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Diffstat (limited to 'compiler/rustc_codegen_gcc/doc/debugging.md')
| -rw-r--r-- | compiler/rustc_codegen_gcc/doc/debugging.md | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/compiler/rustc_codegen_gcc/doc/debugging.md b/compiler/rustc_codegen_gcc/doc/debugging.md new file mode 100644 index 00000000000..6ff4edf8877 --- /dev/null +++ b/compiler/rustc_codegen_gcc/doc/debugging.md @@ -0,0 +1,38 @@ +# Debugging + +## How to debug GCC LTO + +Run do the command with `-v -save-temps` and then extract the `lto1` line from the output and run that under the debugger. + +## How to debug stdarch tests that cannot be ran locally + +First, run the tests normally: + +---- +cd build/build_sysroot/sysroot_src/library/stdarch/ +STDARCH_TEST_EVERYTHING=1 CARGO_TARGET_X86_64_UNKNOWN_LINUX_GNU_RUNNER="sde -future -rtm_mode full --" TARGET=x86_64-unknown-linux-gnu ../../../../../y.sh cargo test +---- + +It will show the command it ran, something like this: + +---- + process didn't exit successfully: `sde -future -rtm_mode full -- /home/user/projects/rustc_codegen_gcc/build/build_sysroot/sysroot_src/library/stdarch/target/debug/deps/core_arch-fd2d75f89baae5c6` (signal: 11, SIGSEGV: invalid memory reference) +---- + +Then add the `-debug` flag to it: + +---- +sde -debug -future -rtm_mode full -- /home/user/projects/rustc_codegen_gcc/build/build_sysroot/sysroot_src/library/stdarch/target/debug/deps/core_arch-fd2d75f89baae5c6 +---- + +To see the symbols in `gdb`, specify the executable in your command: + +---- +gdb /home/user/projects/rustc_codegen_gcc/build/build_sysroot/sysroot_src/library/stdarch/target/debug/deps/core_arch-fd2d75f89baae5c6 +---- + +and then write the `gdb` command that `sde` tells you to use, something like: + +---- +target remote :51299 +---- |