struct X;
  using Y = X<char>;
  module M:part;
  import "header.hpp";
  Y *z;

  // b.cpp
  export module M;
  import :part;

$ g++ -fmodules -Wno-global-module -S header.hpp a.cpp b.cpp
b.cpp:1:8: internal compiler error: in binding_cmp, at cp/module.cc:13976
    1 | export module M;
      |        ^~~~~~
0x3cd9843 internal_error(char const*, ...)
        ../../gcc/gcc/diagnostic-global-context.cc:517
0x3ca4ecc fancy_abort(char const*, int, char const*)
        ../../gcc/gcc/diagnostic.cc:1704
0x111873d binding_cmp
        ../../gcc/gcc/cp/module.cc:13976
0x3d3f617 cmp1<sort_ctx>
        ../../gcc/gcc/sort.cc:151
0x3d3ef4f netsort<sort_ctx>
        ../../gcc/gcc/sort.cc:168
0x3d3e78e mergesort<sort_ctx>
        ../../gcc/gcc/sort.cc:205
0x3d3e45b gcc_qsort(void*, unsigned long, unsigned long, int (*)(void const*,
void const*))
        ../../gcc/gcc/sort.cc:268
0x1118e0c depset::hash::finalize_dependencies()
        ../../gcc/gcc/cp/module.cc:14060
0x11272e4 module_state::write_begin(elf_out*, cpp_reader*,
module_state_config&, unsigned int&)
        ../../gcc/gcc/cp/module.cc:18605
0x112ee96 finish_module_processing(cpp_reader*)
        ../../gcc/gcc/cp/module.cc:21076
0x104e39e c_parse_final_cleanups()
        ../../gcc/gcc/cp/decl2.cc:5542
0x143473d c_common_parse_file()
        ../../gcc/gcc/c-family/c-opts.cc:1407
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Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103524
[Bug 103524] [meta-bug] modules issue