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rust-embedded / embedonomicon

How to bootstrap support for a no_std target
https://docs.rust-embedded.org/embedonomicon/
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Link error in memory layout example #50

Closed austinglaser closed 4 years ago

austinglaser commented 4 years ago

With link.x as specified in the book, cargo rustc -- -C link-arg=-Tlink.x produces

   Compiling no_std_app v0.1.0 (/home/austin/repos/personal/no_std_experiment)
error: linking with `rust-lld` failed: exit code: 1
  |
  = note: "rust-lld" "-flavor" "gnu" "-L" "/home/austin/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/thumbv7m-none-eabi/lib" "/home/austin/repos/personal/no_std_experiment/target/thumbv7m-none-eabi/debug/deps/no_std_app-1e7c0fdb8e33f523.2ohn928r55zfdn1z.rcgu.o" "-o" "/home/austin/repos/personal/no_std_experiment/target/thumbv7m-none-eabi/debug/deps/no_std_app-1e7c0fdb8e33f523" "--gc-sections" "-L" "/home/austin/repos/personal/no_std_experiment/target/thumbv7m-none-eabi/debug/deps" "-L" "/home/austin/repos/personal/no_std_experiment/target/debug/deps" "-L" "/home/austin/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/thumbv7m-none-eabi/lib" "-Bstatic" "/home/austin/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/thumbv7m-none-eabi/lib/librustc_std_workspace_core-9864ecb2f3ae85f5.rlib" "/home/austin/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/thumbv7m-none-eabi/lib/libcore-a54bcae7919f0f3f.rlib" "/home/austin/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/thumbv7m-none-eabi/lib/libcompiler_builtins-a509ea259a1bcbbf.rlib" "-Tlink.x" "-Bdynamic"
  = note: rust-lld: error: no memory region specified for section '.ARM.exidx'

error: aborting due to previous error

error: could not compile `no_std_app`.

To learn more, run the command again with --verbose.

This can be fixed by adding a bar .arm.exidx to the /DISCARD/ section of the script.