https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110812
--- Comment #36 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-15 branch has been updated by Kito Cheng <[email protected]>: https://gcc.gnu.org/g:0efe904de8ce64e57db4c51e721f798ec3225b02 commit r15-10386-g0efe904de8ce64e57db4c51e721f798ec3225b02 Author: Kito Cheng <[email protected]> Date: Thu Jul 10 15:28:30 2025 +0800 RISC-V: Always register vector built-in functions during LTO [PR110812] Previously, vector built-in functions were not properly registered during the LTO pipeline, causing link failures when vector intrinsics were used in LTO builds with mixed architecture options. This patch ensures all vector built-in functions are always registered during LTO compilation. The key changes include: - Moving pragma intrinsic flag manipulation from riscv-c.cc to riscv-vector-builtins.cc for better encapsulation - Registering all vector built-in functions regardless of current ISA extensions, deferring the actual extension checking to expansion time - Adding proper support for built-in type registration during LTO This approach is safe because we already perform extension requirement checking at expansion time. The trade-off is a slight increase in bootstrap time for LTO builds due to registering more built-in functions. PR target/110812 gcc/ChangeLog: * config/riscv/riscv-c.cc (pragma_intrinsic_flags): Remove struct. (riscv_pragma_intrinsic_flags_pollute): Remove function. (riscv_pragma_intrinsic_flags_restore): Remove function. (riscv_pragma_intrinsic): Simplify to only call handle_pragma_vector. * config/riscv/riscv-vector-builtins.cc (pragma_intrinsic_flags): Move struct definition here from riscv-c.cc. (riscv_pragma_intrinsic_flags_pollute): Move and adapt from riscv-c.cc, add zvfbfmin, zvfhmin and vector_elen_bf_16 support. (riscv_pragma_intrinsic_flags_restore): Move from riscv-c.cc. (rvv_switcher::rvv_switcher): Add pollute_flags parameter to control flag manipulation. (rvv_switcher::~rvv_switcher): Restore flags conditionally. (register_builtin_types): Use rvv_switcher without polluting flags. (get_required_extensions): Remove function. (check_required_extensions): Simplify to only check type validity. (function_instance::function_returns_void_p): Move implementation from header. (function_builder::add_function): Register placeholder for LTO. (init_builtins): Simplify and handle LTO case. (reinit_builtins): Remove function. (handle_pragma_vector): Remove extension checking. * config/riscv/riscv-vector-builtins.h (function_instance::function_returns_void_p): Add declaration. (function_call_info::function_returns_void_p): Remove inline implementation. gcc/testsuite/ChangeLog: * gcc.target/riscv/lto/pr110812_0.c: New test. * gcc.target/riscv/lto/pr110812_1.c: New test. * gcc.target/riscv/lto/riscv-lto.exp: New test driver. * gcc.target/riscv/lto/riscv_vector.h: New header wrapper.
