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868bdde25b
Make sure that compiler and linker don't optimize the section's contents away by adding the global holding the data to "llvm.used". The volatile load in the main shim is retained because "llvm.used", which translates to SHF_GNU_RETAIN on ELF targets, requires a reasonably recent linker; emitting the volatile load ensures compatibility with older linkers, at least when libstd is used. Pretty printers in dylib dependencies are now emitted by the main crate instead of the dylib; apart from matching how rlibs are handled, this approach has the advantage that `omit_gdb_pretty_printer_section` keeps working with dylib dependencies.
40 lines
792 B
Rust
40 lines
792 B
Rust
//
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//@ ignore-windows
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//@ ignore-apple
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//@ ignore-wasm
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//@ ignore-emscripten
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//@ compile-flags: -g -C no-prepopulate-passes -Cpanic=abort
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#![feature(lang_items)]
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#![no_std]
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// CHECK: @llvm.used = {{.+}} @__rustc_debug_gdb_scripts_section
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#[panic_handler]
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fn panic_handler(_: &core::panic::PanicInfo) -> ! {
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loop {}
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}
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#[no_mangle]
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extern "C" fn rust_eh_personality() {
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loop {}
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}
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// Needs rustc to generate `main` as that's where the magic load is inserted.
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// IOW, we cannot write this test with `#![no_main]`.
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// CHECK-LABEL: @main
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// CHECK: load volatile i8, {{.+}} @__rustc_debug_gdb_scripts_section
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#[lang = "start"]
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fn lang_start<T: 'static>(
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_main: fn() -> T,
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_argc: isize,
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_argv: *const *const u8,
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_sigpipe: u8,
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) -> isize {
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return 0;
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}
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fn main() {}
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