From a65ec44779ab2c01ba937b40496ca648626d0308 Mon Sep 17 00:00:00 2001 From: Miguel Ojeda Date: Sat, 17 Dec 2022 02:50:08 +0100 Subject: Add `-Zno-jump-tables` This flag mimics GCC/Clang's `-fno-jump-tables` [1][2], which makes the codegen backend avoid generating jump tables when lowering switches. In the case of LLVM, the `"no-jump-tables"="true"` function attribute is added to every function. The kernel currently needs it for x86 when enabling IBT [3], as well as for Alpha (plus VDSO objects in MIPS/LoongArch). [1] https://gcc.gnu.org/onlinedocs/gcc/Code-Gen-Options.html#index-fno-jump-tables [2] https://clang.llvm.org/docs/ClangCommandLineReference.html#cmdoption-clang-fjump-tables [3] https://github.com/torvalds/linux/blob/v6.1/arch/x86/Makefile#L75-L83 Signed-off-by: Miguel Ojeda --- compiler/rustc_interface/src/tests.rs | 1 + 1 file changed, 1 insertion(+) (limited to 'compiler/rustc_interface/src') diff --git a/compiler/rustc_interface/src/tests.rs b/compiler/rustc_interface/src/tests.rs index e903cb86dd2..ff2196d5857 100644 --- a/compiler/rustc_interface/src/tests.rs +++ b/compiler/rustc_interface/src/tests.rs @@ -754,6 +754,7 @@ fn test_unstable_options_tracking_hash() { tracked!(move_size_limit, Some(4096)); tracked!(mutable_noalias, Some(true)); tracked!(no_generate_arange_section, true); + tracked!(no_jump_tables, true); tracked!(no_link, true); tracked!(no_profiler_runtime, true); tracked!(no_unique_section_names, true); -- cgit 1.4.1-3-g733a5