risc-v: Disable PIC by default for now #430
Merged
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Rust's linker cannot currently handle gcc's fPIC compilation units
for RISC-V targets:
= note: rust-lld: error:
.got section detected in the input files. Dynamic relocations are not
supported. If you are linking to C code compiled using the `gcc` crate
then modify your build script to compile the C code _without_ the
-fPIC flag. See the documentation of the `gcc::Config.fpic` method for
details.
So disable PIC by default for now for `riscv` targets.
Centril
added a commit
to Centril/rust
that referenced
this pull request
Nov 15, 2019
Update cc, git2, num_cpus. This updates the `cc` crate, bringing in better parallel building support. Also updates `git2` which enables the parallel feature. (Note: I don't expect it will have a significant impact on build time, but seems good to update anyways.) The main thorn is that `cc` gained knowledge about RISC-V architectures (rust-lang/cc-rs#428, rust-lang/cc-rs#429, rust-lang/cc-rs#430), but the builders on CI do not have the riscv C compiler installed. This means that bootstraps' cc detection was finding a C compiler that isn't installed, and fails. The solution here is to override the cc detection to `false`. The C compiler isn't actually used on riscv platforms. AFAIK, the only location would be compiler_builtins, and it currently forces C support off (https://github.com/rust-lang/compiler-builtins/blob/a533ae9c5aa325db209659679535fe1f186eae81/build.rs#L49-L55). Other possible solutions: - Add the override in cc_detect for riscv (or any "no-C" platform like wasm32 and nvptx) - Install and use the appropriate c compiler. I tried this the `g++-riscv64-linux-gnu` package, but it failed missing some header file. Closes rust-lang#66232
bors
added a commit
to rust-lang/rust
that referenced
this pull request
Nov 16, 2019
Update cc, git2, num_cpus. This updates the `cc` crate, bringing in better parallel building support. Also updates `git2` which enables the parallel feature. (Note: I don't expect it will have a significant impact on build time, but seems good to update anyways.) The main thorn is that `cc` gained knowledge about RISC-V architectures (rust-lang/cc-rs#428, rust-lang/cc-rs#429, rust-lang/cc-rs#430), but the builders on CI do not have the riscv C compiler installed. This means that bootstraps' cc detection was finding a C compiler that isn't installed, and fails. The solution here is to override the cc detection to `false`. The C compiler isn't actually used on riscv platforms. AFAIK, the only location would be compiler_builtins, and it currently forces C support off (https://github.com/rust-lang/compiler-builtins/blob/a533ae9c5aa325db209659679535fe1f186eae81/build.rs#L49-L55). Other possible solutions: - Add the override in cc_detect for riscv (or any "no-C" platform like wasm32 and nvptx) - Install and use the appropriate c compiler. I tried this the `g++-riscv64-linux-gnu` package, but it failed missing some header file. Closes #66232
# for free
to join this conversation on GitHub.
Already have an account?
# to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Rust's linker cannot currently handle gcc's fPIC compilation units
for RISC-V targets:
So disable PIC by default for now for
riscvtargets.